gnuplot-info — For questions and discussion about gnuplot

[Gnuplot-info] Bold print in postscript enhanced

[SB <ste...@gm...>]

Hello,
I try to include gnuplot graphs as eps in my documents. 

"help set terminal postscript enhanced" and "ps_guide.ps" helped me with
most of my problems (for example, with "deutschen Umlauten": äöüß), but
not with this one:

I would like to print some labels/titles in my plots as bold (or
underlined) text. How can I do this?

Thanks, 

Stephan

Re: [Gnuplot-info] resolution of a plot (table)

[Andreas M. <and...@tu...>]

Hans-Bernhard Bröker wrote:

> Andreas Matthias wrote:
>> The plot of a function (actually the printed table of that function)
>> is not very smooth because of the high gradients of that function. Is
>> there a way to specify how many points of a function are calculated to
>> draw (print) it?
> 
> See "help set samples"

Whew. Of course. I'm using isosamples quite often but did thought
of samples. Thanks for your help.

Ciao
Andreas

Re: [Gnuplot-info] Saving the graph plotted

[<br...@ph...>]

Chieneao Lee wrote:
> Is there any function in gnuplot that enable the graph plotted to be 
> saved as graphical file, such as gif , jpeg?

No.  Gnuplot doesn't "save" graphs.   It re-generates them to a 
different output device driver that writes graph files.  See "help set 
terminal" and "help set output".

Re: [Gnuplot-info] resolution of a plot (table)

[<br...@ph...>]

Andreas Matthias wrote:
> The plot of a function (actually the printed table of that function)
> is not very smooth because of the high gradients of that function. Is
> there a way to specify how many points of a function are calculated to
> draw (print) it?

See "help set samples"

[Gnuplot-info] Saving the graph plotted

[Chieneao L. <chi...@gm...>]

Is there any function in gnuplot that enable the graph plotted to be saved
as graphical file, such as gif , jpeg?

What is the command that can do it ?

It is very much appreciated if you can give me a example of command that can
save the graph plot using gnuplot in a jpeg or gif or other image file.

Thanks a lot!!

Best regards,
Lee

[Gnuplot-info] print the point value

[marco_k2 <mar...@ya...>]

Is it possible print the point value in a plot like in this way?

|
|
|             * 6
|
|   * 5   
|__________________

Thank's in advance
Marco

[Gnuplot-info] resolution of a plot (table)

[Andreas M. <and...@tu...>]

The plot of a function (actually the printed table of that function)
is not very smooth because of the high gradients of that function. Is
there a way to specify how many points of a function are calculated to
draw (print) it?

Ciao
Andreas

Re: [Gnuplot-info] which fit approximation is better?

[<br...@ph...>]

developer_student wrote:
> Then now I want to know which of them (stApprox or ndApprox) approximates
> better the curve of my data. 

The most important variable to look at here is the "Chisquare", i.e. the 
weighted sum of squared residuals.  Gnuplot prints it for you, and saves 
it to the log file.

[Gnuplot-info] which fit approximation is better?

[developer_student <jua...@gm...>]

Imagine I want to fit a set of points to a math function. And I know points
are well approximated by a*x^2 + b*x + c and also a*ln(x)*x + b*x + c . So I
type them in gnuplot:

stApprox(x) = a*x**2 + b*x + c
fit stApprox(x) 'mydata.dat' via a,b,c

ndApprox(x) = d*log(x)*x + e*x + f
fit ndApprox(x) 'mydata.dat' via d,e,f

Then now I want to know which of them (stApprox or ndApprox) approximates
better the curve of my data. 

How can I get it? Anyone can help me, please?

Thank you in advance.
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Re: [Gnuplot-info] automated plotting

[<br...@ph...>]

pau wrote:

> all the plots are black and white... ??? Why is that? I wrote "set terminal
> postscript eps enhanced "

That's why, exactly.  Read "help postscript" to understand it.

> Is there a way I can set pointsize 2 before "< zcat $f | gawk -f gnuplot.awk
> etc..." without having to resort to replot?

No. But there's a way to specify it after the "< zcat", but still inside 
the 'plot' command.  Read "help plot with" and watch out for "pointsize".

Re: [Gnuplot-info] automated plotting

[pau <all...@gm...>]

set terminal postscript eps color ... 

>Now I have a lot of eps files but have noticed that even if I specified 

>    plot "< zcat $f" using 3:4 with dots lt 8,\
                                                        ^^^^^^^^^
   
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Re: [Gnuplot-info] automated plotting

[pau <all...@gm...>]

>You went a bit too far.  You should just remove the awk command line 
>from gnuplot's view, not create an intermediate data file.  The idea was 
>to can that awk command into a separate script and then replace

that did the trick and this way I don't have to gunzip the files. Semingly
the gawk commands wrapped by gnuplot were the source of the problems.
Now I have a lot of eps files but have noticed that even if I specified 

    plot "< zcat $f" using 3:4 with dots lt 8,\
                                                        ^^^^^^^^^
         "< zcat $f | gawk -f gnuplot.awk \
         NAME=60001" using 3:4 with points pt 6 lt -1 ;
                                                                          
all the plots are black and white... ??? Why is that? I wrote "set terminal
postscript eps enhanced "

Is there a way I can set pointsize 2 before "< zcat $f | gawk -f gnuplot.awk
etc..." without having to resort to replot?
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Re: [Gnuplot-info] automated plotting

[<br...@ph...>]

pau wrote:
> Hi Hans-Bernard,
> 
> I did what you suggested and do the extra-gawk thing out of gnuplot. Now for
> each data file named "Splotch4_0010_part.asc" I have an additional one
> containing only the information of the row I looked for with gawk:
> "Splotch4_0010_part_b.asc"

You went a bit too far.  You should just remove the awk command line 
from gnuplot's view, not create an intermediate data file.  The idea was 
to can that awk command into a separate script and then replace

>     plot "< zcat $f" using 3:4 with dots lt 8, plot "< zcat $f | gawk -v
> NAME=60001 '/AS/ {TIME=$4} $1==NAME {print TIME,$2,$3,$4,$5,$6,$7,$8,$11;
> exit}'" using 3:4 with points pt 6 lt -1

by

plot "< zcat $f" using 3:4 with dots lt 8, \
      "< zcat $f | gawk -f myscript.awk NAME=60001" using 3:4 \
              with points pt 6 lt -1

[A side note: there was a superfluous "plot" keyword lurking in your 
posted version]

Re: [Gnuplot-info] automated plotting

[pau <all...@gm...>]

Hi Hans-Bernard,

I did what you suggested and do the extra-gawk thing out of gnuplot. Now for
each data file named "Splotch4_0010_part.asc" I have an additional one
containing only the information of the row I looked for with gawk:
"Splotch4_0010_part_b.asc"

Now it turns out that I am so silly that I don't know how to tell the script
to plot first Splotch4_0010_part.asc and then immediately
"Splotch4_0010_part_b.asc" :(

It must be easy but I am not good at all in scripting... The script looks
like

------------------------------------------
for f in Splotch4*  ; do
  eps_file=`basename $f .asc.gz`.eps

  gnuplot <<EOF
    unset key
    set xrange [-15:15]
    set yrange [-15:15]
    set xlabel "X (pc)" font "Helvetica,12"
    set ylabel "Y (pc)" font "Helvetica,12"
    set terminal postscript eps enhanced ; set output "$eps_file"
    set pointsize 1
    plot "< zcat $f" using 3:4 with dots lt 8, plot "< zcat $f | gawk -v
NAME=60001 '/AS/ {TIME=$4} $1==NAME {print TIME,$2,$3,$4,$5,$6,$7,$8,$11;
exit}'" using 3:4 with points pt 6 lt -1
    unset output
EOF
done
---------------------------------
The part containing "plot "< zcat $f | gawk -v NAME=60001 '/AS/ {TIME=$4}
$1==NAME {print TIME,$2,$3,$4,$5,$6,$7,$8,$11; exit}'" using 3:4 with points
pt 6 lt -1"
should be replaced with "gnuplot please now plot the file
Splotch4_0010_part_b.asc before you plot the following one,
Splotch4_0011_part.asc"

I know this is not a gnuplot question, but since you've been in this story
since the beginning and you seem to be good at scripting too, I resort to
you :)

heeelp! I'm very close to the final result!
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Re: [Gnuplot-info] Error: terminal "png" does not support continuous colors.

[Shigeru W. <sc205145@s.kyushu-u.ac.jp>]

Thanks for answering my question.

> Whoever build this gnuplot binary didn't have (or allow it to use) the 
> GD library, which is needed to get the fully-featured PNG driver.
> 
> In short, you got the wrong PNG driver.

I'll try to re-install gnuplot to use GD library.

Many thanks.
---------
Shigeru Wakita
e-mail:sc205145@s.kyushu-u.ac.jp

Re: [Gnuplot-info] Error: terminal "png" does not support continuous colors.

[<br...@ph...>]

Shigeru Wakita wrote:
> Following message are result of 'show version long'.Can this gnuplot
> support pm3d plotting ?

No.  The problem is here:

[...]
> Compile options:
> -READLINE  +LIBREADLINE  +HISTORY  -LIBGD  +PNG
                                      ^^^^^^

Whoever build this gnuplot binary didn't have (or allow it to use) the 
GD library, which is needed to get the fully-featured PNG driver.

In short, you got the wrong PNG driver.

Re: [Gnuplot-info] Error: terminal "png" does not support continuous colors.

[Shigeru W. <sc205145@s.kyushu-u.ac.jp>]

Thank you for your kind comment.

> Shigeru Wakita wrote:
> > "Error: terminal "png" does not support continuous colors."
> 
> > Why does this happen? 
> 
> Well, because the PNG terminal driver the gnuplot you're using doesn't 
> support pm3d plotting.  And since you didn't bother telling us which 
> gnuplot (and in particular, which PNG driver) that was, that's about all 
> anybody can tell you about it.  Show us the result of command 'show 
> version long' in your gnuplot, and a better answer might become possible.


Following message are result of 'show version long'.Can this gnuplot
support pm3d plotting ?

--------------------

gnuplot> show version long

        G N U P L O T
        Version 4.0 patchlevel 0
        last modified Thu Apr 15 14:44:22 CEST 2004
        System: Linux 2.6.17-1.2142_FC4smp

        Copyright (C) 1986 - 1993, 1998, 2004
        Thomas Williams, Colin Kelley and many others

        This is gnuplot version 4.0.  Please refer to the documentation
        for command syntax changes.  The old syntax will be accepted
        throughout the 4.0 series, but all save files use the new syntax.

        Type `help` to access the on-line reference manual.
        The gnuplot FAQ is available from
                http://www.gnuplot.info/faq/

        Send comments and requests for help to
                <gnu...@li...>
        Send bugs, suggestions and mods to
                <gnu...@li...>

Compile options:
-READLINE  +LIBREADLINE  +HISTORY  -LIBGD  +PNG
-NOCWDRC  +X11  +USE_MOUSE

DRIVER_DIR   = "/usr/libexec/gnuplot/4.0"
HELPFILE     = "/usr/share/gnuplot/4.0/gnuplot.gih"
CONTACT      = <gnu...@li...>
HELPMAIL     = <gnu...@li...>

------------------------
---------
Shigeru Wakita
e-mail:sc205145@s.kyushu-u.ac.jp

Re: [Gnuplot-info] Error: terminal "png" does not support continuous colors.

[<br...@ph...>]

Shigeru Wakita wrote:
> "Error: terminal "png" does not support continuous colors."

> Why does this happen? 

Well, because the PNG terminal driver the gnuplot you're using doesn't 
support pm3d plotting.  And since you didn't bother telling us which 
gnuplot (and in particular, which PNG driver) that was, that's about all 
anybody can tell you about it.  Show us the result of command 'show 
version long' in your gnuplot, and a better answer might become possible.

[Gnuplot-info] Error: terminal "png" does not support continuous colors.

[Shigeru W. <sc205145@s.kyushu-u.ac.jp>]

Hi

I'm using GNUPLOT and trying to save plots image as "png" figures.Everytime
error message appears.

"Error: terminal "png" does not support continuous colors."

I did 
"gnuplot>set terminal png"
"gnuplot>set output "*.png""
"gnuplot>set pm3d"
"gnuplot>splot "*.dat""
but error message showed and failed to save image.

Why does this happen? I have no ideas.
---------
Shigeru Wakita
e-mail:sc205145@s.kyushu-u.ac.jp

[Gnuplot-info] Fw: Re: sinclair casework

[Maher <bee...@no...>]

<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
</HEAD>
<BODY>
<DIV><img src="cid:Z44ETOZIBAX6M7TUHOUM"></DIV>
<DIV>'They  would  have  flung  thee  out at Mian Mir but for me. This way!'What  -  what is this?' the lama repeated. 'He must go to Benares. Heplantain  hanging  out  of his mouth. He headed straight for the shop,statement,  with  five  microscopic pin-holes in one corner, that mostlittle curry is good, and a fried cake, and a morsel of conserve wouldhead  that he might not see her, and muttered in Tibetan as she passedgreat  green-bronze  piece  is  always  first of the conqueror's loot.returned  it  full  of  hot rice. 'But my yogi is not a cow,' said Kimfor  a  new  light-ball to his hookah, and considered the case. If thecredit  Luchman Narain's bank-' This was entirely in the way of trade,or we are left,' cried Kim. 'See!' shrilled the Amritzar girl. 'He hasEuropean  scholars,  who  by  the  help  of  these and a hundred otherhad  gained  when  I  bowed  before  the Law within there.' He pointedof nights; but he looked more carefully, and, hand on amulet, drew hisis  not  good to go about without money. Thou wilt sell many horses tothat   vast  mass  of  'information  received'  on  which  the  Indiancompanies  there.'  The  soldier glared, for a Dogra is of other castefire-worshippers;  here  was  the Bodhisat in royal state as a prince;Northern  Power,  a  Hindu banker in Peshawur, a firm of gun-makers in</DIV>
<DIV>boucher choral anorexia divest</DIV>
</BODY></HTML>

Re: [Gnuplot-info] automated plotting

[<br...@ph...>]

pau wrote:

>> here.  Among other things, it causes each data file to be gunzipped 
>> *three* times, instead of twice.
> 
> why three? sorry, I think I'm too tired tonight...

Read "help replot".

	plot 'foo'
	replot 'bar'

is equivalent to

	plot 'foo'
	plot 'foo', 'bar'

and since you almost certainly don't need the page of output generated 
by the single-file 'plot', it's a waste of CPU cycles to gunzip the file 
for it.

> I guess I should read the manual...

Drop the "I guess", and replace "should" by "must", and you'll get a 
statement closer to the truth.

>> But all of that is a side issue.  The real stumbling stone is this 
>> question:  which of the many programs used by this script: zsh, gnuplot, 
>> zcat or gnuplot, will evaluate the $4 in "{TIME=$4}", and all the other 
>> $<number> thingies further down the line?
> 
> As I said, doing it for a _single_ data file is not problem at all, it just
> works fine... When using the shell script everything is spoiled. 

And what does that tell you?  That it's the shell that expands that $4.
Why shouldn't it?  It expanded $f and $epsfile, too, after all ;-)
Which takes us into the sometimes confusing world of quoting, escaping, 
and variable expansion and how exactly the various tools handle them. 
The easiest way of avoiding that particular shock would be to rip the 
awk stuff out of the gnuplot HERE-script and move it into a stand-alone 
awk script.

Re: [Gnuplot-info] automated plotting

[pau <all...@gm...>]

Hi Hans-Bernhard,

> Erm, I don't think I saw any mention of replot anywhere in this
> conversation.  It's quite counter-productive in for what you're doing 

no, you didn't... sorry maybe it's just my English. Vielleicht lieber auf
Deutsch? I think it's better English
if somebody else is going to read the post.
I just meant: "going back again to the discussion of yesterday about my
problems with gnuplot" :)

> here.  Among other things, it causes each data file to be gunzipped 
> *three* times, instead of twice.

why three? sorry, I think I'm too tired tonight...

> Check out 'help plot' to understand how to plot more than one data set 
> in a single 'plot' command.  Modify pointsize by 'plot' option, rather 
> than by 'set pointsize'.

gosh, I think it's going to take me years... I already found it puzzling the
set pointsize issues and colours etc... I cannot figure out what you're
talking about but I guess I should read the manual...

> But all of that is a side issue.  The real stumbling stone is this 
> question:  which of the many programs used by this script: zsh, gnuplot, 
> zcat or gnuplot, will evaluate the $4 in "{TIME=$4}", and all the other 
> $<number> thingies further down the line?

As I said, doing it for a _single_ data file is not problem at all, it just
works fine... When using the shell script everything is spoiled. I don't
think it's zsh (it's like enhanced ksh). I would say it's gnuplot because
gawk does its work fine but I don't know why!



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Re: [Gnuplot-info] automated plotting

[<br...@ph...>]

pau wrote:

> following the conversation, I now try to use a replot command 

Erm, I don't think I saw any mention of replot anywhere in this
conversation.  It's quite counter-productive in for what you're doing 
here.  Among other things, it causes each data file to be gunzipped 
*three* times, instead of twice.

>     set pointsize 1
>     plot "< zcat $f" using 3:4 with dots lt 8;
>     set pointsize 2;
>     replot "< zcat $f | gawk -v NAME=60001 '/AS/ {TIME=$4} $1==NAME {print
> TIME,$2,$3,$4,$5,$6,$7,$8,$11; exit}'" using 3:4 with points pt 6 lt -1 ;

Check out 'help plot' to understand how to plot more than one data set 
in a single 'plot' command.  Modify pointsize by 'plot' option, rather 
than by 'set pointsize'.

But all of that is a side issue.  The real stumbling stone is this 
question:  which of the many programs used by this script: zsh, gnuplot, 
zcat or gnuplot, will evaluate the $4 in "{TIME=$4}", and all the other 
$<number> thingies further down the line?

Re: [Gnuplot-info] automated plotting

[pau <all...@gm...>]

Hi,

following the conversation, I now try to use a replot command in the script
but whilst the command perfectly works passing it to single data files, in
the script it crashes. 

The problem is that I have to plot the whole data and then plot the row
starting with 60001 because I use a different symbol for it. Therefore I
look in my data files for a particular row starting with 60001. As you can
see below in my script, I do this with gawk. My data files look like
-----------------------------------------
##comment
##comment
45601 value1 value2 etc ...
34210 value1 value2 etc ...
21345 value1 value2 etc ...
.
.
60001 value1 value2 etc ...
34213 value1 value2 etc ...
--------------------------------------------

The row starting with 60001 changes its position in the different data
files, so that I have to gawk it out.

The script is:

-----------------------------------------------------
#!/usr/bin/env zsh

for f in *.asc.gz ; do
  eps_file=`basename $f .asc.gz`.eps

  gnuplot <<EOF
    unset key
    set xrange [-15:15]
    set yrange [-15:15]
    set xlabel "X (pc)" font "Helvetica,12"
    set ylabel "Y (pc)" font "Helvetica,12"
    set terminal postscript eps enhanced ; set output "$eps_file"
    set pointsize 1
    plot "< zcat $f" using 3:4 with dots lt 8;
    set pointsize 2;
    replot "< zcat $f | gawk -v NAME=60001 '/AS/ {TIME=$4} $1==NAME {print
TIME,$2,$3,$4,$5,$6,$7,$8,$11; exit}'" using 3:4 with points pt 6 lt -1 ;
    unset output
EOF
done
---------------------------------------------------

(I print more columns that I need but this is not the problem)

When I give gnuplot the commands for a single data file I get what I want;
when I execute the script in the directory with 500 files, I get

--------------------------------------
gawk: /AS/ {TIME=} ==NAME {print TIME,,,,; exit}
gawk:            ^ syntax error
gawk: /AS/ {TIME=} ==NAME {print TIME,,,,; exit}
gawk:              ^ syntax error
gawk: /AS/ {TIME=} ==NAME {print TIME,,,,; exit}
gawk:                                 ^ syntax error
gawk: /AS/ {TIME=} ==NAME {print TIME,,,,; exit}
gawk:                                  ^ syntax error
gawk: /AS/ {TIME=} ==NAME {print TIME,,,,; exit}
gawk:                                   ^ syntax error
gawk: /AS/ {TIME=} ==NAME {print TIME,,,,; exit}
gawk:                                    ^ syntax error

zcat: stdout: Broken pipe

gnuplot> plot "< zcat Splotch4_0010_part.asc.gz" using 3:4 with dots lt 8,
"< zcat Splotch4_0010_part.asc.gz | gawk -v NAME=60001 '/AS/ {TIME=} ==NAME
{print TIME,,,,; exit}'" using 3:4 with points pt 6 lt -1 ;
                                                                       ^
         line 0: no data point found in specified file
------------------------------------------

and so on and so forth...

Can anybody help me?

Thanks in any case
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Re: [Gnuplot-info] plot rows instead of column

[<br...@ph...>]

marco_k2 wrote:
> Can I plot the data written in rows ?

Generally not.  But if it's actually a matrix of values, then you can. 
See 'help matrix'.