gnuplot-info — For questions and discussion about gnuplot

[Gnuplot-info] plotting an arbitrary number of data file columns

[Ben E. <bj...@ai...>]

Hi all.

I would like to use gnuplot to plot a data file with an arbitrary
number of columns, all plotted using 1: and the respective column.  Is
there a way to do this so that my gnuplot command file doesn't need to
know the number of columns in the data file ahead of time?

I've already discovered 'set key autotitle columnhead', so that much
is working nicely.

Thanks, Ben

Re: [Gnuplot-info] pm3d of the matrix with variable row length.

[<v_...@uk...>]

On Tue, 05 Jul 2011 23:45:39 +0200
Hans-Bernhard Bröker <HBB...@t-...> wrote:

> 
>           Matrix does not represent a grid
> 
> And if you think about it, I hope you'll agree that something with 
> variable row lengths, pretty much by definition, is _not_ a matrix.
> 
  You are right of course. But I still need to plot those data and I'd
be happy to get any suggestions or advices on how to do that in my
particular case (with the data I posted in the very beginning of this
thread). Can I use that file without reformatting it into a 3-column
(X, Y, Z) format?

  Thanks
    Vladimir

----- 
 <v_...@uk...>

Re: [Gnuplot-info] pm3d of the matrix with variable row length.

[Hans-Bernhard B. <HBB...@t-...>]

On 05.07.2011 23:26, v_...@uk... wrote:

>    It also turned out that the file 'triangle.dat' isn't in a matrix
> form. It explains why it works. But still, isn't it possible to work
> with a matrix with a variable row lengths?

Apparently not.  gnuplot is quite straight forward about it in its error 
message, too:

          Matrix does not represent a grid

And if you think about it, I hope you'll agree that something with 
variable row lengths, pretty much by definition, is _not_ a matrix.

Re: [Gnuplot-info] pm3d of the matrix with variable row length.

[<v_...@uk...>]

On Tue, 05 Jul 2011 22:30:52 +0200
Hans-Bernhard Bröker <HBB...@t-...> wrote:

> On 05.07.2011 22:24, v_...@uk... wrote:
> 
> >    I thought so too, but it looks like I do not have them. At
> > least, the command
> >      find /usr -name 'triangle.dat' gives nothing.
> 
> That's by no means conclusive proof.  If you built your own gnuplot,
> the demos could be anyway (in the source, or installed in whatever 
> location).  Or your distributor might have decided to put them
> somewhere unexpected (possibly even in a separate package you didn't
> install).
> 
  Well, I implicitly meant that I installed gnuplot in a standard way
using the package manager. And in such cases [almost] everything goes
under the '/usr' directory. Any additional data goes into the
'/usr/share' usually.
  But anyway thank you for the tip about the package manager options.
It did turn out that the Gnuplot demos installation depends on the
configured package manager options. And I had the necessary option
turned off.
  It also turned out that the file 'triangle.dat' isn't in a matrix
form. It explains why it works. But still, isn't it possible to work
with a matrix with a variable row lengths?

> >    By the way, if you have this file on your machine, could you
> > please send it to me?
> 
> I'd rather resolve how it can happen that you don't have it.
> 


----- 
 <v_...@uk...>

Re: [Gnuplot-info] Plotting a heatmap with floating point coordinates

[<v_...@uk...>]

  Hello!

On Tue, 5 Jul 2011 16:09:23 +0100
Durand <du...@gm...> wrote:

> Hi,
> 
> I'm wondering whether it is possible to use gnuplot to plot a heatmap
> from data generated by a simulation. This data uses a float for
> coordinates and gnuplot complains when I use "with image".
> 
  Why don't you use 'with pm3d"? I'm trying to plot something similar
at the moment and 'pm3d' suits my needs quite well. Almost perfect. 
  It even has a wonderful "interpolate" feature which helps to smooth
the rough tile-like plot.

  Regards,
    Vladimir

> The file looks like this:
> 
> 2 160 320
> >
> export
> >
> R Z TEMP
> >
> 1.562500E-02 -4.984375E+00 9.469442E+03
> >
> 4.687500E-02 -4.984375E+00 9.469432E+03
> >
> 7.812500E-02 -4.984375E+00 9.632299E+03
> >
> 1.093750E-01 -4.984375E+00 9.777784E+03
> >
> 1.406250E-01 -4.984375E+00 1.012443E+04
> >
> 1.718750E-01 -4.984375E+00 1.051870E+04
> >
> 2.031250E-01 -4.984375E+00 1.149681E+04
> 
> ...
> 
> 
> With the first two columns being coordinates and the last being the
> temperature at a point. I'm trying to get something like this:
> http://img828.imageshack.us/img828/14/screenshotad.png
> 
> The heatmaps on this page
> http://gnuplot.sourceforge.net/demo/heatmaps.htmlseem to be much lower
> resolution and I'm not really sure what to do so any
> help would be great!
> 
> Thanks
> Durand
> ------------------------------------------------------------------------------
> All of the data generated in your IT infrastructure is seriously
> valuable. Why? It contains a definitive record of application
> performance, security threats, fraudulent activity, and more. Splunk
> takes this data and makes sense of it. IT sense. And common sense.
> http://p.sf.net/sfu/splunk-d2d-c2
> _______________________________________________
> gnuplot-info mailing list
> gnu...@li...
> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
> 


----- 
 <v_...@uk...>

[Gnuplot-info] pm3d of the matrix with variable row length.

[<v_...@uk...>]

  Hello!
  I have the following problem: 

There are some data in a matrix form like this:

2.5 2.5 2.4 2.4 2.4 2.4 2.4 2.4
2.4 2.4 2.3 2.3 2.3 2.3 2.3
2.3 2.3 2.1 2.1 2.1 2.1 2.2
2.2 2.1 1.9 1.9 1.9 1.9 2.1
2.1 2.1 1.7 1.7 1.7 1.7 2.0 2.3
2.1 2.0 1.6 1.6 1.6 1.6 1.9
2.0 1.9 1.5 1.5 1.5 1.5 1.8
1.9 1.8 1.4 1.4 1.4 1.5 1.7 2.2
1.8 1.7 1.4 1.4 1.4 1.5 1.7

As one can see, there are strings with different number of columns. The
Gnuplot manual says that "pm3d ... allows plotting gridded as well as
non-gridded data without preprocessing, even when the data scans do not
have the same number of points." So I've tried to do it in the several
ways, but failed.
  The last command I tried to use looks like this:

gnuplot -e 'set terminal png; set pm3d map flush begin; set
palette color negative; splot "mydata.txt" matrix with pm3d'

I believe it is the part "flush begin" that must help plotting a matrix
with different number of columns in the rows, isn't it?

If someone has successfully plotted a matrix similar to mine, please
give your example.

P.S. By the way, there is an example of what I want to get here:
http://gnuplot.sourceforge.net/demo/pm3d.html 
It is called "Datafile with different nb of points in scans; pm3d flush
begin".

  Thank you.
    Vladimir

----- 
 <v_...@uk...>

[Gnuplot-info] Plotting a heatmap with floating point coordinates

[Durand <du...@gm...>]

Hi,

I'm wondering whether it is possible to use gnuplot to plot a heatmap from
data generated by a simulation. This data uses a float for coordinates and
gnuplot complains when I use "with image".

The file looks like this:

2 160 320
>
export
>
R Z TEMP
>
1.562500E-02 -4.984375E+00 9.469442E+03
>
4.687500E-02 -4.984375E+00 9.469432E+03
>
7.812500E-02 -4.984375E+00 9.632299E+03
>
1.093750E-01 -4.984375E+00 9.777784E+03
>
1.406250E-01 -4.984375E+00 1.012443E+04
>
1.718750E-01 -4.984375E+00 1.051870E+04
>
2.031250E-01 -4.984375E+00 1.149681E+04

...


With the first two columns being coordinates and the last being the
temperature at a point. I'm trying to get something like this:
http://img828.imageshack.us/img828/14/screenshotad.png

The heatmaps on this page
http://gnuplot.sourceforge.net/demo/heatmaps.htmlseem to be much lower
resolution and I'm not really sure what to do so any
help would be great!

Thanks
Durand

[Gnuplot-info] Hide contour behind pm3d surface and grid on the xz and yz planes

[Fastgalix <gre...@ep...>]

Hi gnuplot gurus,

I am sure this has been answered already but I couldn't find it; please
forgive me for asking:

I have a data set I plot with pm3d. I defined the line styles in order to
change the color of the contour lines but i have troubles in hiding these
contours when the surface is "in front" of them making the picture somewhat
confusing (see the pic).
I tried with eg.:
  set pm3d at s hidden3d 3
but as far as I understood, this only is for drawing the data points surface
not the contours; besides I do not want the my surface plotted with points
or lines, I just want the pm3d surface
and also with:
  set  hidden3d
But I think this only works for axis and grid right ?

I would also like to be able to draw a grid on the xz and yz planes at each
xtics and ytics respectively (the set grid xtics ytics ztics plots the grid
only on the ztics for these planes)... This is secondary and I didn't do an
extensive search on that though :blush:

Thanks a lot for your help



http://old.nabble.com/file/p31987266/plot.gplt.jpeg 

The code to generate the eps the picture is based on is :

reset
set term post color eps enhanced size 10,7 solid
set out 'plot.gplt.eps'
set xrange [4:21.5]
set yrange [-0.6:0.3]
set zrange [0:2.3]
set cbrange [0:2.3]
set grid xtics ytics ztics
set contour surf 
set cntrparam lev inc 0,0.1,2.25
set sty line  1 lt -1
set sty line  2 lt -1
#    set pm3d at s hidden3d 3
set sty line  3 lt -1
set sty line  4 lt -1
set sty line  5 lt -1
set sty line  6 lt -1
set sty line  7 lt -1
set sty line  8 lt -1
set sty line  9 lt -1
set sty line 10 lt -1
set sty line 11 lt -1
set sty line 12 lt -1
set sty line 13 lt -1
set sty line 14 lt -1
set sty line 15 lt -1
set sty line 16 lt -1
set sty line 17 lt -1
set sty line 18 lt -1
set sty line 19 lt -1
set sty line 20 lt -1
set sty line 21 lt -1
set sty line 22 lt -1
set sty line 23 lt -1
set sty line 24 lt -1
set sty line 25 lt -1
set sty line 26 lt -1
set sty line 27 lt -1
set style increment user

set view 37,176
set view 47,148

#unset hidden3d
#unset surf

unset key
set palette defined
sp \
  'fes.dat' u 1:2:($3+3.7)w pm3d 


-- 
View this message in context: http://old.nabble.com/Hide-contour-behind-pm3d-surface-and-grid-on-the-xz-and-yz-planes-tp31987266p31987266.html
Sent from the Gnuplot - User mailing list archive at Nabble.com.

Re: [Gnuplot-info] efficient history search

[Jefferson S. E. P. <st...@gm...>]

Thx a lot, Hernán.

I didn't know of the term 'readline', now I could google the problem
properly. :)

So you're right, it's by compiling from source, with the appropriate
option, that the problem is solved (something to do with licenses in
debian and, by extension, ubuntu, that prevent them from including
readline in the default installation, see
/usr/share/doc/gnuplot/README.Debian - as pointed out in
http://lists.debian.org/debian-science/2005/08/msg00081.html ).

Apart from that, there is a (relatively) quick workarond: rlwrap (
http://ubuntuforums.org/archive/index.php/t-102524.html ). After
installing rlwrap, for it's not included by default on ubuntu, I get
the missing readline functionalities by running
rlwrap -acN gnuplot
(no guarantees about the options, but probably at least '-c',
--complete-filenames, should be there).

For my needs (efficient search) it is important to notice that those
bindings I mentioned in the initial post,
bind '"\e[5~": history-search-backward'
bind '"\e[6~": history-search-forward'
in the .bashrc, doesn't seem to be recognized by rlwrap, even it the
option  -t bash  (didn't try it much, though, maybe it's possible to
make it work somehow), but they do work when the equivalent lines in
the
/etc/inputrc
were uncommented.

Last, but not least, gnuplot seems to store white spaces in its
history file as "\040"s, which are not retrieved any more as white
spaces when using gnuplot with rlwrap, but that can be easily solved
by substituting \040 by white spaces in the file. Good news is that
gnuplot used without rlwrap doesn't seem to have problems reading the
modified file, not so good news is that then (i.e., using gnuplot
without rlwrap) the white spaces in the file will be back to \040's...

Cheers,
Stafusa


On Sun, Jul 3, 2011 at 6:22 AM, Hernán Gonzalo Asorey <as...@gm...> wrote:
> Hi,
> Gnuplot 4.4 binaries included in ubuntu do not support full readline
> features. I always manage that issue by installing gnuplot from source.
> Download sources from www.gnuplot.info
> Compile and link it using gnu readline option:
> cd gnuplot
> ./configure --with-readline=gnu
> make
> sudo make install
> this should solve your problems. I don't know if there are other way to fix
> the original gnuplot binaries distributed with ubuntu.
> Cheers,
> Hernán
>

Re: [Gnuplot-info] efficient history search

[Hernán G. A. <as...@gm...>]

Hi,

Gnuplot 4.4 binaries included in ubuntu do not support full readline
features. I always manage that issue by installing gnuplot from source.
Download sources from www.gnuplot.info
Compile and link it using gnu readline option:

cd gnuplot
./configure --with-readline=gnu
make
sudo make install

this should solve your problems. I don't know if there are other way to fix
the original gnuplot binaries distributed with ubuntu.

Cheers,

Hernán

On Sat, Jul 2, 2011 at 20:17, stafusa <st...@gm...> wrote:

>
>
> Wizard847 wrote:
> >
> > I am experiencing the same problem. In addition, with the new version of
> > gnuplot for ubuntu I also lost the possibility to use "tab" button to
> > complete the file names.
> >
>
> Hey. Just tested and this feature actually does work for me. But I also
> would think that the solutions for both problems should be linked.
>
> Cheers.
> --
> View this message in context:
> http://old.nabble.com/efficient-history-search-tp31964384p31981527.html
> Sent from the Gnuplot - User mailing list archive at Nabble.com.
>
>
>
> ------------------------------------------------------------------------------
> All of the data generated in your IT infrastructure is seriously valuable.
> Why? It contains a definitive record of application performance, security
> threats, fraudulent activity, and more. Splunk takes this data and makes
> sense of it. IT sense. And common sense.
> http://p.sf.net/sfu/splunk-d2d-c2
> _______________________________________________
> gnuplot-info mailing list
> gnu...@li...
> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
>

Re: [Gnuplot-info] efficient history search

[stafusa <st...@gm...>]

Wizard847 wrote:
> 
> I am experiencing the same problem. In addition, with the new version of
> gnuplot for ubuntu I also lost the possibility to use "tab" button to
> complete the file names.
> 

Hey. Just tested and this feature actually does work for me. But I also
would think that the solutions for both problems should be linked.

Cheers.
-- 
View this message in context: http://old.nabble.com/efficient-history-search-tp31964384p31981527.html
Sent from the Gnuplot - User mailing list archive at Nabble.com.

Re: [Gnuplot-info] efficient history search

[Gabriele C. <wiz...@gm...>]

Hi stafusa,

I am experiencing the same problem. In addition, with the new version of
gnuplot for ubuntu I also lost the possibility to use "tab" button to
complete the file names.
This is really hard to explain.
Has anybody a solution?

Cheers,
Gabriele

2011/6/30 stafusa <st...@gm...>

>
> Hello,
>
> in bash you can type, say, "rm" and search the shell history for entries
> beginning with "rm" by simply pressing PgUp, PgDn. That is very useful, and
> all you have to do is to add, in your .bashrc:
> bind '"\e[5~": history-search-backward'
> bind '"\e[6~": history-search-forward'
>
> At work (Suse, with gnuplot 4.4 patch 0) I have the same functionality in
> gnuplot, but not in my personal computer (Ubuntu, gnuplot 4.4 patch 2). I
> didn't find anything in the .gnuplot or similar and googling for quite a
> while didn't turn out anything useful.
>
> Does someone know how to get this feature to work in gnuplot?
>
> Thx in advance,
> Stafusa
>
> --
> View this message in context:
> http://old.nabble.com/efficient-history-search-tp31964384p31964384.html
> Sent from the Gnuplot - User mailing list archive at Nabble.com.
>
>
>
> ------------------------------------------------------------------------------
> All of the data generated in your IT infrastructure is seriously valuable.
> Why? It contains a definitive record of application performance, security
> threats, fraudulent activity, and more. Splunk takes this data and makes
> sense of it. IT sense. And common sense.
> http://p.sf.net/sfu/splunk-d2d-c2
> _______________________________________________
> gnuplot-info mailing list
> gnu...@li...
> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
>

Re: [Gnuplot-info] gnuplot with two-way pipe

[Zoltán <zv...@gm...>]

> 
> Why would there be a need to wait for anything?  You either get your 
> "OK" message string, or you get an error message.  Either one of those 
> signifies that the previous command is no finished.

Because errors don't have an unequivocal signature, nor do they have a defined
length. Also, if I say

    fit f(x) 'foo.dat' u 1:2 via a, b
    plot f(x), 'foo.dat' u 1:3
    print "OK"

the fit command will produce a lot of lines, and the plot command can still very
will fail, so there is absolutely no telling how long the output is. I really
don't see how one could determine how long one has to read. 
Zoltán

Re: [Gnuplot-info] gnuplot with two-way pipe

[Hans-Bernhard B. <HBB...@t-...>]

On 02.07.2011 20:03, Zoltán wrote:

> which would send back the string "TRANSMISSION_OVER", whenever the command
> executed properly. However, this works only, if there are no errors. If there is
> an error, gnuplot sends back the error message, but not the sought-after string.
> Obviously, the user would not know how many lines are on the pipe, so it is not
> clear how long one is supposed to wait for gnuplot.

Why would there be a need to wait for anything?  You either get your 
"OK" message string, or you get an error message.  Either one of those 
signifies that the previous command is no finished.

Re: [Gnuplot-info] Question regarding placement of cbtics

[Christian S. <csc...@uo...>]

Thank you very much! However, I found that I also needed to add:

set cbrange [0:GPVAL_CB_MAX]

v_max did not appear unless that was there, too.

Thank you again!

Christian


----- Original Message -----
> plot twice, 1st time to e.g. the alphanumeric terminal. use the value
> of the variable 'GPVAL_CB_MAX' which is set during the 1st plot.
> then plot again:
> 
> set output
> set term push
> set term dumb
> plot ...
> set cbtics ('$0$' 0, '$v_{\text{max}}$' GPVAL_CB_MAX)
> set term pop
> set output ...
> replot
> 
> 
> Christian Schroeder-7 wrote:
> >
> > Hi,
> >
> > Thanks for reading my post. I'm looking for some "how to" advice for
> > the
> > following context:
> >
> > I have an array of 64x64 data points that I'm plotting "with image",
> > in
> > color, using epslatex. I know that the smallest values in my data
> > are 0,
> > and that there are many of these "0" pixels. I do not, however, know
> > in
> > advance what my data set's maximum value is. I'd like to plot this
> > data
> > using the auto-generated color-box, but in a relative fashion,
> > without
> > actually ascribing particular values to particular colors. In fact,
> > I'd
> > only like to have two cbtics: one at zero and one at the maximum
> > value of
> > the data set. Right now, for example, I'm using the following
> > command:
> >
> > set cbtics ('$0$' 0, '$v_{\text{max}}$' 2.405e4)
> >
> > where "2.405e4" is the maximum value of one particular data point -
> > the
> > largest value of all the data points - that I had to look up in the
> > data
> > set in advance. This value will, of course, be different for another
> > data
> > set, meaning I'd have to look it up again each time I plot a
> > different
> > data set.
> >
> > Is there any way that I can get gnuplot to put my "v_max" color-box
> > label
> > at the (unknown in advance) maximum value of my data set? The more
> > painful
> > way for me to approach this problem is to normalize my data, a step
> > I'd
> > prefer not to have to take. If there's a really obvious answer to
> > this, I
> > apologize for asking the question; however, I did spend some time
> > looking
> > around to no avail!
> >
> > Thanks again for your time!
> >
> > Christian
> >
> > ------------------------------------------------------------------------------
> > All of the data generated in your IT infrastructure is seriously
> > valuable.
> > Why? It contains a definitive record of application performance,
> > security
> > threats, fraudulent activity, and more. Splunk takes this data and
> > makes
> > sense of it. IT sense. And common sense.
> > http://p.sf.net/sfu/splunk-d2d-c2
> > _______________________________________________
> > gnuplot-info mailing list
> > gnu...@li...
> > https://lists.sourceforge.net/lists/listinfo/gnuplot-info
> >
> >
> 
> --
> View this message in context:
> http://old.nabble.com/Question-regarding-placement-of-cbtics-tp31980544p31980741.html
> Sent from the Gnuplot - User mailing list archive at Nabble.com.
> 
> 
> ------------------------------------------------------------------------------
> All of the data generated in your IT infrastructure is seriously
> valuable.
> Why? It contains a definitive record of application performance,
> security
> threats, fraudulent activity, and more. Splunk takes this data and
> makes
> sense of it. IT sense. And common sense.
> http://p.sf.net/sfu/splunk-d2d-c2
> _______________________________________________
> gnuplot-info mailing list
> gnu...@li...
> https://lists.sourceforge.net/lists/listinfo/gnuplot-info

-- 
__________________________________________________
Christian B. K. Schroeder, MSc, PPhys (Physics)
PhD Candidate, Dynamic MRI Microscopy (DOI: 10.1103/PhysRevLett.106.046001)
University of Guelph Department of Physics           "Yes; I can do that."
Stone Road
Guelph ON N1G 2W1
CANADA
Fax:   (519)836-9967

Re: [Gnuplot-info] Question regarding placement of cbtics

[Thomas S. <t.s...@fz...>]

plot twice, 1st time to e.g. the alphanumeric terminal. use the value
of the variable 'GPVAL_CB_MAX' which is set during the 1st plot.
then plot again:

set output
set term push
set term dumb
plot ...
set cbtics ('$0$' 0, '$v_{\text{max}}$' GPVAL_CB_MAX)
set term pop
set output ...
replot


Christian Schroeder-7 wrote:
> 
> Hi,
> 
> Thanks for reading my post. I'm looking for some "how to" advice for the
> following context:
> 
> I have an array of 64x64 data points that I'm plotting "with image", in
> color, using epslatex. I know that the smallest values in my data are 0,
> and that there are many of these "0" pixels. I do not, however, know in
> advance what my data set's maximum value is. I'd like to plot this data
> using the auto-generated color-box, but in a relative fashion, without
> actually ascribing particular values to particular colors. In fact, I'd
> only like to have two cbtics: one at zero and one at the maximum value of
> the data set. Right now, for example, I'm using the following command:
> 
> set cbtics ('$0$' 0, '$v_{\text{max}}$' 2.405e4)
> 
> where "2.405e4" is the maximum value of one particular data point - the
> largest value of all the data points - that I had to look up in the data
> set in advance. This value will, of course, be different for another data
> set, meaning I'd have to look it up again each time I plot a different
> data set.
> 
> Is there any way that I can get gnuplot to put my "v_max" color-box label
> at the (unknown in advance) maximum value of my data set? The more painful
> way for me to approach this problem is to normalize my data, a step I'd
> prefer not to have to take. If there's a really obvious answer to this, I
> apologize for asking the question; however, I did spend some time looking
> around to no avail!
> 
> Thanks again for your time!
> 
> Christian
> 
> ------------------------------------------------------------------------------
> All of the data generated in your IT infrastructure is seriously valuable.
> Why? It contains a definitive record of application performance, security 
> threats, fraudulent activity, and more. Splunk takes this data and makes 
> sense of it. IT sense. And common sense.
> http://p.sf.net/sfu/splunk-d2d-c2
> _______________________________________________
> gnuplot-info mailing list
> gnu...@li...
> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
> 
> 

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[Gnuplot-info] gnuplot with two-way pipe

[Zoltán <zv...@gm...>]

Hi All,

I am trying to call gnuplot from a python session. I have set up a two-way pipe,
and I can both send and receive data from gnuplot. The problem is that this
works only when I know exactly how much data is transmitted by gnuplot, or if
there is some signature that shows that transmission is completed. So, I can
send something like this (in pseudo code)

   plot "foo.dat" with lines
   print "TRANSMISSION_OVER"

which would send back the string "TRANSMISSION_OVER", whenever the command
executed properly. However, this works only, if there are no errors. If there is
an error, gnuplot sends back the error message, but not the sought-after string.
Obviously, the user would not know how many lines are on the pipe, so it is not
clear how long one is supposed to wait for gnuplot. 
My question is whether anyone knows a way of handling this properly. Perhaps, if
gnuplot could return the prompt, even when piped, that could be a solution, but
as far as I see, once gnuplot figures that it is piped, it stripes the prompt of
any print-out.
Thanks,
Zoltán

[Gnuplot-info] Question regarding placement of cbtics

[Christian S. <csc...@uo...>]

Hi,

Thanks for reading my post. I'm looking for some "how to" advice for the following context:

I have an array of 64x64 data points that I'm plotting "with image", in color, using epslatex. I know that the smallest values in my data are 0, and that there are many of these "0" pixels. I do not, however, know in advance what my data set's maximum value is. I'd like to plot this data using the auto-generated color-box, but in a relative fashion, without actually ascribing particular values to particular colors. In fact, I'd only like to have two cbtics: one at zero and one at the maximum value of the data set. Right now, for example, I'm using the following command:

set cbtics ('$0$' 0, '$v_{\text{max}}$' 2.405e4)

where "2.405e4" is the maximum value of one particular data point - the largest value of all the data points - that I had to look up in the data set in advance. This value will, of course, be different for another data set, meaning I'd have to look it up again each time I plot a different data set.

Is there any way that I can get gnuplot to put my "v_max" color-box label at the (unknown in advance) maximum value of my data set? The more painful way for me to approach this problem is to normalize my data, a step I'd prefer not to have to take. If there's a really obvious answer to this, I apologize for asking the question; however, I did spend some time looking around to no avail!

Thanks again for your time!

Christian

Re: [Gnuplot-info] assign fixed color to each Z-level

[sikp <si...@se...>]

Thanks, I have tried, but the result is different :-(:

http://old.nabble.com/file/p31976182/test.png 

My input is data file:  http://old.nabble.com/file/p31976182/data_test.txt
data_test.txt 

I use this command to plot it:
 splot  "data_test.txt" with pm3d

Thanks, Petr
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Re: [Gnuplot-info] assign fixed color to each Z-level

[Thomas S. <t.s...@fz...>]

you could define a color palette with discrete colors:

set cbrange [0:6]
set palette defined (0 "white", 1 "white", 1 "green", 2 "green", 2 "yellow",
3 "yellow", 3 "orange", 4 "orange", 4 "orange-red", 5 "orange-red", 5 "red", 
6 "red")
# have a look at the palette
test palette
pause -1
# do a test plot
splot 3.*(x+y) with pm3d


sikp wrote:
> 
> Hello,
> 
> is it possible to create 3d graph like this in gnuplot?
> 
>  http://old.nabble.com/file/p31971452/desired_graph.png 
> 
> I need fixed color for each Z-level 0-1, 1-2 and so on..
> 
> Thanks, regards,
>  Petr
> 
> 

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Re: [Gnuplot-info] name of current script

[Robbie M. <ro...@ac...>]

Hello Thomas, all

To follow up on my early posting, here is a list of
"GPVAL_[A-Za-z0-9_]*" strings in 4.4.3 codebase.  Some
may be commented out or in conditional code -- I did
not check:

GPVAL_
GPVAL_COMPILE_OPTIONS
GPVAL_DATA
GPVAL_DATA_
GPVAL_ERRMSG
GPVAL_ERRNO
GPVAL_LAST_PLOT
GPVAL_LOAD_FILE
GPVAL_MULTIPLOT
GPVAL_NAME_WINDOWID
GPVAL_NaN
GPVAL_OUTPUT
GPVAL_PATCHLEVEL
GPVAL_PI
GPVAL_PLOT
GPVAL_PWD
GPVAL_SPLOT
GPVAL_TERM
GPVAL_TERMINALS
GPVAL_TERMOPTIONS
GPVAL_TERM_
GPVAL_TERM_WINDOWID
GPVAL_TERM_XMAX
GPVAL_TERM_XMIN
GPVAL_TERM_YMAX
GPVAL_TERM_YMIN
GPVAL_VERSION
GPVAL_VIEW_
GPVAL_VIEW_MAP
GPVAL_VIEW_ROT_X
GPVAL_VIEW_ROT_Z
GPVAL_VIEW_SCALE
GPVAL_VIEW_ZSCALE
GPVAL_X2_MAX
GPVAL_X2_MIN
GPVAL_X_MAX
GPVAL_X_MIN
GPVAL_Y2_MAX
GPVAL_Y2_MIN
GPVAL_Y_MAX
GPVAL_Y_MIN
GPVAL_pi

And here is a list of what is available after simply
opening gnuplot:

$ gnuplot
gnuplot> show variables all

         <edited and sorted>

	GPVAL_COMPILE_OPTIONS = <long list deleted>
	GPVAL_ERRMSG = ""
	GPVAL_ERRNO = 0
	GPVAL_MULTIPLOT = 0
	GPVAL_NaN = NaN
	GPVAL_OUTPUT = ""
	GPVAL_PATCHLEVEL = "3"
	GPVAL_PLOT = 0
	GPVAL_PWD = "/home/robbie/synk/temp"
	GPVAL_SPLOT = 0
	GPVAL_TERM = "wxt"
	GPVAL_TERMINALS = <long list deleted>
	GPVAL_TERMOPTIONS = "0"
	GPVAL_VERSION = 4.4

It would seem the suggestion of GPVAL_FILE would sit
quite well with GPVAL_PWD.

best wishes
Robbie
---
Robbie Morrison
PhD student -- policy-oriented energy system simulation
Technical University of Berlin (TU-Berlin), Germany
University email (redirected) : mor...@ie...
Webmail (preferred)           : ro...@ac...
[from Webmail client]

Re: [Gnuplot-info] name of current script

[Robbie M. <ro...@ac...>]

Hello Thomas, hello all

I guess I was being a bit cryptic about my suggestion
regarding input that was either redirected from 'stdin'
or piped from another command.  In this case,
GPVAL_LOAD_FILE should be assigned "-".  Which suggests
that perhaps GPVAL_FILE would be a better name for this
variable, because 'stdin' is a type of file in the sense it
gets file descriptor 0.

Can I recommend this concept gets developed and added
to the mainline codebase.  Hint!

thanks
Robbie

------------------------------------------------------------
To:          gnu...@li...
Subject:     Re: [Gnuplot-info] name of current script
Message-ID: <319...@ta...>
From:        Thomas Sefzick <t.s...@fz...>
Date:        Tue, 28 Jun 2011 01:42:11 -0700 (PDT)
------------------------------------------------------------

if there is no load file, then GPVAL_LOAD_FILE is
undefined, i.e. not existing, and this can be tested
using the 'exists()' function:

if (exists("GPVAL_LOAD_FILE")) print GPVAL_LOAD_FILE

Robbie Morrison wrote:
>
> Hello all, hi Thomas
>
> I can confirm the patch from Thomas Sefzick (see
> below) works for real files but not for 'stdin'.  The
> patch allows the name of the current script to be
> recovered from within that script.  I suggest the
> patch gets developed a little and transferred to the
> gnuplot mainline.  Can someone therefore cross-post
> this message to the dev list please?  TIA.

[snip]

---
Robbie Morrison
PhD student -- policy-oriented energy system simulation
Technical University of Berlin (TU-Berlin), Germany
University email (redirected) : mor...@ie...
Webmail (preferred)           : ro...@ac...
[from Webmail client]

Re: [Gnuplot-info] splot and x2range

[cédric o. <ced...@gm...>]

All right, by chance, is there a trick to do contour with the plot command.
I actually do not want to have z axis as in 3D plot but only a 2D plot with
cbrange.

2011/6/30 Hans-Bernhard Bröker <HBB...@t-...>

> On 30.06.2011 15:44, cédric ody wrote:
>
>>
>> I would like to put x axis on top of the graph using SPLOT command. Is
>> there
>> such possibility?
>>
>
> No.  3D plots don't support secondary axes.  No x2range, no x2tics.
>
>

[Gnuplot-info] assign fixed color to each Z-level

[sikp <si...@se...>]

Hello,

is it possible to create 3d graph like this in gnuplot?

http://old.nabble.com/file/p31971452/desired_graph.png 

I need fixed color for each Z-level 0-1, 1-2 and so on..

Thanks, regards,
 Petr

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[Gnuplot-info] Fonts in pngcairo enhanced text

[Nunzio L. <nun...@gm...>]

Hi all,

how can I use Bold or Italic fonts in pngcairo with enhanced text.

I would like to do something like

set label 1 "{/Helvetica-Bold Hello}"

I tried but it doesn't work.

Regards,

NL.