pgfplots-features — Announcements of new releases

[Pgfplots-features] pgfplots externalize question

[Kasra F. <kas...@gm...>]

Hi All,

I'm using \tikzexternalize option of pgfplots and I have \addplot gnuplot
in my code which generates a table and I use the table command for showing
the errorbars of the plot, however, I explicitly provide the name of the
table file created by gnuplot. But with \tikzexternalize the figure# is
also appended to the name of the generated table file so how can I input
that into the name of the table file I provide? because if the figure
number is changed I have to go and manually change that name but there
should be a way that pgfplots take care of it, is there any trick to that?

the table file name is : jobname.pgf-plots.figure1.table

How can I replace figure1 part which can adapt itself if I add a figure
before that and it becomes figure2? right now I have to go into the code
and change it to figure2 manually.

I appreciate any help.

Cheers,
Kasra.

Re: [Pgfplots-features] tikzexternalize problem with lualatex

[Christian F. <cfe...@go...>]

Hi Kasra,

I debugged into the problem and found that

\tikzexternalcheckshellescape

does NOT expand to '-shell-escape'.

It smells like a bug in the external library... I will take care of it.

The purpose of the \tikzexternalcheckshellescape macro was to expand to 
the shell-escape argument if and only if it was present on the command 
line. To this end, it relies on some pdftex macro - which appears to be 
undefined for lualatex.

The immediate solution would be to use '-shell-escape' instead of 
'\tikzexternalcheckshellescape', i.e.

\tikzset{external/system call={lualatex -shell-escape -halt-on-error 
-interaction=batchmode -jobname "\image" "\texsource"}}

In that case, the argument 'external/shell escape' is ignored (it is 
only used by \tikzexternalcheckshellescape).

Kind regards

Christian


Am 28.06.2013 07:28, schrieb Kasra Fattah:
> Hi All,
>
> I'm using gnuplot in my pgfplots and I want to use \tikzexternalize. I 
> have attached a simple code to describe the problem. When I use 
> pdflatex with -shell-escape everything goes smooth. But when I'm using 
> lualatex either it complains about not having "1.pgf-plot.table" 
> available even the "1.pgf-plot.gnuplot" has been generated or it makes 
> a .table which has a problem and it cannot use it, however if after 
> the error I manually run "gnuplot 1.pgf-plot.gnuplot" to generate the 
> "1.pgf-plot.table"  and then recompile with lualatex -shell-escape, it 
> will go through and work fine. Do you know how I can resolve this 
> issue with lualatex? I appreciate any help.
>
> Cheers,
> Kasra.
>
>
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[Pgfplots-features] tikzexternalize problem with lualatex

[Kasra F. <kas...@gm...>]

Hi All,

"The body of my previous email was not showing so I resent it again. Sorry
about that."

I'm using gnuplot in my pgfplots and I want to use \tikzexternalize. When I
use pdflatex with -shell-escape everything goes smooth. But when I'm using
lualatex either it complains about not having "1.pgf-plot.table" available
even the "1.pgf-plot.gnuplot" has been generated or it makes a .table which
has a problem and it cannot use it, however if after the error I manually
run "gnuplot 1.pgf-plot.gnuplot" to generate the "1.pgf-plot.table"  and
then recompile with lualatex -shell-escape, it will go through and work
fine. Do you know how I can resolve this issue with lualatex? I appreciate
any help.

Cheers,
Kasra.

%%-------------------------tex code-------------------------------
\documentclass{article}
\usepackage{pgfplots}
\usepgfplotslibrary{external}
\tikzexternalize

\begin{document}

\begin{tikzpicture}
    \begin{axis}
        \addplot gnuplot{x};
    \end{axis}
\end{tikzpicture}

\end{document}

%%-----------------------error from log-----------------------------
.......
.......
(/usr/share/texlive/texmf-dist/tex/latex/latexconfig/epstopdf-sys.cfg
File: epstopdf-sys.cfg 2010/07/13 v1.3 Configuration of (r)epstopdf for TeX
Liv
e
))
===== 'mode=convert with system call': Invoking 'pdflatex -halt-on-error
-inter
action=batchmode -jobname "5-figure0"
"\def\tikzexternalrealjob{5}\input{5}"' =
=======
runsystem(pdflatex -halt-on-error -interaction=batchmode -jobname
"5-figure0" "
\def\tikzexternalrealjob{5}\input{5}")...executed.


! Package tikz Error: Sorry, the system call 'pdflatex -halt-on-error
-interact
ion=batchmode -jobname "5-figure0" "\def\tikzexternalrealjob{5}\input{5}"'
did
NOT result in a usable output file '5-figure0' (expected one of
.pdf:.jpg:.jpeg
:.png:). Please verify that you have enabled system calls. For pdflatex,
this i
s 'pdflatex -shell-escape'. Sometimes it is also named 'write 18' or
something
like that. Or maybe the command simply failed? Error messages can be found
in '
5-figure0.log'. If you continue now, I'll try to typeset the picture.

See the tikz package documentation for explanation.
Type  H <return>  for immediate help.
 ...

l.17 \end{tikzpicture}

?
! Interruption.
\GenericError  ...
                                                  \endgroup
l.17 \end{tikzpicture}

?
runsystem(gnuplot 5.pgf-plot.gnuplot)...executed.

PGFPlots: reading {5.pgf-plot.table}
LaTeX Font Info:    External font `cmex10' loaded for size
(Font)              <7> on input line 1.
LaTeX Font Info:    External font `cmex10' loaded for size
(Font)              <5> on input line 1.
[1

{/var/lib/texmf/fonts/map/pdftex/updmap/pdftex.map}] (./5.aux)

Re: [Pgfplots-features] Place object in polar coordinates around a different center than (0, 0) in pgfplots

[Christian F. <cfe...@go...>]

Hi Elke,

you should probably post this request on the PGF mailing list.

Kind regards

Christian

Am 24.06.2013 19:41, schrieb Elke Faßhauer:
> Dear all,
>
> I am struggeling to place an object (a red circle) using polar
> coordinates with respect to a chosen center called ground.
>
> Any ideas?
>
> Here is the snipped:
>
>       \documentclass[]{beamer}
>       \usepackage[T1]{fontenc}
>       \usepackage[english,german]{babel}
>       \usepackage{xcolor}
>       \usepackage{graphicx}
>
>       \usepackage{tikz,pgfplots}
>       \usetikzlibrary{positioning,fadings,patterns}
>
>       \usepackage{tikz,pgfplots}
>       \usetikzlibrary{positioning,fadings,patterns}
>
>       \tikzfading[name=fade inside,
>               inner color=transparent!80,
>               outer color=transparent!30]
>
>
>       \begin{document}
>          \begin{tikzpicture}[scale=0.5]
>              \draw [help lines] (0,0) grid (23,5);
>              \coordinate(ground)   at (2,2) {};
>              \draw [very thick] (ground) circle (1.2);
>              \shade [ball color=white,path fading=fade inside] (ground)
> circle (1.5);
>              \coordinate (ov1) at (0:1.5) {};
>              \shade [ball color=red] (ov1) circle (0.2);
>          \end{tikzpicture}
>       \end{document}
>
> I have tried to place several +s in front of the polar coordinates, but
> this does not show any effect.
>
> Thank you in advance.
>
> Elke
>
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[Pgfplots-features] Place object in polar coordinates around a different center than (0, 0) in pgfplots

[Elke F. <elk...@pc...>]

Dear all,

I am struggeling to place an object (a red circle) using polar 
coordinates with respect to a chosen center called ground.

Any ideas?

Here is the snipped:

     \documentclass[]{beamer}
     \usepackage[T1]{fontenc}
     \usepackage[english,german]{babel}
     \usepackage{xcolor}
     \usepackage{graphicx}

     \usepackage{tikz,pgfplots}
     \usetikzlibrary{positioning,fadings,patterns}

     \usepackage{tikz,pgfplots}
     \usetikzlibrary{positioning,fadings,patterns}

     \tikzfading[name=fade inside,
             inner color=transparent!80,
             outer color=transparent!30]


     \begin{document}
        \begin{tikzpicture}[scale=0.5]
            \draw [help lines] (0,0) grid (23,5);
            \coordinate(ground)   at (2,2) {};
            \draw [very thick] (ground) circle (1.2);
            \shade [ball color=white,path fading=fade inside] (ground) 
circle (1.5);
            \coordinate (ov1) at (0:1.5) {};
            \shade [ball color=red] (ov1) circle (0.2);
        \end{tikzpicture}
     \end{document}

I have tried to place several +s in front of the polar coordinates, but 
this does not show any effect.

Thank you in advance.

Elke

[Pgfplots-features] Python interface for pgfplots

[Olivier V. <oli...@gm...>]

Hi!

I just released an improved interface of pgfplots for Python (loosely based on the one in the pgfplots project).

The code is on github: https://github.com/olivierverdier/pygfplots

Best
== Olivier Verdier

Re: [Pgfplots-features] Problems porting to new platform

[Christian F. <cfe...@go...>]

Hi Oliver,

given just that fragment, I can only assume that something concerning 
the etex package is different in your installation.

More precisely, there is a switch in pgfkeys.code.tex which defines 
\pgfkeysifdefined in a different way depending on whether etex is 
available or not. From what I know, it typically *is* available. Perhaps 
it is not for your version.

I am referring to the instruction

\def\pgfkeys@ifcsname#1\endcsname#2\else#3\fi{\expandafter\ifx\csname#1\endcsname\relax#3\else#2\fi}%
\ifx\eTeXrevision\undefined%
\else%
   \expandafter\let\expandafter\pgfkeys@ifcsname\csname ifcsname\endcsname%
\fi

In other words: you could write

\makeatletter
\show\pgfkeys@ifcsname

and/or

\ifx\eTeXrevision\undefined
     \message{ETEX UNDEFINED}
\else
     \message{ETEX DEFINED}
\fi

to see if something is different (this is purely diagnostic). Perhaps 
you can make a difference by adding

\usepackage{etex} ?

Kind regards

Christian

Am 12.06.2013 10:21, schrieb Oliver Urbann:
> Hi all,
>
> I'm trying to port texlive to a rare OS called MorphOS. At the moment
> most important things are working. I can compile all for me important
> documents. But I have a problem with pgfplots. When I try to compile the
> example using "pdftex --progname=pdflatex pgfplotsexample.tex" I get the
> following error:
>
> ! Extra \else.
> \pgfkeysifdefined ...me pgfk@#1\endcsname #2\else
>                                                     #3\fi
> l.13 ^^I^^I\addplot
>                       coordinates {
> ?
> ! Emergency stop.
>
> I would not say it is a bug in pgfplots. But maybe some one knows what
> is wrong with my tex setup?
>
> Best regards,
> Oliver
>
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[Pgfplots-features] Problems porting to new platform

[Oliver U. <oli...@tu...>]

Hi all,

I'm trying to port texlive to a rare OS called MorphOS. At the moment 
most important things are working. I can compile all for me important 
documents. But I have a problem with pgfplots. When I try to compile the 
example using "pdftex --progname=pdflatex pgfplotsexample.tex" I get the 
following error:

! Extra \else.
\pgfkeysifdefined ...me pgfk@#1\endcsname #2\else
                                                   #3\fi
l.13 ^^I^^I\addplot
                     coordinates {
?
! Emergency stop.

I would not say it is a bug in pgfplots. But maybe some one knows what 
is wrong with my tex setup?

Best regards,
Oliver

Re: [Pgfplots-features] Scatter (y)bar plots?

[Denis B. <dbi...@wa...>]

Le lundi 10/06/13 à 20h44,
Christian Feuersaenger <cfe...@go...> a écrit :

> Hi Denis,

Hi Christian,

> there is a different solution which might work. I prepared it as 
> low-level backend in order to implement a "nice, understandable 
> interface in pgfplots"... however, it never made it that far and it
> is far from "nice, understandable".

Too bad... I will wait as long as it takes! ;)

> It is a set of two hooks which is installed at the beginning and end
> of every bar. Combined with a bit of fine tuning, you get what you
> wanted...

Indeed, it works like a charm.
 
> Here is the code:
>
> [...]
>
> You see that I did something slightly more complicated: I shaded the 
> bars depending on the 'mapped color'. The 'shaded bars' style relies
> on the two (currently undocumented) keys 'at begin bar' and 'at end
> bar'. The two macros inside of it are mandatory; they take the "raw"
> point meta; map them into the min/max range and define the 'mapped
> color'. The rest is basically your example.

Okay.
 
> I always wanted to improve the bar plot handler systematically - once
> I find time to do it; this kind of functionality will also receive
> attention.

That's a very good news: thanks a lot!

Kind regards.
-- 
Denis

Re: [Pgfplots-features] pgfplots and pgfplotstable numbers in XeLaTeX

[Christian F. <cfe...@go...>]

Hi Mike,

thanks for your interest in pgfplots! I am glad it proves to be useful.

Concerning your request to typeset ticks without math mode: you almost 
had it except that \pgfmathprintnumber beats you a bit. You are right; 
it really starts math mode implicitly.

There are two potential cures: the first is to write

\pgfmathprintnumber[assume math mode,verbatim]{\tick}%

and the second is to use \pgfmathprintnumberto instead of 
\pgfmathprintnumber, i.e. something like

       yticklabel={
         \pgfmathprintnumberto[verbatim]{\tick}\TEMP
         %
         \TEMP =
         %
         \romannumeral \TEMP%
     },

In the first solution, the 'assume math mode' key tells pgfmath that it 
should not ensure math mode on its own; it silently assumes that you 
know what you are doing.

The second solution does not typeout the numbers: it stores the result 
into the argument which comes after the number (in our case, it is 
\TEMP).  We can use this value in many ways; the simplest is to typeset 
it (by writing \TEMP). A more complicated way is to prefix it by 
\romannumeral (which is a bit strange, I admit it ;-)  ).

This should allow your use-case.

Kind regards

Christian

PS
I took the freedom to post a copy of this reply on the pgfplots mailing 
list in order to help others with similar problems. I hope you do not mind.


Am 10.06.2013 17:37, schrieb Michael Grant:
> Dear Sir,
>
> I have been a long time user of your excellent packages pgfplots and 
> pgfplotstable.  I am deeply grateful for the seamless integration of 
> numerical data to visual graphs your packages provide.
>
> I have recently had to use XeLaTeX to produce a document in a style 
> conformant to a "corporate standard".  And notice that the ticks of a 
> pgfplot are formatted in math mode.
>
> I have solved the problem by 
> using: yticklabel={\pgfmathprintnumber[verbatim]{\tick}} and was 
> wondering if, on detection of an XeTex compiler the 
> \axisdefaultticklabel macro could be changed to
>
> \def\axisdefaultticklabel{\pgfmathprintnumber[verbatim]{\tick}}.
>
> Apropos, I see that even removing the math mode $'s still has 
> \pgfmathprintnumber producing text in math mode.
>
> Respectfully,
>
> Mike.
> This communication is intended for the addressee only. It is 
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Re: [Pgfplots-features] Scatter (y)bar plots?

[Christian F. <cfe...@go...>]

Hi Jake,

this is a really cool approach!

Kind regards

Christian

Am 06.06.2013 14:10, schrieb Juernjakob Dugge:
> You could adapt the approach from
> http://tex.stackexchange.com/questions/116765/particular-bar-plot-with-pgfplots-bar-color-category/116773#116773
> for this, which uses the `scatter/@pre marker code` to draw "fake" bars:
>
> \documentclass{article}
> \usepackage{pgfplots}
> \pgfplotsset{compat=1.8}
> \begin{document}
> \begin{tikzpicture}
>     \begin{axis}[ymin=0]
>       \addplot+[
>       scatter,
>       only marks,
>       colormap={test}{
>         color=(blue!10); color=(blue!20); color=(blue!30);
> color=(blue!40); color=(blue!50); color=(blue!60); color=(blue!70) },
>       scatter/use mapped color={draw=blue,fill=mapped color},
>       scatter/@pre marker code/.append code={
>               \pgfkeys{/pgf/fpu=true,/pgf/fpu/output format=fixed}
> \pgfmathsetmacro\negheight{-\pgfplotspointmeta}
>               \fill [draw=black] (-1ex,0) rectangle ([xshift=1ex]axis
> direction cs:0,\negheight);
>               \pgfplotsset{mark=none}
>           },
>       ]
>       plot coordinates {
>         (1,1565)
>         (2,1164)
>         (3,740)
>         (4,2273)
>         (5,1688)
>         (6,2942)
>       };
>     \end{axis}
> \end{tikzpicture}
> \end{document}
>
> On 06/06/2013 04:23 AM, Denis Bitouzé wrote:
>> Hello,
>>
>> is there a way to get scatter (y)bar plots, I mean the bars filled
>> with a colour depending on the y values?
>>
>> The following MCE doesn't give the expected result:
>>
>> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
>> \documentclass{article}
>> \usepackage{pgfplots}
>> \pgfplotsset{compat=1.8}
>> \begin{document}
>> \begin{tikzpicture}
>>     \begin{axis}[ybar]
>>       \addplot+[
>>       colormap={test}{
>>         color=(blue!10); color=(blue!20); color=(blue!30);
>> color=(blue!40); color=(blue!50); color=(blue!60); color=(blue!70) },
>>       scatter/use mapped color={draw=blue,fill=mapped color}
>>       ]
>>       plot coordinates {
>>         (1,1565)
>>         (2,1164)
>>         (3,740)
>>         (4,2273)
>>         (5,1688)
>>         (6,2942)
>>       };
>>     \end{axis}
>> \end{tikzpicture}
>> \end{document}
>> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
>>
>> Thanks.
>
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Re: [Pgfplots-features] Scatter (y)bar plots?

[Christian F. <cfe...@go...>]

Hi Denis,

there is a different solution which might work. I prepared it as 
low-level backend in order to implement a "nice, understandable 
interface in pgfplots"... however, it never made it that far and it is 
far from "nice, understandable".

It is a set of two hooks which is installed at the beginning and end of 
every bar. Combined with a bit of fine tuning, you get what you wanted...

Here is the code:

\documentclass{report}

\usepackage{pgfplots}

\pgfplotsset{compat=1.6}

\pgfplotsset{
     shaded bars/.style={
         point meta=y,
         at begin bar={%
             \pgfplotsaxisvisphasetransformpointmeta
\pgfplotscolormapdefinemappedcolor{\pgfplotspointmetatransformed}%
             \begin{scope}[left color=black,right color=mapped color]%
             \shade\pgfextra
         },
         at end bar={%
             \endpgfextra;
             \end{scope}%
         },
     },
}

\begin{document}
\thispagestyle{empty}

\begin{tikzpicture}
   \begin{axis}[ybar]
     \addplot+[
         shaded bars,
         colormap={test}{
           color=(blue!10); color=(blue!20); color=(blue!30);
             color=(blue!40); color=(blue!50); color=(blue!60); 
color=(blue!70) },
     ]
     plot coordinates {
       (1,1565)
       (2,1164)
       (3,740)
       (4,2273)
       (5,1688)
       (6,2942)
     };
   \end{axis}
\end{tikzpicture}
\end{document}


Attached is the result.

You see that I did something slightly more complicated: I shaded the 
bars depending on the 'mapped color'. The 'shaded bars' style relies on 
the two (currently undocumented) keys 'at begin bar' and 'at end bar'. 
The two macros inside of it are mandatory; they take the "raw" point 
meta; map them into the min/max range and define the 'mapped color'. The 
rest is basically your example.

I always wanted to improve the bar plot handler systematically - once I 
find time to do it; this kind of functionality will also receive attention.

Kind regards

Christian


Am 06.06.2013 10:23, schrieb Denis Bitouzé:
> Hello,
>
> is there a way to get scatter (y)bar plots, I mean the bars filled
> with a colour depending on the y values?
>
> The following MCE doesn't give the expected result:
>
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> \documentclass{article}
> \usepackage{pgfplots}
> \pgfplotsset{compat=1.8}
> \begin{document}
> \begin{tikzpicture}
>    \begin{axis}[ybar]
>      \addplot+[
>      colormap={test}{
>        color=(blue!10); color=(blue!20); color=(blue!30);
> color=(blue!40); color=(blue!50); color=(blue!60); color=(blue!70) },
>      scatter/use mapped color={draw=blue,fill=mapped color}
>      ]
>      plot coordinates {
>        (1,1565)
>        (2,1164)
>        (3,740)
>        (4,2273)
>        (5,1688)
>        (6,2942)
>      };
>    \end{axis}
> \end{tikzpicture}
> \end{document}
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
>
> Thanks.

Re: [Pgfplots-features] Scatter (y)bar plots?

[Denis B. <dbi...@wa...>]

Le jeudi 06/06/13 à 08h10,
Juernjakob Dugge <jue...@gm...> a écrit :

> You could adapt the approach from 
> http://tex.stackexchange.com/questions/116765/particular-bar-plot-with-pgfplots-bar-color-category/116773#116773 
> for this, which uses the `scatter/@pre marker code` to draw "fake"
> bars:

Wow! It is works like a charm and I would have been unable to find this
solution by myself! Many thanks...

Maybe such a feature could be implemented with a nice and
understandable interface in pgfplots? :)

Thanks again!
-- 
Denis

Re: [Pgfplots-features] Scatter (y)bar plots?

[Juernjakob D. <jue...@gm...>]

You could adapt the approach from 
http://tex.stackexchange.com/questions/116765/particular-bar-plot-with-pgfplots-bar-color-category/116773#116773 
for this, which uses the `scatter/@pre marker code` to draw "fake" bars:

\documentclass{article}
\usepackage{pgfplots}
\pgfplotsset{compat=1.8}
\begin{document}
\begin{tikzpicture}
   \begin{axis}[ymin=0]
     \addplot+[
     scatter,
     only marks,
     colormap={test}{
       color=(blue!10); color=(blue!20); color=(blue!30);
color=(blue!40); color=(blue!50); color=(blue!60); color=(blue!70) },
     scatter/use mapped color={draw=blue,fill=mapped color},
     scatter/@pre marker code/.append code={
             \pgfkeys{/pgf/fpu=true,/pgf/fpu/output format=fixed}
\pgfmathsetmacro\negheight{-\pgfplotspointmeta}
             \fill [draw=black] (-1ex,0) rectangle ([xshift=1ex]axis 
direction cs:0,\negheight);
             \pgfplotsset{mark=none}
         },
     ]
     plot coordinates {
       (1,1565)
       (2,1164)
       (3,740)
       (4,2273)
       (5,1688)
       (6,2942)
     };
   \end{axis}
\end{tikzpicture}
\end{document}

On 06/06/2013 04:23 AM, Denis Bitouzé wrote:
> Hello,
>
> is there a way to get scatter (y)bar plots, I mean the bars filled
> with a colour depending on the y values?
>
> The following MCE doesn't give the expected result:
>
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> \documentclass{article}
> \usepackage{pgfplots}
> \pgfplotsset{compat=1.8}
> \begin{document}
> \begin{tikzpicture}
>    \begin{axis}[ybar]
>      \addplot+[
>      colormap={test}{
>        color=(blue!10); color=(blue!20); color=(blue!30);
> color=(blue!40); color=(blue!50); color=(blue!60); color=(blue!70) },
>      scatter/use mapped color={draw=blue,fill=mapped color}
>      ]
>      plot coordinates {
>        (1,1565)
>        (2,1164)
>        (3,740)
>        (4,2273)
>        (5,1688)
>        (6,2942)
>      };
>    \end{axis}
> \end{tikzpicture}
> \end{document}
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
>
> Thanks.

[Pgfplots-features] Scatter (y)bar plots?

[Denis B. <dbi...@wa...>]

Hello,

is there a way to get scatter (y)bar plots, I mean the bars filled
with a colour depending on the y values?

The following MCE doesn't give the expected result:

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\documentclass{article}
\usepackage{pgfplots}
\pgfplotsset{compat=1.8}
\begin{document}
\begin{tikzpicture}
  \begin{axis}[ybar]
    \addplot+[
    colormap={test}{
      color=(blue!10); color=(blue!20); color=(blue!30);
color=(blue!40); color=(blue!50); color=(blue!60); color=(blue!70) },
    scatter/use mapped color={draw=blue,fill=mapped color}
    ]
    plot coordinates {
      (1,1565)
      (2,1164)
      (3,740)
      (4,2273)
      (5,1688)
      (6,2942)
    };
  \end{axis}
\end{tikzpicture}
\end{document}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

Thanks.
-- 
Denis

Re: [Pgfplots-features] ! Dimension too large.

[Neal H. W. <ne...@wa...>]

Hi, Christian,

At Thu, 30 May 2013 12:40:35 +0200,
Christian Feuersaenger wrote:
> How important is that fix for you? Do you report it for reasons of 
> anoyance and of completeness (probably both true) or do you really need 
> a log plot with such a small data range?

It's not a problem for me.  I stumbled upon the bug due to a bug of my
own and reported the issue that I observed.

Thanks,

Neal

Re: [Pgfplots-features] ! Dimension too large.

[Christian F. <cfe...@go...>]

Hi Neal,

this is a bug, indeed... it happens because the displayed data range 
becomes too small.

After application of logs, you find the data range
log( [1000,1001]) = [ 6.90775527898214 , 6.90875477931522]

for linear axes, pgfplots applies some rescaling and shifting to reduce 
the problem. For log axes, it keeps the logs as-is which beats you here.

A work-around would be to type "xmax=1090" (i.e. to enlarge the 
displayed limit manually).

How important is that fix for you? Do you report it for reasons of 
anoyance and of completeness (probably both true) or do you really need 
a log plot with such a small data range?

Kind regards

Christian

Am 27.05.2013 14:31, schrieb Neal H. Walfield:
> Consider the following plot:
>
>    \documentclass{article}
>    
>    \usepackage{pgfplots}
>    \pgfplotsset{compat=1.8}
>    
>    \begin{document}
>    \def\x{1001}
>    \begin{tikzpicture}
>      \begin{semilogxaxis}
>        \addplot coordinates {
>          (1000, 0)
>          (\x, 1)
>        };
>      \end{semilogxaxis}
>    \end{tikzpicture}
>    \end{document}
>
> Compiling this, I get:
>
> ! Dimension too large.
> <recently read> \pgf@xx
>                          
> l.14     \end{semilogxaxis}
>
> This happens for values of \x up to 1075.
>
> I think this is a bug.  I tested against 1.8.
>
> Thanks,
>
> Neal
>
>
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[Pgfplots-features] ! Dimension too large.

[Neal H. W. <ne...@wa...>]

Consider the following plot:

  \documentclass{article}
  
  \usepackage{pgfplots}
  \pgfplotsset{compat=1.8}
  
  \begin{document}
  \def\x{1001}
  \begin{tikzpicture}
    \begin{semilogxaxis}
      \addplot coordinates {
        (1000, 0)
        (\x, 1)
      };
    \end{semilogxaxis}
  \end{tikzpicture}
  \end{document}

Compiling this, I get:

! Dimension too large.
<recently read> \pgf@xx 
                        
l.14     \end{semilogxaxis}

This happens for values of \x up to 1075.

I think this is a bug.  I tested against 1.8.

Thanks,

Neal

[Pgfplots-features] Pgfplots version 1.8 released

[Christian F. <cfe...@go...>]

Hello users of pgfplots,

I am glad to announce the release of version 1.8!

Note that the version on CTAN is version 1.8, even if it still displays 
version number 1.7 (probably some missing database update on CTAN).

Attaches you find the release notes for version 1.8.

Kind regards

Christian


1.8:
- new feature: tight bounding box even if the axis is no box and bb 
excludes clip path
- new feature: mesh/color input=explicit
- new feature: shader=interp now has drivers for both dvipdfmx and xetex
- new feature: support for more color spaces in colormap definitions
- new feature: shader=interp and device-level gray colorspaces
- new feature: 'contour/contour dir=[xyz]' to draw contours in different 
directions
- new feature: statistics library with boxplot handler (both boxplot 
prepared and automatic computation)
- fixed bug: 3d centered axis lines and label placement (requires 
compat=1.8 or higher)
- fixed bug: axis lines and placement of labels, tick scale labels, and 
reversed axes
     (requires compat=1.8 or higher)
- fixed bug: filtering out coords from a mesh plot failed
- fixed bug: every legend image post was not respected inside of 
\ref{plotlabel}
- fixed bug: high-order patches computed the shader=flat mean in a wrong 
way.
- fixed bug: remember picture inside of pgfplots axes failed (due to 
cell picture)
- fixed bug: now, the tick scale label will be omitted if there are no ticks
- fixed bug: axis box path was not closed
- fixed bug: the bounding box was non-empty even if the axis was hidden.
- fixed bug: auto-alignment of nodes near coords failed for xbar plots
- fixed bug: providing bar width / bar shift in terms of axis units did
     not work with [xy]bar and nodes near coords
- fixed bug: transformation 'data cs=cart' -> polar is more robust now
- fixed bug: code did not compile against pgf 2.00
- fixed bug: patch plot lib and shader=interp,patch type=biquadratic
- fixed bug: context path searching issue (pgfplots.lua)
- fixed bug: shader=interp and dvips driver
- fixed bug: error bars with explicit relative input failed

1.7
- added feature: 'bar shift' and 'bar width' can now be expressed in 
terms of axis units (compat=1.7 or higher)
- fixed incompatibility regression pgfplots 1.6.1 pgf 2.10: layers
- fixed incompatibility pgfplots and imakeidx
- added feature: 'enlargelimits={abs=1cm}', i.e. enlarge by dimension 
rather than unit
- patchplots lib: added patch type=bicubic
- patchplots lib: added support for global paths (fillable)
- patchplots lib: added patch type sampling feature
- patchplots lib: improved usability (documentation and improvements)
- fixed path issues in context: moved lua input file to tex/generic
- fixed bug: \ref{legendimage} inside of legend text was wrong.

1.6.1:
- fixed incompatibility lualatex,shader=interp, and german package 
(introduced in 1.6)

1.6:
- added support for layered graphics (main use case: multiple axes and 
layers)
- added support for second colormap in mesh plots (mesh/interior 
colormap name)
- added support for scopes inside of axes
- contour plots: added ability to provide list of discrete labels 
(mesh/levels)
- empty lines are interpreted as interruptions in data plots (was 
undocumented since 1.4)
- added more scaling options to 'scale mode=scale uniformly' (affects 
axis equal in 3d
   and \addplot3 graphics)
- fixed wrong implementation of 'axis equal' and 'unit vector ratio' in 3d
   (backwards compatible for 2d, but not for 3d - the 3d implementation 
was plain wrong)
- fixed incompatibility of lualatex and shader=interp
- fixed bugs/added features around \addplot3 graphics
- fixed bug: colorbar did not support ymode=log
- fixed a couple of minor bugs
- fixed bounding box computation for clip=false,axis lines=none

Re: [Pgfplots-features] Scatter plot: using a discrete/sampled colormap

[Christian F. <cfe...@go...>]

Hi Mike,

Your observation is correct: colorbar sampled simply changes the way the 
colorbar is displayed; it does not control the way colors are mapped 
into the colormap.

This is actually unsupported and would need to become a feature request.

What you can use is to employ the low-level interface for scatter plots 
to write such stuff on your own.

A related application can be found in the pgfplots manual (search for 
"Low-Level scatter plot interface Example"). Please refer to that 
section to see if that is something for you. For your convencience, here 
is a copy of the mentioned example (the manual contains explanations):

\begin{tikzpicture}
% Low-Level scatter plot interface Example:
% use three different marker classes
% 0% - 30%    : first class
% 30% - 60% : second class
% 60% - 100% : third class
\begin{axis}[
scatter/@pre marker code/.code={%
    \ifdim\pgfplotspointmetatransformed pt<300pt
       \def\markopts{mark=square*,fill=blue}%
    \else
       \ifdim\pgfplotspointmetatransformed pt<600pt
          \def\markopts{mark=triangle*,fill=orange}%
       \else
          \def\markopts{mark=pentagon*,fill=red}%
       \fi
    \fi
    \expandafter\scope\expandafter[\markopts]
},%
scatter/@post marker code/.code={%
    \endscope
}]
\addplot+[scatter,scatter src=y,
     samples=40]
    {sin(deg(x))};
\end{axis}
\end{tikzpicture}

Kind regards

Christian

Am 29.03.2013 12:58, schrieb Mike Hettich:
> Dear all,
>
> I hevaily use pgfplots for preparing graphs. I encountered a problem I
> was not able to solve yet. While it is possible to use the key "sampled"
> for the colorbar the respective data points in the plot are still
> linearly mapped onto the provided colormap. I have not found an option
> yet to force a discrete colormapping for the scatter plot, i.e. one
> color for a range of values instead of color interpolation. I hope you
> can provide some advice on how to solve this issue.
>
>
> Best regards
> Mike
>
> ------------------------------------------------------------------------------
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> _______________________________________________
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> Pgf...@li...
> https://lists.sourceforge.net/lists/listinfo/pgfplots-features

[Pgfplots-features] Scatter plot: using a discrete/sampled colormap

[Mike H. <mik...@gm...>]

Dear all,

I hevaily use pgfplots for preparing graphs. I encountered a problem I 
was not able to solve yet. While it is possible to use the key "sampled" 
for the colorbar the respective data points in the plot are still 
linearly mapped onto the provided colormap. I have not found an option 
yet to force a discrete colormapping for the scatter plot, i.e. one 
color for a range of values instead of color interpolation. I hope you 
can provide some advice on how to solve this issue.


Best regards
Mike

Re: [Pgfplots-features] automatically selecting some non-overlapping tick labels

[Neal H. W. <ne...@wa...>]

FWIW, I've attached the R code that I'm using to choose ticks and tick
labels.  The algorithms are sound, but the lack of context means that
I have to make assumptions about the text size and available space.

Examples:

> source('axis.R')
> axis.ticks.generate(1:100)
 [1]   0  10  20  30  40  50  60  70  80  90 100
> axis.ticks.generate(1:100, log=TRUE)
 [1]   1.0   1.8   3.0   6.0  10.0  18.0  32.0  56.0 100.0
> axis.labels.select(axis.ticks.generate(1:100))
 [1] "0"   "10"  "20"  "30"  "40"  "50"  "60"  "70"  "80"  "90"  "100"
> axis.labels.select(axis.ticks.generate(1:100), available.space=20)
 [1] "0"   ""    "20"  ""    "40"  ""    "60"  ""    "80"  ""    "100"

Perhaps this code will be useful to someone.

Neal


make.multiple.of <- function(x, multiple,
                             towards.zero=FALSE,
                             away.from.zero=FALSE,
                             towards.positive.infinity=FALSE,
                             towards.negative.infinity=FALSE) {
  if (sum(sapply(list(towards.zero,
                      away.from.zero,
                      towards.positive.infinity,
                      towards.negative.infinity),
                 function (x) identical(x, FALSE)))
      != 3) {
    browser()
    stop("You must set exactly one of towards.zero, away.from.zero, towards.positive.infinity or towards.negative.infinity to TRUE")
  }

  if (towards.zero)
    return (sign(x) * (abs(x) - abs(x) %% multiple))
  if (away.from.zero)
    return (sign(x) * (abs(x) + (-abs(x) %% multiple)))

  if (towards.positive.infinity) {
    mask = x < 0
  } else {
    stopifnot(towards.negative.infinity)
    mask = x > 0
  }

  x[mask] = make.multiple.of(x[mask], multiple=multiple, towards.zero=TRUE)
  x[!mask] = make.multiple.of(x[!mask], multiple=multiple, away.from.zero=TRUE)

  return (x)
}

axis.ticks.generate <- function(values,
                                log=FALSE,
                                ticks=10,
                                verbose=FALSE) {
  if (log)
    values = base::log(values, 10)

  # Compute the difference between the extremes.

  min.value = min(values)
  max.value = max(values)
  value.range = max.value - min.value

  if (value.range > 10 && log) {
    min.value = floor(min.value)
    max.value = ceiling(max.value)
    value.range = max.value - min.value
  }

  orders.of.magnitude = max(floor(log(abs(value.range), base=10)))

  if (verbose)
    cat(sprintf("%g - %g => width of %g (spans %d orders of magnitude)\n",
                min.value, max.value, value.range, orders.of.magnitude))

  generate.ticks <- function(step.size.multiple) {
    step.size = step.size.multiple * 10^(orders.of.magnitude - 1)
    min.axis = make.multiple.of(min.value, step.size,
      towards.negative.infinity=TRUE)
    max.axis = make.multiple.of(max.value, step.size,
      towards.positive.infinity=TRUE)

    ticks = seq(min.axis, max.axis, step.size)
    if (verbose)
      cat(sprintf("Step size of %g (multiple: %g) results in %d ticks:\n %s\n",
                  step.size, step.size.multiple, length(ticks),
                  paste(sprintf("%g", ticks), collapse=", ")))

    # Trim the ticks, if appropriate.

    # In steps.
    max.margin = 0.5

    separation = (min.value - ticks[1]) / step.size
    if (separation > max.margin) {
      if (verbose)
        cat(sprintf("trimming left: (%g of a step >= %g of a step)\n",
                    separation, max.margin))

      ticks[1] = min.value
    }

    separation = (ticks[length(ticks)] - max.value) / step.size
    if (separation > max.margin) {
      if (verbose)
        cat(sprintf("trimming right: (%g of a step >= %g of a step)\n",
                    separation, max.margin))

      ticks[length(ticks)] = max.value
    }

    return (ticks)
  }

  # Choose the step size that is as close to 10 ticks as possible.
  step.size.multiples = c(1, 1.25, 2.5, 5, 10)
  # We prefer multiples of 10.
  step.size.penalties = c(0,    2, 1.5, 1,  0)
  step.size.multiple = step.size.multiples[
    which.min(abs(ticks
                  - (sapply(step.size.multiples,
                           function (m) {
                             length(generate.ticks(m))
                           })
                     + step.size.penalties)))]

  if (verbose)
    cat(sprintf("Optimal step size multiple for %d ticks is %g\n",
                ticks, step.size.multiple))

  ticks = generate.ticks(step.size.multiple)

  if (log) {
    ticks = 10^ticks
    if (10^value.range < 2)
      ticks = signif(ticks, 2)
    else {
      small = abs(ticks) < 2
      large = abs(ticks) >= 100
      medium = !(small | large)

      ticks[small] = round(ticks[small], 1)
      ticks[medium] = round(ticks[medium])
      ticks[large] = signif(ticks[large], 2)

      ticks = unique(ticks)
    }
  }

  return (ticks)
}

axis.labels.select <- function(ticks, labels=NULL,
                               axis='x',
                               available.space=NULL,
                               log=FALSE, log.base=NULL,
                               verbose=FALSE) {
  stopifnot(is.numeric(ticks))
  if (length(ticks) <= 1)
    return (as.character(ticks))

  if (is.null(labels))
    labels = ticks
  if (is.numeric(labels)) {
    if (max(abs(ticks)) >= 10)
      # We have single and double digit numbers.  Make the single
      # digit numbers single digit and the wider numbers significant
      # to 2 places.
      labels = ifelse(abs(ticks) >= 10, signif(ticks, 2), round(ticks))
    else
      # Use 2 significant digits, except for the last tick.
      labels = signif(ticks, 2)

    labels[length(labels)] = ticks[length(ticks)]
    labels = sprintf("%g", labels)
  }

  stopifnot(length(ticks) == length(labels))
  stopifnot(is.character(labels))

  if (log) {
    if (is.null(log.base))
      log = base::log
    else {
      log = function(x) { base::log(x, base=log.base) }
      exp = function(x) { log.base^x }
    }
  } else {
    log = identity
    exp = identity
  }

  stopifnot(axis %in% c('x', 'y'))

  # Assuming labels are evenly spaced:
  #
  # If all labels are 2 characters wide, we can have 11 labels without
  # overlap.  That's 22 characters plus 10 inter-label spaces.
  #
  # If all labels are 3 characters, then we can have 8 labels
  # without overlap.  That's 24 characters plus 7 interlabel spaces.
  #
  # If all labels are 4 characters, then we can have 6 labels
  # without overlap.  That's 24 characters plus 5 interlabel spaces.
  #
  # Thus, we have space for about 37 characters (digits or spaces).
  #
  # This means that we can have a density of one character every
  # 1/37th of the x-axis.

  if (is.null(available.space))
    available.space = if (axis == 'x') 37 else 20


  # Here's our approach: for each pair of adjacent, non-empty
  # labels, we compute the number of characters from the middle of
  # the left label to the middle of the right label and the amount
  # of available space.  If the character density exceeds the
  # threshold, then we kill one of the labels.

  # Compute the position of each tick on a linear scale from 0 to 1.
  pos = (log(ticks) - log(ticks[1])) / (log(ticks[length(ticks)]) - log(ticks[1]))

  label.space <- function(label) {
    if (axis == 'y')
      # XXX: It's hard to compute the height.  Most likely, it is just
      # one, however.
      return (1)

    label = gsub("[\\][a-zA-Z]*", "x", label)
    label = gsub("$", "", label, fixed=TRUE)

    return (nchar(label)
       # Count punctuation as less than a character.
       # - .25 * sapply(strsplit(label, '[.,]'), length)
     )
  }

  stopifnot(length(ticks) >= 2)
  for (i in 2:(length(ticks))) {
    # Find the first label (largest x, such that x <= i - 1) that
    # is not the empty string.
    not.empty = which(labels[(i - 1):1] != "")
    if (length(not.empty) == 0)
      next
    left = ((i - 1):1)[not.empty[1]]

    right = i
    if (labels[right] == "")
      next

    used.chars =
      (sum(label.space(labels[c(left, right)])) / 2
       # The interlabel space.
       + 1)

    space = pos[right] - pos[left]
    available.chars = available.space * space

    if (verbose)
      cat(sprintf("Considering %s: space: %.2g => %.1f characters; have %g characters.\n",
                  paste(sprintf("'%s'", labels[c(left, right)]),
                        collapse=", "),
                  space, available.chars, used.chars))

    if (used.chars > available.chars) {
      # Kill the current label, unless this is the last label
      # (which we always want to keep).
      kill = if (right == length(ticks)) left else right
      if (verbose)
        cat(sprintf("Killing '%s' (index: %d)\n", labels[kill], kill))
      labels[kill] = ""
    }
  }

  labels
}

[Pgfplots-features] automatically selecting some non-overlapping tick labels

[Neal H. W. <ne...@wa...>]

Hi,

I wrote a program to generate plots.  It specifies the tick labels
that pgfplots should use.  This works great except when I have too
many ticks.  In this case, the labels overlap.  Is it possible to have
pgfplots select, say, the maximum number of nicely spaced tick labels
between which there is at least 1em of space?  Right now, I have a
hacky solution that selects at most 8 tick labels, but sometimes even
this is too many.

Thanks,

Neal

Re: [Pgfplots-features] x coord inv trafo/.code & logarithmic axes

[Neal H. W. <ne...@wa...>]

Hi Christian,

Thank you for your help.

At Sat, 19 Jan 2013 12:05:50 +0100,
Christian Feuersaenger wrote:
> PGFplots assumes that user-provided transformations fit into the axis, 
> i.e. that the transformation "knows" that it is to be applied in a log 
> context. Consequently, you'd need two transformations, one tailored for 
> linear axes and one tailored for log axes. This could be done by means 
> of styles.

So there is no way for the 'x coord inv trafo/.code' code to determine
that the argument is the log of the value and not the value?  That's
too bad.  Perhaps this is something that could be added to a future
version of pgfplots.

> I hope this helps so far.

It does!  Thanks!

:) Neal

Re: [Pgfplots-features] Unusual warning messages

[Denis B. <dbi...@wa...>]

Le samedi 19/01/13 à 12h10,
Christian Feuersaenger <cfe...@go...> a écrit :

> Thanks!

You're welcome! That's little work compared to pgfplots ;)
-- 
Denis