gnuplot-info — For questions and discussion about gnuplot

[Gnuplot-info] map view of data matrix with block structure

[Michael L. <M_L...@ho...>]

Hello,

I'm making an image plot ('set view map') of a 27x27 correlation
matrix that has a block diagonal structure. The [1:18,1:18] 
top-left submatrix and the [19:27,19:27] lower-right submatrix are
all positive and closer to +1; the off-diagonal submatricies 
are all negative and closer to -1.  My problem is that on
the boundary gnuplot is interpolating and plotting a 
color that indicates it is near zero. What I want is 
a sharp distinction between the boundaries but nice
color gradients in each submatrix showing the transition
towards +/- 1.  Any help would be much appreciated.

Here's what I've done so far
---
set pm3d
set view map
set size square
set palette model RGB
set noxtics
set noytics

set palette defined (my nice blue to red pallette choice)

splot "cormatrix" matrix with pm3d # for example

set xrange [] reverse
set yrange [] reverse
replot
---

Thanks,
Mike

[Gnuplot-info] VIRUS IN YOUR MAIL / VIRUS IN IHRER MAIL

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Re: [Gnuplot-info] Question about gnuplot

[Hans-Bernhard B. <br...@ph...>]

frederick surzur wrote:
> I would like to use colors for the third column with the "set pm3d" 
> command but it doesn't work.

"Doesn't work" how?  What exactly did you try, what were the results,
and why did you consider them wrong?

As to your data file: you may want to have a look at 'help datafile' to
look up "grid structure", and 'help glossary' to understand some of the
terms used therein.

> I wonder too where I have to put all the "set" commands : in my data
> file or directly in gnuplot interface?

Either at the gnuplot command-line interface, or in a script file which
you "load" from there, or pass to gnuplot as a start-up option.

[Gnuplot-info] Question about gnuplot

[frederick s. <fre...@ya...>]

Hello,
 
I am a french student and I try to use gnuplot with a data file like 
that:
#fichier test
0 0 100 
0 10 90 
0 20 80 
0 30 70 
0 40 60
0 50 50 
0 60 40
0 70 30
0 80 20
0 90 10 
0 100 0
10 0 90
 
I would like to use colors for the third column with the "set pm3d" 
command but it doesn't work.
I wonder too where I have to put all the "set" commands : in my data file or directly in gnuplot interface?
Is anyone can help me please?
 
Thanks
 
frédérick.


		
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Re: [Gnuplot-info] Can't plot simple graph

[Leonardo L. G. <leo...@gm...>]

Thanks a lot, really helps!
 I didn't now about the CD thing at all
Since you said it works, I gotta believe in you.
All that is actually "generated" by my program, so i didn't see that warnin=
g=20
message really, my bad.
 Thanks again!

 On 7/11/05, Hans-Bernhard Broeker <br...@ph...> wrote:=
=20
>=20
> Leonardo Luigi Giacomet wrote:
> > Anyhow, I must plot a graph from a file to a .png, I've got all the=20
> commands
> > right, but it apparently creates a .png file that crashes Windows=20
> Explorer
> > and Internet Explorer.
>=20
> I tried to reproduce your failure using the distributed native Windows
> binary of gnuplot version 4.0.0, but all went nicely. Which means
> whatever the actual problem is, it's related to one of the aspects that
> differ between the box I tested this on, and yours:
>=20
> 1) What version and SP level of Windows (and IE)?
> 2) What version of gnuplot ("show version long" output)?
> 3) The path names you're using are rather excessively long. That may
> contribute to the problem. I used an inline data file, and a very
> short output name in the current working directory.
>=20
> I suggest you try the following modifications to the command script:
>=20
> Instead of
>=20
> > set output
> >=20
> 'H:\homewin\30pcento\FLI_Traffic\Traffic1\Out\relatorios\Images\Throughpu=
t10-
> > 5.png'
>=20
> cd 'h:\homewin\30pcento\FLI_Traffic\Traffic1\Out\relatorios'
> set output 'Images\Throughput10-5.png'
>=20
> By cd'ing to the shared toplevel directory, you keep the remaining
> commands shorter and more legible. So instead of
>=20
> > plot
> >=20
> 'H:\homewin\30pcento\FLI_Traffic\Traffic1\Out\relatorios\dat\GraphThrough=
put10-
> > 5.vloh' using ($1):($2) t "" with linespoints 5 5
>=20
> you can write
>=20
> p 'dat\GraphThroughput10-5.vloh' u ($1):($2) t "" w lp lt 5 pt 5
>=20
> And add a line
>=20
> set output
>=20
> at the end of the script, to close the output file.
>=20
> > And since I'm here, i should also suggest that they warn people that
> > gnuplot won't create the folders for the output file if they doesn't=20
> exist,
>=20
> What do you mean 'suggest that [we] warn'? Look:
>=20
> gnuplot> set out '\doesnt_exist\foo.png'
> ^
> cannot open file; output not changed
>=20
> If you don't get this message, that's because the version of gnuplot
> you're using has no place to put it.
>

Re: [Gnuplot-info] Can't plot simple graph

[Hans-Bernhard B. <br...@ph...>]

Leonardo Luigi Giacomet wrote:
> Anyhow, I must plot a graph from a file to a .png, I've got all the commands 
> right, but it apparently creates a .png file that crashes Windows Explorer 
> and Internet Explorer.

I tried to reproduce your failure using the distributed native Windows 
binary of gnuplot version 4.0.0, but all went nicely. Which means 
whatever the actual problem is, it's related to one of the aspects that 
differ between the box I tested this on, and yours:

1) What version and SP level of Windows (and IE)?
2) What version of gnuplot ("show version long" output)?
3) The path names you're using are rather excessively long.  That may 
contribute to the problem.  I used an inline data file, and a very
short output name in the current working directory.

I suggest you try the following modifications to the command script:

Instead of

> set output 
> 'H:\homewin\30pcento\FLI_Traffic\Traffic1\Out\relatorios\Images\Throughput10-
> 5.png'

cd 'h:\homewin\30pcento\FLI_Traffic\Traffic1\Out\relatorios'
set output 'Images\Throughput10-5.png'

By cd'ing to the shared toplevel directory, you keep the remaining
commands shorter and more legible.  So instead of

> plot 
> 'H:\homewin\30pcento\FLI_Traffic\Traffic1\Out\relatorios\dat\GraphThroughput10-
> 5.vloh' using ($1):($2) t "" with linespoints 5 5

you can write

p 'dat\GraphThroughput10-5.vloh' u ($1):($2) t "" w lp lt 5 pt 5

And add a line

set output

at the end of the script, to close the output file.

>  And since I'm here, i should also suggest that they warn people that 
> gnuplot won't create the folders for the output file if they doesn't exist, 

What do you mean 'suggest that [we] warn'?  Look:

gnuplot> set out '\doesnt_exist\foo.png'
                                         ^
          cannot open file; output not changed

If you don't get this message, that's because the version of gnuplot 
you're using has no place to put it.

[Gnuplot-info] Can't plot simple graph

[Leonardo L. G. <leo...@gm...>]

Hello, I'm new user to gnuplot, so far I've thanked god it exists several=
=20
times.
Anyhow, I must plot a graph from a file to a .png, I've got all the command=
s=20
right, but it apparently creates a .png file that crashes Windows Explorer=
=20
and Internet Explorer.
Here are the values that generated such graph:
 29.94011976047904 32.0
30.120481927710845 16.0
30.303030303030305 2.0
 They are exactly like that in the source file, I have no idea what's going=
=20
on, is it because there are too many numbers after the dot thing? If then,=
=20
what's the maximum i can put? (It did generate files with that much numbers=
=20
after the dot in previous occasions)
I'm trying to know why that happens, so far I've figured it isn't lack of=
=20
disk space, nor previous files conflicts. Please help me out here...
here are the exact commands I used for that, the file it calls, is the one =
I=20
described just seconds ago.
 reset
set terminal png medium size 600,400
set output=20
'H:\homewin\30pcento\FLI_Traffic\Traffic1\Out\relatorios\Images\Throughput1=
0-
5.png'
set title "Latency Distribution Origin =3D 10 Destination =3D 5"
set xlabel "Throughput"
set ylabel "Number of packets"
plot=20
'H:\homewin\30pcento\FLI_Traffic\Traffic1\Out\relatorios\dat\GraphThroughpu=
t10-
5.vloh' using ($1):($2) t "" with linespoints 5 5
 And since I'm here, i should also suggest that they warn people that=20
gnuplot won't create the folders for the output file if they doesn't exist,=
=20
thus, won't create the file at all.
  Thanks for the attention!

[Gnuplot-info] Banned file: your_text.pif in mail from you

[MAILER D. <>]

QkFOTkVEIEZJTEVOQU1FIEFMRVJUCgpZb3VyIG1lc3NhZ2UgdG86IG1hcmt1
cy5rZXJuQG1lc3NlLmNoCndhcyBibG9ja2VkIGJ5IG91ciBTcGFtIEZpcmV3
YWxsLiBUaGUgZW1haWwgeW91IHNlbnQgd2l0aCB0aGUgZm9sbG93aW5nIHN1
YmplY3QgaGFzIE5PVCBCRUVOIERFTElWRVJFRDoKClN1YmplY3Q6IFJlOiBZ
b3VyIHRleHQKCkFuIGF0dGFjaG1lbnQgaW4gdGhhdCBtYWlsIHdhcyBvZiBh
IGZpbGUgdHlwZSB0aGF0IHRoZSBTcGFtIEZpcmV3YWxsIGlzIHNldCB0byBi
bG9jay4KCgo=

Re: [Gnuplot-info] polygons (was: no subject)

[Hans-Bernhard B. <br...@ph...>]

Ralf Juengling wrote:

> The output of the "test" command features a filled polygon.
> This suggests that plotting polygons (filled or unfilled)
> is supported by gnuplot. However, the gnuplot documentation
> doesn't tell how to do it. Is there an easy way to plot
> filled polygons?

Not as such.  Filled polygons are used by the pm3d and filledcurves 
plotting styles.  Unfilled polygons can always be composed of arrows, or 
by plotting a closed sequence of vertices from a datafile "with lines".

[Gnuplot-info] (no subject)

[Ralf J. <jue...@cs...>]

Hi,

The output of the "test" command features a filled polygon.
This suggests that plotting polygons (filled or unfilled)
is supported by gnuplot. However, the gnuplot documentation
doesn't tell how to do it. Is there an easy way to plot
filled polygons?

Thanks,
Ralf

Re: [Gnuplot-info] x-axis settings

[Hans-Bernhard B. <br...@ph...>]

Matt Kopeck wrote:
> gnuplot> set xdata time
> gnuplot> set timefmt "%H:%M"
> 
> I get the time plotted along the x-axis but I also the date.  Is it
> possible to get the time plotted without the date?

	set format x

accordingly.

RE: [Gnuplot-info] x-axis settings

[Eric H. <eh...@mi...>]

Matt,

If I am not mistaken you can use "set format x" to set the x-axis. For
example:

set xdata time
set format x "%H"
set timefmt "%H:%M:%S"

Sets x data as time and will display each hour on x-axis from the time
format H:M:S

HTH,

Eric.

-----Original Message-----
From: gnu...@li...
[mailto:gnu...@li...] On Behalf Of Matt Kopeck
Sent: Thursday, July 07, 2005 10:26 AM
To: gnu...@li...
Subject: [Gnuplot-info] x-axis settings

Hi,

When I use:

gnuplot> set xdata time
gnuplot> set timefmt "%H:%M"

I get the time plotted along the x-axis but I also the date.  Is it
possible to get the time plotted without the date?

Thanks,
Matt
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[Gnuplot-info] x-axis settings

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

Hi,

When I use:

gnuplot> set xdata time
gnuplot> set timefmt "%H:%M"

I get the time plotted along the x-axis but I also the date.  Is it
possible to get the time plotted without the date?

Thanks,
Matt
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Re: [Gnuplot-info] saving images in gnuplot

[Hans-Bernhard B. <br...@ph...>]

Paul Matthews wrote:

> especially the 'set pm3d map' plots. 
[...]
> eps is OK but not very efficient though I suppose I could gzip them.

That's why there's a special touch-up script for pm3d postscript output
distributed in the source tarball.  See gnuplot/pm3d/contrib.

> gnuplot's terminal options dont seem to include gif or jpeg any more 
> ("unknown or ambiguous terminal type").

Incorrect conclusion.  That's not gnuplot's doing, but a consequence of 
what libraries you (or whoever did that) made available at the time of 
building it.

[Gnuplot-info] saving images in gnuplot

[Paul M. <Pau...@ma...>]

Dear Gnuplot people

I like the new (version 4.0 patchlevel 0) version of gnuplot,
especially the 'set pm3d map' plots. 
It is running on a Sun V20z dual opteron with suze linux 9.0. 


But I am having difficulty saving images
in a sensible format. 

eps is OK but not very efficient though I suppose I could gzip them.

gnuplot's terminal options dont seem to include gif or jpeg any more 
("unknown or ambiguous terminal type").

There is  png but that gives an error when I do the pm3d plot:

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

So - what image format should I be using these days
for efficient storage of gnuplot images?
 (and ultimately for making movies)


Paul Matthews





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Re: [Gnuplot-info] Graphing Incorrectly

[Hans-Bernhard B. <br...@ph...>]

Matt Kopeck wrote:

> I am trying to graph this using boxes but the graph isn't doing what I
> want...

Odds are this is because you didn't read "help boxes", the first 
paragraph in particular.  Because you this, script fails to tell gnuplot 
what it might be that you want. (BTW: you forgot to tell us, too)

[Gnuplot-info] Graphing Incorrectly

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

Hi,

I have the following input file:

104     09:14
104     09:15
107     09:16
105     09:18
85      14:56
92      08:17

I am trying to graph this using boxes but the graph isn't doing what I
want...Here are the commands I am giving gnuplot:

gnuplot> set xdata time
gnuplot> set timefmt "%H:%M"
gnuplot> plot ["0:00":"23:59"] "email_input.txt" using 2:1 w boxes

Can anyone help me to get this graphing correctly?

Thanks,
Matt
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Re: [Gnuplot-info] GNUPlot version 4.0

[Hans-Bernhard B. <br...@ph...>]

Chennupati, Balakrishna (HP Labs India) wrote:
> The command "set terminal png transparent nocrop enhanced font arial 8
> size 1200,300" works in the windows version of GNUPlot 4.0. In the Linux
> version 4.0, 

You're problem is right here: you speak of "the" Linux version, but such 
a thing doesn't exist.  There exist versions of gnuplot compiled by 
various people, including Linux distributors.  Some of them made rather 
sub-optimal configuration choices for their builds.

> Why the difference? 

Because your Linux binary was built with the wrong PNG driver.  You'll 
see the difference if you "show version long" on both platforms and 
check the "Compile options" part.

> Please tell me if its possible to write code that's independent of 
> platform.

gnuplot tries to keep scripts as platform-independent as possible, but 
the availability of terminal drivers and the options they support is 
where this ceases to work.  "set terminal" commands essentially cannot 
be fully portable.

[Gnuplot-info] GNUPlot version 4.0

[Chennupati, B. (HP L. India) <bal...@hp...>]

Hello,

The command "set terminal png transparent nocrop enhanced font arial 8
size 1200,300" works in the windows version of GNUPlot 4.0. In the Linux
version 4.0, it says
"expecting: {small, medium, large},[no]transparent, or {monochrome,
gray, color, [xRRGGBB] }". Why the difference ? Please tell me if its
possible to write code that's independent of platform.

FYI The version in GNUPlot 4.0 Linux says :
G N U P L O T
Version 4.0 patchlevel 0
last modified Thu Apr 15 14:44:22 CEST 2004
System: Linux 2.6.9-1.667

Thanks.

Re: [Gnuplot-info] interfacing gnuplot

[Hans-Bernhard B. <br...@ph...>]

jue...@ce... wrote:
> I am trying to use gnuplot as a plotting facility for an application.
> To that end, I start 'gnuplot -' in the background and communicate
> with it via pipes. 

The "-" is a placebo in this case.  Just pipe directly into gnuplot --- 
it's smart enough to recognize a redirected stdin all by itself.

> Are there any plans to improve gnuplot with respect to interfacing
> with other applications, e.g., defining an API and offering a
> 'libgnuplot' build option?

Hopes and wishes, yes, but nothing as solid as "plans".

[Gnuplot-info] marvelous art-Chinese embroidery

[hangtang <tem...@du...>]

<html><title>marvelous art-Chinese embroidery</title>
<body>
<strong>marvelous art-Chinese embroidery</strong><br>
Embroidery, the ancient art has increased people¡¯s life interests and influenced human¡¯s sentiment for thousands of years. As one of the founders of this art, Chinese embroidery brought embroidery art to the new altitude at last century. People highly praised classic paint such as ¡°Mona Lisa¡± and ¡°Sunflower¡± that embroidered by artists. Furthermore, artists embroidered portraits of country leaders and give themselves as national gifts. These country leaders including George Bush, the President of USA; Jacques Chirac, the President of France; the royal family of Japan and Kofi A. Annan, the Former Secretary-General of the United Nations.
The website <a href="http://www.dufe-emba.com/works.htm">www.dufe-emba.com</a> has embroidery show, welcome to visit
<br>
<br>
Please do not write back to this eamil address becasue it is a temporary email address. If you are willing to cooperate with us, please visit our website and contact us. 

</body>
</html>

[Gnuplot-info] marvelous art-Chinese embroidery

[hangtang <tem...@du...>]

<html><title>marvelous art-Chinese embroidery</title>
<body>
<strong>marvelous art-Chinese embroidery</strong><br>
Embroidery, the ancient art has increased people¡¯s life interests and influenced human¡¯s sentiment for thousands of years. As one of the founders of this art, Chinese embroidery brought embroidery art to the new altitude at last century. People highly praised classic paint such as ¡°Mona Lisa¡± and ¡°Sunflower¡± that embroidered by artists. Furthermore, artists embroidered portraits of country leaders and give themselves as national gifts. These country leaders including George Bush, the President of USA; Jacques Chirac, the President of France; the royal family of Japan and Kofi A. Annan, the Former Secretary-General of the United Nations.
The website <a href="http://www.dufe-emba.com/works.htm">www.dufe-emba.com</a> has embroidery show, welcome to visit
<br>
<br>
Please do not write back to this eamil address becasue it is a temporary email address. If you are willing to cooperate with us, please visit our website and contact us. 

</body>
</html>

[Gnuplot-info] interfacing gnuplot

[<jue...@ce...>]

Hi,

I am trying to use gnuplot as a plotting facility for an application.
To that end, I start 'gnuplot -' in the background and communicate
with it via pipes. It works okay and could be a lot easier if
gnuplot were designed for this purpose. BTW, I am wondering if the
'-' command line switch has any effects other than telling gnuplot
to take its input from stdin (the only other effect I observed is
that it omits it's startup message).

Are there any plans to improve gnuplot with respect to interfacing
with other applications, e.g., defining an API and offering a
'libgnuplot' build option?

Thanks,
Ralf

[Gnuplot-info] You have successfully added a new email address

[eBay <acc...@eB...>]

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Re: [Gnuplot-info] gnuplot xtic question

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

I have gone through the code for axis.c in the gnuplot sources. Below=
 is
some pseudo code containing the pieces of code that I think are relev=
ant
to what I am trying to do and also my understanding of what they do.
Again I am using a C program to calculate the position of xtics. Then
when i generate a "set xtics" command that will contain all the tic
values I want along with labels ( which is going to be minutes:second=
s).
The maximum range of what I want to graph will be 1 hour, but
realistically it will be about 500 seconds.=20

I dont understand how the tic interval is calculated in the funtion=
=20
quantize_normal_tics. Could someone explain to me using pseduo code e=
tc
how it works ?

Also the function quantize_duodecimal_tics rounds the tic interval. I=
t
is called from the quantize_time_tics function when the format of the
axis is time. It seems to be similar to the quantize_normal_tics
function.


I would appreciate any responses
Jonathan

---------------------------------------------------------------------=
------

void setup_tics(axis, max)
{

=09//part that im interested in =09
=09//TIC_COMPUTED =3D default; gnuplot figures them
=09} else if (ticdef->type =3D=3D TIC_COMPUTED) {
       =09=09 ticstep[axis] =3D tic =3D make_tics(axis, max);
=09}
}

static double make_tics(axis, guide)
{
=09range =3D absolute(max - min)
=09
=09//i presume tic refers to the tic interval
=09//calculate the tic interval
=09tic =3D quantize_normal_tics(range, guide);

=09//I want to use time data
=09//this rounds the tic interval to a nice figure
=09quantize_time_tics(axis, tic, range, guide);


}

//calculate the tic interval - dont understand the logic behind this
double=09quantize_normal_tics(range, guide)
{
=09floor ( base 10 log of the range)

=09.
=09.
=09.
=09.
=09
=09//seems complicated


}


//round tic interval to a nice value
static double quantize_time_tics(axis, tic, xr, guide)
{
=09//i will be graphing data whose range will be 1 hour maximum
=09//realistically the range will be about 500 seconds
=09//60 * 60 =3D 3600 sec


=09    timelevel[axis] =3D TIMELEVEL_SECONDS;
=09    if (tic > 5) {
=09        /* turn tic into units of minutes */
=09        tic =3D quantize_duodecimal_tics(xr / 60.0, guide12) * 60;
=09        if (tic >=3D 60)
=09            timelevel[axis] =3D TIMELEVEL_MINUTES;
=09    }



}

//again dont understand the logic behind this - it seems to me that i=
t
uses some of the logic from the quantize_normal_tics function
static double=09quantize_duodecimal_tics(arg, guide)
{
=09//seems complicated

}


/* make smalltics for time-axis */
//i presume these are the minor tics.=20
//not exactly sure what order this function is called
static double make_auto_time_minitics(tlevel, incr)
{

=09//part that seems relevant to me

    case TIMELEVEL_SECONDS:
    case TIMELEVEL_MINUTES:
        if (incr >=3D 5)
            tinc =3D 1;
        if (incr >=3D 10)
            tinc =3D 5;
        if (incr >=3D 20)
            tinc =3D 10;
        if (incr >=3D 60)
            tinc =3D 20;
        if (incr >=3D 2 * 60)
            tinc =3D 60;
        if (incr >=3D 6 * 60)
            tinc =3D 2 * 60;
        if (incr >=3D 12 * 60)
            tinc =3D 3 * 60;
        if (incr >=3D 24 * 60)
            tinc =3D 6 * 60;
        break;


}



On Thu, 2005-06-30 at 21:35 +0200, Hans-Bernhard Br=C3=B6ker wrote:
> Jonathan Lynch wrote:
>=20
> > There are potentially ten data points in the space of a second. I=
f i
> > express time in the format 16:19:25.941980 the graph is inaccurat=
e
> > because gnuplot does not support fractions of a second due to usi=
ng the
> > tm structure.
>=20
> It'll only be inaccurate if a second is still wider than one pixel =
on=20
> the actual output format.  Whether that's the case depends on the o=
utput=20
> format, and the length of the interval you have measurements for.
>=20
> > So Im going to stick to plotting the floating point data. Gnuplot
> > generates tics on the x-axis and labels them. What is the algorit=
hm
> > where gnuplot calculates where the tics should be?
>=20
> 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"
>=20
> > I could write a C program to parse through the data file and gene=
rate 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.
>=20
> Why do you think you have to know the tick placement for that?  Thi=
s=20
> command will override the automatically placed tick positions, so i=
t=20
> doesn't matter where they would have gone.
>=20
>=20
>=20
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