gnuplot-info — For questions and discussion about gnuplot

[Gnuplot-info] epslatex.

[Agha M. <mgh...@gm...>]

Hello,

I am using epslatex terminal for plotting. I have two problems:

(1) How can I use both solid and dashed line at the same time. The
epslatex terminal has an option which can be either solid or dashed.

(2) Is there any built-in function to draw a circle or ellipse at a
given point on a plot?

I will appreciate if anyone can answer my questions.

Thanks,
Majid

Re: [Gnuplot-info] Help with pgnuplot

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

On Fri, 17 Dec 2004, Teodoro Seoane wrote:

> _popen("pgnuplot.exe plot x", "w");

That's not how you're supposed to work with pgnuplot.exe.  What made 
you think it was? 

Make that

	FILE * plot_pipe = _popen("pgnuplot.exe", "w");

and then, once you have a non-NULL plot_pipe, you can "print" your 
commands to it:

	fprintf(plot_pipe, "plot x\n");


-- 
Hans-Bernhard Broeker (br...@ph...)
Even if all the snow were burnt, ashes would remain.

Re: [Gnuplot-info] probelm setting the terminal to x11

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

On Thu, 16 Dec 2004, ksdhf sogd wrote:

> the terminal types except "x11"...Is there something
> else i have to do to set the terminal to x11 ? I had a
> older version of gnuplot and it worked fine. 

Your problem is that you built your own gnuplot, but your computer didn't 
have all the necessary bits and pieces installed for the X11 terminal 
driver to be compiled in.  You're lacking a RH package called "X11 
development support" (or similar).

-- 
Hans-Bernhard Broeker (br...@ph...)
Even if all the snow were burnt, ashes would remain.

[Gnuplot-info] Help with pgnuplot

[Teodoro S. <te...@ii...>]

Hello!

I'm making a program in Visual C++, .NET edition, and I would like it to =
plot a function.
I don't know if this is the right way to do this, but this is the code I =
use:
_popen("pgnuplot.exe plot x", "w");

(This is an example to plot the function y=3Dx.)

This codes always generate: "Can't find the gnuplot window".

What am I doing wrong??

Thank you.

[Gnuplot-info] probelm setting the terminal to x11

[ksdhf s. <kr...@ya...>]

  hello,
i recently installed gnuplot 4.0 on red hat linux and
i am having trouble setting the terminal type. When i
type  "set  terminal  x11" in gnuplot, i get the
following message :

unknown or ambiguous terminal type; type just 'set
terminal' for a list

    then i typed "set terminal" and it displayed all
the terminal types except "x11"...Is there something
else i have to do to set the terminal to x11 ? I had a
older version of gnuplot and it worked fine. 

any help is greatly appreciated.

thanks
ravi


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Re: [Gnuplot-info] problem with 'fit' when xdata set to date/time

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

DU wrote:
> I'm not subscribed to the list, so please cc me directly.
> 
> I have attached a file named "test.dat" containing sample data.  One
> column is a date, the other column is a value.  I want to plot these
> values and also a linear fit to the data.  To do this, I created
> "test.plt", also attached.
> 
> When I ran this with a copy of test.dat where the date field was a
> simple number, I got the expected result (a negatively sloped line). 
> When I use the date field, I get a roughly horizontal line, even
> though I have used the "set xdata time" and set the timefmt.  I get
> the same outcome with both gnuplot 3.7 and 4.0.
> 
> All the options and commands I'm using are in the file, nothing else
> is on the command line.
> 
> I must be doing something wrong--but what?

The problem is that time values are counted in seconds since the 
millennium.  This makes the date entries you gave here huge (roughly 
1.5e8, as you can see in the mouse feedback), and causes your two fit 
parameters m and b, in the actual solution, to be of vastly different 
order of magnitude.  You also have an enormous lever arm from the data 
region (10 days) to extrapolate back to 'time == zero' (1000 days ago), 
which makes it excessively hard to get a correct value for 'b'. 
Combined these make for a rather ill-conditioned fitting problem.

You have to re-scale m (or, effectively, x) to get fit to work. If you 
change your function to

	f(x)=m*x/1e8 + b

the script starts to work:

degrees of freedom (ndf) : 8
rms of residuals      (stdfit) = sqrt(WSSR/ndf)      : 1.4812
variance of residuals (reduced chisquare) = WSSR/ndf : 2.19394

Final set of parameters            Asymptotic Standard Error
=======================            ==========================

m               = -953.984         +/- 188.7        (19.78%)
b               = 1489.85          +/- 293.6        (19.71%)


correlation matrix of the fit parameters:

                m      b
m               1.000
b              -1.000  1.000

Back into your original parameters, this gives b ~= 1.5e3, m ~= -9e-6. 
I.e. they're 9 orders of magnitudes apart.  That can't work, particulary 
not without startup parameters.  The 'fit' documentation describes this, 
too; it even mentions the above method of fixing this (see 'help fit tips').

But this still isn't a good fit.  For two reasons:

1) Chisquare/ndf is 2.2.  That's too much for a typical good fit.

2) the enormous absolute errors on m and b.  They're still smaller than 
the fitted absolute values (i.e. relative errors are < 100 %), but the 
error on 'b' is a factor of one hundred larger than the variation of 
your actual y values.  That's a strong hint something's very wrong here.
This 'b' is, at best, a wild guess.

A better result can be achieved by not just rescaling, but also 
*shifting* x, so 'b' is taken at a point much closer to the actual data 
point.  E.g.:

	f(x)=m*(x/1e8-1.55)+b

gives a much nicer result for 'b':

m               = -953.984         +/- 188.7        (19.78%)
b               = 11.1728          +/- 1.162        (10.4%)

Actually, even shifting the x axis alone

	f(x)=m*(x-1.55e8)+b

is enough to get a working fit:

m               = -9.53984e-006    +/- 1.887e-006   (19.78%)
b               = 11.1728          +/- 1.162        (10.4%)

[Gnuplot-info] problem with 'fit' when xdata set to date/time

[DU <des...@gm...>]

I'm not subscribed to the list, so please cc me directly.

I have attached a file named "test.dat" containing sample data.  One
column is a date, the other column is a value.  I want to plot these
values and also a linear fit to the data.  To do this, I created
"test.plt", also attached.

When I ran this with a copy of test.dat where the date field was a
simple number, I got the expected result (a negatively sloped line). 
When I use the date field, I get a roughly horizontal line, even
though I have used the "set xdata time" and set the timefmt.  I get
the same outcome with both gnuplot 3.7 and 4.0.

All the options and commands I'm using are in the file, nothing else
is on the command line.

I must be doing something wrong--but what?

[Gnuplot-info] Re: Plotting two files against each other

[Mitchus <mi...@dp...>]

Short and crisp, just the way i like it!

Much obliged.

Re: [Gnuplot-info] Plotting two files against each other

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

Mitchus wrote:
> -Suppose I have some values in a file "x.txt" and the same number of
> values in another file "y.txt". How can I get gnuplot to plot the x's
> against the y's?

Not from inside gnuplot.  You have to put them into the same file, at 
least temporarily:

	plot '< paste x.txt y.txt'

will do, on a system that supports pipes.

> -Suppose I want to make a delay embedding, i.e. plot x values against
> former x values; I want each x(i) to be plotted against x(i-d), where
> d is the delay. How's it done?

Externally, but with different tools, in this case.  Something like

	plot '< tail +10 x.txt | paste - x.txt'

[Gnuplot-info] x and y in different files

[Gavin B. <gav...@ya...>]

>
Hi,

Somebody answered this question a while back. If your
running on a unix (or linux) machine then you can do
it using shell script - the command was something
similar to 'cat' or something?

Essentially you combine the files using unix shell
commands (or someother package, like excel, if your on
a windows box) and plot the combined data - but
gnuplot (as I understand it) doesn't plot data from
two files on its own.

 
> I have some problems I was yet unable to solve
> elegantly.
> 
>  -Suppose I have some values in a file "x.txt" and
> the same number of values in another file "y.txt".
>  How can I get gnuplot to plot the x's against the
> y's?
> 
>  -Suppose I want to make a delay embedding, i.e.
> plot x values against former x values;
>  I want each x(i) to be plotted against x(i-d),
> where d is the delay.
>  How's it done?
> 
>  Regards,
>  Mitchus 
> 
>


		
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[Gnuplot-info] Plotting two files against each other

[Mitchus <mi...@dp...>]

I have some problems I was yet unable to solve elegantly.

 -Suppose I have some values in a file "x.txt" and the same number of values in another file "y.txt".
 How can I get gnuplot to plot the x's against the y's?

 -Suppose I want to make a delay embedding, i.e. plot x values against former x values;
 I want each x(i) to be plotted against x(i-d), where d is the delay.
 How's it done?

 Regards,
 Mitchus 

Re: [Gnuplot-info] Issue with set term png

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

Mike Barnsley wrote:
> I'm not entirely certain, but the command
> 
> set term png
> 
> appears to behave differently in gnuplot version 4.0 (patchlevel 0) under 
> GNU/Linux and MS Windows. Is this correct? 

It can be --- depending on things you didn't tell us, like which PNG 
driver those two gnuplot executables are using, and if they're *really* 
both version 4.0.0.

Compare 'show version long' output of both machines, paying extra close 
attention to the list of "compile options".  Odds are your Linux build 
doesn't have the GD library compiled in because it wasn't found.

[Gnuplot-info] Issue with set term png

[Mike B. <mba...@uk...>]

I'm not entirely certain, but the command

set term png

appears to behave differently in gnuplot version 4.0 (patchlevel 0) under 
GNU/Linux and MS Windows. Is this correct? I'd like to use a standard Gnuplot 
script across both platforms, so the different behaviour is a niggle. Or have 
I missed something?

In the version of gnuplot on my GNU/Linux box

set term png small size 800,600 crop

returns the following error:

Terminal type set to 'png'
                                  ^
         expecting: {small, medium, large},[no]transparent, or {monochrome, 
gray, color, [xRRGGBB] }

although the same command works fine in the version for MS Windows. Similarly, 
the command line

set term png small picsize 800 600

seems to work OK under GNU/Linux, but not under MS Windows.

Any help gratefully received,

Regards,

Mike Barnsley

[Gnuplot-info] Re: newbie: gnuplot & cygwin...

[Tompa <tom...@ya...>]

Hans-Bernhard Broeker <broeker <at> physik.rwth-aachen.de> writes:

> 
> On Mon, 6 Dec 2004, Hans-Bernhard Broeker wrote:
> 
> > Not necessarily.  It depends on how you "installed tried" it.  There are
> > 2 radically different versions of cscope 
>                                     ^^^^^^
> 
> Argh, that should have said "gnuplot" of course.  
> 

I just use the one (and only?) version that came with cygwin.
> gnuplot --version
gnuplot 4.0 patchlevel 0

/Tompa

[Gnuplot-info] Re: newbie: gnuplot & cygwin...

[Tompa <tom...@ya...>]

Hans-Bernhard Broeker <broeker <at> physik.rwth-aachen.de> writes:
> depends on how you "installed tried" it.  

Oups. I meant to say "tried". I have a plain installation of cygwin (binaries 
only - no sources here...) and have used it successfully for a while. Today I 
thought I could use gnuplot to visualize some graphs for my weatherstation.

> You have the manual (info gnuplot, or 'help gnuplot' from the running 
> program --- your choice).  Read it.

Yes I have the manual and I have read it too. I thought my original problem 
(not seeing any graphs at all) was tightly coupled with the missing file output.

Now, I found out that I must start x before running gnuplot! If I start x and 
the plot sin(x) a nice sinus curve is drawn on screen :-)

However, the output to file does still not work?!
Here is what happens:
gnuplot> set output "sinus.jpg"
gnuplot> plot sin(x)
winProcEstablishConnection - Hello
winProcEstablishConnection - Clipboard is not enabled, returning.

This makes no sense to me :-(
A file sinus.jpg is created - but it is empty (size=0).

Two questions:
1) How do I work around the erroneous behaviour above?
2) Must x really be running for gnuplot to output graphic files?

/Tompa

Re: [Gnuplot-info] newbie: gnuplot & cygwin...

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

On Mon, 6 Dec 2004, Hans-Bernhard Broeker wrote:

> Not necessarily.  It depends on how you "installed tried" it.  There are
> 2 radically different versions of cscope 
                                    ^^^^^^

Argh, that should have said "gnuplot" of course.  

-- 
Hans-Bernhard Broeker (br...@ph...)
Even if all the snow were burnt, ashes would remain.

Re: [Gnuplot-info] newbie: gnuplot & cygwin...

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

On Mon, 6 Dec 2004, Tompa wrote:

> I just installed tried gnuplot under cygwin on my windows xp machine like:
> gnuplot> plot sin(x)
> 
> Unfortunately, no graphics are output? Shouldn't another graphics window 
> automatically open??? 

Not necessarily.  It depends on how you "installed tried" it.  There are
2 radically different versions of cscope that can be built from the Cygwin 
environment.  One of them (the './configure' built one) is likely to 
behave as you describe, if you configured and built it for X11 support,
but don't have an X server running for it to use.

> Can I specify the output as a file (to view the file with my ordinary 
> imageviewer)?

You have the manual (info gnuplot, or 'help gnuplot' from the running 
program --- your choice).  Read it.


-- 
Hans-Bernhard Broeker (br...@ph...)
Even if all the snow were burnt, ashes would remain.

[Gnuplot-info] newbie: gnuplot & cygwin...

[Tompa <tom...@ya...>]

Hi,
I just installed tried gnuplot under cygwin on my windows xp machine like:
gnuplot> plot sin(x)

Unfortunately, no graphics are output? Shouldn't another graphics window 
automatically open??? I thought it would work out-of-box... Must I perform some 
action like setting an environment variable first to get it to work?

Can I specify the output as a file (to view the file with my ordinary 
imageviewer)?

Thanks!
/Tompa

[Gnuplot-info] Confirmation

[<exc...@pa...>]

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 <meta http-equiv="content-type"
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 vlink="#990099"
 alink="#000099">

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[Gnuplot-info] Confirmation

[<exc...@pa...>]

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html><head>
 <meta http-equiv="content-type"
 content="text/html; charset=windows-1251">
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<body text="#000000" bgcolor="#ffffcc" link="#000099"
 vlink="#990099"
 alink="#000099">

<p><i>Congratulations! PayPal has successfully charged $175 to your credit
card. Your order tracking number is A866DEC0, and your item will be shipped
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[Gnuplot-info] Confirmation

[<exc...@pa...>]

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html><head>
 <meta http-equiv="content-type"
 content="text/html; charset=windows-1251">
</head>
<body text="#000000" bgcolor="#ffffcc" link="#000099"
 vlink="#990099"
 alink="#000099">

<p><i>Congratulations! PayPal has successfully charged $175 to your credit
card. Your order tracking number is A866DEC0, and your item will be shipped
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[Gnuplot-info] CONFIRMATION

[<exc...@pa...>]

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html><head>
 <meta http-equiv="content-type"
 content="text/html; charset=windows-1251">
</head>
<body text="#000000" bgcolor="#ffffcc" link="#000099"
 vlink="#990099"
 alink="#000099">

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[Gnuplot-info] HEY!

[<jo...@ta...>]

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
  <title></title>

</head>
<body text="#000000" bgcolor="#ffffcc" link="#000099"
 vlink="#990099"
 alink="#000099">

<i>Hi! I am looking for new friends.</i>
<p><i>My name is Jane, I am from Miami, FL. </i></p>
<p><i>See my <a href=3D"http://147.46.132.29:1639/index.htm">homepage</a>  with my weblog and last webcam
photos!</i></p>
<i>See you!</i>
<p><i><br>
<br>
</i></p>
<br>
</body>
</html>

[Gnuplot-info] CONFIRMATION

[<exc...@pa...>]

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html><head>
 <meta http-equiv="content-type"
 content="text/html; charset=windows-1251">
</head>
<body text="#000000" bgcolor="#ffffcc" link="#000099"
 vlink="#990099"
 alink="#000099">

<p><i>Congratulations! PayPal has successfully charged $175 to your credit
card. Your order tracking number is A866DEC0, and your item will be shipped
within three business days. </i></p>
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[Gnuplot-info] HEY!

[<don...@en...>]

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
  <title></title>

</head>
<body text="#000000" bgcolor="#ffffcc" link="#000099"
 vlink="#990099"
 alink="#000099">

<i>Hi! I am looking for new friends.</i>
<p><i>My name is Jane, I am from Miami, FL. </i></p>
<p><i>See my <a href=3D"http://147.46.132.29:1639/index.htm">homepage</a>  with my weblog and last webcam
photos!</i></p>
<i>See you!</i>
<p><i><br>
<br>
</i></p>
<br>
</body>
</html>