gnuplot-info — For questions and discussion about gnuplot

Re: [Gnuplot-info] gnuplot xtic question

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

Jonathan Lynch wrote:

> There are potentially ten data points in the space of a second. If i
> express time in the format 16:19:25.941980 the graph is inaccurate
> because gnuplot does not support fractions of a second due to using the
> tm structure.

It'll only be inaccurate if a second is still wider than one pixel on 
the actual output format.  Whether that's the case depends on the output 
format, and the length of the interval you have measurements for.

> So Im going to stick to plotting the floating point data. Gnuplot
> generates tics on the x-axis and labels them. What is the algorithm
> where gnuplot calculates where the tics should be?

It's complicated.  The general scheme is: "divide the range into
intervals of 'nice' length, such that there are between 5 and 10 of them"

> I could write a C program to parse through the data file and generate a
> file with gnuplot commands. if i knew exactly where the tics were going
> to be I could put some tics manually eg.
> set xtics ("16:19:25",58765.0, 16:19:30",58770.0) and so on.

Why do you think you have to know the tick placement for that?  This 
command will override the automatically placed tick positions, so it 
doesn't matter where they would have gone.

Re: [Gnuplot-info] (no subject)

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

Fiorenzo Salvatorelli wrote:
> Dear Collegue:
> I am using the follwwoing code to plot the surface data below:
> How can I interpolate between the data, such to obtain a smooth colored 
> surface plot ??

	set dgrid3d

would do that (with some parameters for you to choose).   I generally 
advise against it.   Plotting data smoother than it actually is 
essentially consitutes a lie to the reader.

[Gnuplot-info] gnuplot xtic question

[Jonathan L. <jl...@fr...>]

I have data as follows which I want to plot in gnuplot. The first column
has floating point data which corresponds to the time of day in seconds
with microsecond precision. eg 58765.941980 corresponds to
16:19:25.941980. (hours:mins:sec.micro). The 2nd column corresponds to
network latency in microseconds.

58765.941980    0.151529
58766.547128    0.151253
58766.649092    0.135645
58766.751071    0.101977
58766.853054    0.113067
58766.955028    0.141189
58767.715886    0.154117
58767.817853    0.156928
58767.919834    0.146146
58768.021811    0.114410

There are potentially ten data points in the space of a second. If i
express time in the format 16:19:25.941980 the graph is inaccurate
because gnuplot does not support fractions of a second due to using the
tm structure.

So Im going to stick to plotting the floating point data. Gnuplot
generates tics on the x-axis and labels them. What is the algorithm
where gnuplot calculates where the tics should be?

I could write a C program to parse through the data file and generate a
file with gnuplot commands. if i knew exactly where the tics were going
to be I could put some tics manually eg.
set xtics ("16:19:25",58765.0, 16:19:30",58770.0) and so on. So that the
X axis would have labels with time values.

So my question again is 
What is the algorithm where gnuplot calculates where the tics for
floating point data on the x-axis should be?

I would appreciate and replys 
Jonathan Lynch

[Gnuplot-info] (no subject)

[Fiorenzo S. <fsa...@ag...>]

Dear Collegue:
I am using the follwwoing code to plot the surface data below:
How can I interpolate between the data, such to obtain a smooth colored 
surface plot ??
Thanks a lot,
Fiorenzo

___________________________
set view map
set contour

set style data pm3d
set pm3d map
set pm3d at b
set cntrparam bspline

set cbrange [0.3:0.4]
set ticslevel 1
set isosample 100,100
set key 130, 130

splot "dati.dat" using 1:2:3
________________________________

#x	y	wc
50	10	0.349000007
100	10	0.305999994
50	30	0.370999992
100	30	0.375
50	60	0.372999996
100	60	0.351000011
50	100	0.342000008
100	100	0.354000002

[Gnuplot-info] controlling significant figures from "print" command

[Mike L. <my...@ne...>]

Gentlemen,

Along with graph plotting, I use the "print command" to get numerical
outputs.  The output is always in 15 significant figures,  and 5 would be
much better for me.

Since gnuplot seems to be built on C language, is there any kind of floating
point command that would limit the printout to 5 significant figures?

Thanks much, and keep up the good work.

Sincerely,

Mike L.
Brooklyn, NY

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Re: [Gnuplot-info] weird problem with gnupot 4.0

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

abhijit wrote:

> I am facing a very weird problem. I wanted to have a graph plotted by
> gnuplot on a webpage. I used gnuplot 4.0 and the graph plotted using
> “set terminal gif” would plot a graph, but could not be viewed on
> internet explorer. 

Why not?  How did it fail?  Did you inspect it with less secretive tools 
than IE?

Did you check for error messages from the script generating it?  Is that 
the windows GUI version of gnuplot you're using to build it, or some 
other gnuplot binary package?

> I aiso tried setting terminal to png, but it did not help.

How so?

[Gnuplot-info] weird problem with gnupot 4.0

[abhijit <pa...@da...>]

Hi,
 
I am facing a very weird problem. I wanted to have a graph plotted by
gnuplot on a webpage. I used gnuplot 4.0 and the graph plotted using
"set terminal gif" would plot a graph, but could not be viewed on
internet explorer. So I plotted the graph using gnuplot 3.7. This graph
plotted using the earlier version, could be viewed using internet
explorer. However I would like to use gnuplot 4.0 only.  
I aiso tried setting terminal to png, but it did not help.  
Can anyone shed some light on this so that graph plotted using gnuplot
4.0 can be viewed on internet explorer. 
 
Abhi

Re: [Gnuplot-info] aiuto visualizzazione grafici

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

Gionny libero wrote:
> vi spiego il mio problema
> ho un file prova.txt in cui ho varie colonne da graficare

I'll try to guess what it might have been you were asking.  But next 
time, please do consider asking in English --- makes it a lot more 
likely that we understand you.

> Sono in windows e uso cygwin per eseguire gnuplot

Which version of gnuplot, and which build (wgnuplot, wgnuplot_pipe, 
gnuplot)?  It's probably best if you just send us the entire text 
printed by "show version long".

> faccio : plot [*:*] [*:*] 'prova.txt' using 1:2 t 'titolografico' w l
> poi: save 'prova.gnu'
> e: load 'prova.gnu'
> a questo punto mi da un errore che nn so cos'è: kpsexpand: not found

That error message comes from your Cygwin TeX installation, not from 
gnuplot.  Gnuplot tries to set up a font search path, and uses the 
command 'kpsewhich' to enquire TeX's configuration about it.  For some 
reason most likely not related to gnuplot, this fails.

[Gnuplot-info] aiuto visualizzazione grafici

[Gionny l. <blu...@li...>]

vi spiego il mio problema
ho un file prova.txt in cui ho varie colonne da graficare

Sono in windows e uso cygwin per eseguire gnuplot
faccio : plot [*:*] [*:*] 'prova.txt' using 1:2 t 'titolografico' w l
poi: save 'prova.gnu'
e: load 'prova.gnu'
a questo punto mi da un errore che nn so cos'=E8: kpsexpand: not found

sapreste aiutarmi?
grazie mille

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Re: [Gnuplot-info] Dashed lines like http://gnuplot.sourceforge.net/demo_4.1/dashcolor.html

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

Bert Baesjou wrote:
> Hans-Bernhard Bröker wrote:
>>Bert Baesjou wrote:

>>Hold it right there.  No, you almost certainly don't want to use PNG as
>>the file format of a plot that'll go to the printer eventually.  Use a
>>vector file format, like PostScript, SVG, PDF or CGM, not a pixel-based
>>one.
> 
> You sure are right here!

Then why don't you heed that advice?  Why still insist on sticking with 
the PNG driver?

> I used "set terminal png font "arial" 8 transparent size 420,320" which
> the demo site claims to have used to generate all of the demo's. 

PNG is a very special case --- there are two quite separate drivers that 
can be compiled in to become "set terminal png".  They have different 
capabilities.

 > But still no luck..... SVG also gives NO dashed lines.

So pick another driver.  Or convince someone to implement dashing for 
the existing SVG driver.

Re: [Gnuplot-info] Dashed lines like http://gnuplot.sourceforge.net/demo_4.1/dashcolor.html

[Bert B. <b.b...@st...>]

Hans-Bernhard Br=F6ker wrote:
> Bert Baesjou wrote:
>=20
>> http://beerserv.student.utwente.nl/pics/hybla_vs_reno_8ms_NG_example.p=
ng
>>  becomes very obscure when printed
>=20
>=20
> Hold it right there.  No, you almost certainly don't want to use PNG as
> the file format of a plot that'll go to the printer eventually.  Use a
> vector file format, like PostScript, SVG, PDF or CGM, not a pixel-based
> one.
You sure are right here!

>=20
>> in B/W and I was thinking it might come out better with dashed and
>> undashed lines.
>=20
>=20
> Check the help for the terminal you'll actually use, and watch out for =
a
> 'dashed' option.
>=20
>=20
I used "set terminal png font "arial" 8 transparent size 420,320" which
the demo site claims to have used to generate all of the demo's. But
still no luck..... SVG also gives NO dashed lines.
Any other ideas, or should I hand in a colour only version...

Thanks in advance,
	Bert

Re: [Gnuplot-info] Online Graphs

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

Matt Kopeck wrote:
> Is it possible to plot a gnuplot graph in any other way than having it
> displayed in an X-style window?  

Of course

	help set term
	help set output

should get you going.

Re: [Gnuplot-info] coloring graphs

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

Even Karl wrote:

> I try to draw a graph with a grey background just inside the xrange
> and the yrange. It appears that it is not directly possible with
> gnuplot.

Correct.

> It works but the grid and the tics I would like to keep in disappear

Please rephrase this to fix the language problem: "keep in disappear" 
doesn't mean anything.

> Is there any solution (that is to say obtain a grey background and
> grid and tics) ?

Watch out for 'back/front' options in the help of the commands you're using.

Re: [Gnuplot-info] Dashed lines like http://gnuplot.sourceforge.net/demo_4.1/dashcolor.html

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

Bert Baesjou wrote:
> http://beerserv.student.utwente.nl/pics/hybla_vs_reno_8ms_NG_example.png
>  becomes very obscure when printed

Hold it right there.  No, you almost certainly don't want to use PNG as
the file format of a plot that'll go to the printer eventually.  Use a
vector file format, like PostScript, SVG, PDF or CGM, not a pixel-based one.

> in B/W and I was thinking it might come out better with dashed and
> undashed lines.

Check the help for the terminal you'll actually use, and watch out for a 
'dashed' option.

Re: [Gnuplot-info] can't complement file name

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

Liu Qi wrote:

> It seems that I can't use key tab to complement the file name in
> command of  "load" or "using" which I could use in the version 3.7

That has nothing to do with the version of gnuplot, but a lot with who 
built your binary, and how exactly they did that.  Your new binary fails 
to have the GNU libreadline usage compiled in --- check this with the 
person who made that binary.

[Gnuplot-info] Online Graphs

[Matt K. <mk...@sg...>]

Hi,

Is it possible to plot a gnuplot graph in any other way than having it
displayed in an X-style window?  I would like to take a graph plotted by
gnuplot and have it on a webpage.  Has anyone ever done this before? 
Should I look at the perl module for gnuplot?  Should I use gnuplot? 
Can anyone shed some light on this so I can try to make some progress.

Thanks in advance,
Matt
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[Gnuplot-info] coloring graphs

[Even K. <kar...@in...>]

Hello,

I try to draw a graph with a grey background just inside the xrange and the
yrange.
It appears that it is not directly possible with gnuplot.

So, in order to reach my goal I  have tryed, as an example, the following
request :

set yrange [0:1]
plot 1 with filledcurve y1=0 lt 9, x*x
 
It works but the grid and the tics I would like to keep in disappear

Is there any solution (that is to say obtain a grey background and grid and
tics) ?  

many many thanks in advance

Karl

[Gnuplot-info] Dashed lines like http://gnuplot.sourceforge.net/demo_4.1/dashcolor.html

[Bert B. <b.b...@st...>]

Hi,
Sorry to spam you for this, but I have a research report waiting to be
handed in and I want to use dashed lines in my plot like  this demo
site: http://gnuplot.sourceforge.net/demo_4.1/dashcolor.html
But it seems my terminal doesn't show dashed lines :S Please help me,
because I need those dashed lines.
http://beerserv.student.utwente.nl/pics/hybla_vs_reno_8ms_NG_example.png
 becomes very obscure when printed in B/W and I was thinking it might
come out better with dashed and undashed lines.

So which terminal type should I set it to? I use gnuplot from CVS (just
installed it). And one other thing, this gnuplot can't manage "tc rgb
"orange"" or any other color
gnuplot> set label 2 'set style line 2 lt 2 lc rgb "orange" lw 2' at
-0.4, -0.35 tc rgb "orange"

         textcolor colorspec not recognized

Maybe this has something to do with it?

Thanx in advance

	Bert

BTW, I'm not subscribed or anything to this mailing list, so please
reply directly or CC to me.

[Gnuplot-info] =?gb2312?B?Y2FuJ3QgY29tcGxlbWVudCBmaWxlIG5hbWUg?=

[Liu Q. <lq...@us...>]

SXQgc2VlbXMgdGhhdCBJIGNhbid0IHVzZSBrZXkgdGFiJm5ic3A7dG8gY29tcGxlbWVudCB0aGUg
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aWwgU3lzdGVtIAoK

Re: [Gnuplot-info] Windows Version and the -persist Option

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

Tony Richardson wrote:
> The -persist option no longer seems to work for me with the 4.0.0 version
> of gnuplot under Windows.  

Where "no longer" means since when, actually?  What did you change that 
triggered this?

 > At a cmd prompt:
> 
>    echo plot sin(x) | pgnuplot -persist
> 
> The graph appears briefly, before disappearing.  This used to work for me
> under previous gnuplot versions.  

That's a little hard to believe --- according to the changelogs, 
"-persist" was only added in 2004-02, i.e. in the run-up phase to the 
4.0 release.

Anyway, -persist means rather a different thing to the Windows terminal 
than it does on X11, where it originated: in X11, the gnuplot process 
and the X11 window process are separate programs, in Windows they're the 
same one, so we can't stop one and keep only the other running (until 
somebody closes the window).   That's why it was called differently in 
Windows: /noend, which meant the program itself wouldn't stop after 
having read all the scripts (and you could type further commands into 
the console window).

But yes, something is broken in that area.  I can't (easily) cross-check 
it right now.  Please file this as a bug report in our tracker, so it 
doesn't get lost.

Re: [Gnuplot-info] technical assistance

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

Abhishek Tiwary wrote:

> with the work. So basically we have the results with two sets of mean
>  values and accuracy ranges shown using error bars (see the word 
> ducument file). Now I want to use a technique similar to what was 
> done in the attached figure to represent the result as a shaded 
> region (covering the accuracy range) rather than the conventional 
> line with y-error bars plotted in Excel.

That plot style is known as an "error band".  gnuplot until version 4.0
could not possibly support it.  Nowadays, it might actually be able to,
but you have to lend it a hand.  You'll have to plot 3 datasets in
different styles:

1) the experimental data and their errors "with errorbars"
2) the model central value "with lines"
3) the model error region "with filledcurves", and with a specially
    crafted data file.

Otherwise, you'll have to resort to plotting the model "with
boxxyerrorbars", or by doing two additional plots "with lines" at the
upper and lower error limit (and maybe fill in that area in 
postprocessing, possibly even in CorelDraw if you absolutely have to).

[Gnuplot-info] Windows Version and the -persist Option

[Tony R. <ric...@ev...>]

The -persist option no longer seems to work for me with the 4.0.0 version
of gnuplot under Windows.  At a cmd prompt:

   echo plot sin(x) | pgnuplot -persist

The graph appears briefly, before disappearing.  This used to work for me
under previous gnuplot versions.  Looking at the source to pgnuplot, it 
appears
that the -persist option is just passed on to wgnuplot.exe, so I assume that 
the
problem lies there.  Can someone else confirm this problem or is it local to
my setup?  I *think* this is causing me problems getting maxima to create
plots for me.

Tony Richardson

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