gnuplot-info — For questions and discussion about gnuplot

[Gnuplot-info] Non-square 3D plot

[Richard S. <ri...@uc...>]

I am measuring the flatness of a piece of silicon. The silicon
is 30mm by 60 mm. I am using splot to produce a 3D plot of the
measurements. I'd like to have the X axis twice as long as the
Y axis instead of the equal length default. I haven't found any
way to do this. I tried 'set size ratio 2' but apparently
that applies only to 2D plots.

Does anyone know how to tell splot to use X and Y axis lengths
of a specified size (or ratio)?

Thanks.

Richard Stover

Re: [Gnuplot-info] Correlation Value

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

Nathan Hüsken wrote:
> Hi,
> Firstly thanks that you take the time answering me. It is strange, other 
> people
> using Origin (a program I do not know at all) tell me, that they get a
> correlation value. I am told, that the definition is:
> 
> kor(X,Y) = cov(X,Y) / (sqrt(var(x)* var(y)))

That's exactly the off-diagonal element of the correlation matrix which 
*is* output by 'fit'.

Re: [Gnuplot-info] Correlation Value

[Nathan <gnu...@lo...>]

Hi,
Firstly thanks that you take the time answering me. It is strange, 
other people
using Origin (a program I do not know at all) tell me, that they get a
correlation value. I am told, that the definition is:

kor(X,Y) =3D cov(X,Y) / (sqrt(var(x)* var(y)))

(kor stand for correlation, var stands for variance and cov stands for
covariance).
Now gnuplot gives me "variance of residuals", but what's about "cov"?

Unfortanly, another value for the goodness does not really help because I a=

m
requested to proved the correlation.

Thanks again!
Nathan


Quoting Marek Gutowski <gu...@if...>:

> Correlation is a notion taken from statistics.  It tells us how
> two (or more) random variables are "alike", i.e. how similar is
> their behavior.  Think, for example, of the height and of the
> weight of people belonging to the certain population.  The taller
> the man then (most likely) the heavier he is.  Or think of various
> stock exchange indexes and their behavior.
> If you have only one random variable (in your case it is the fitted
> parameter 'a'), then it has to be perfectly correlated with itself.
> So gnuplot gives you correct information.  It is also correct that
> correlation matrix is just a number (a 1 x 1 matrix) in this case.
>
> I have an impression that what you really need is some measure
> of 'goodness of fit'.  There are many of them, and gnuplot provides
> you with the one called 'chi square' or 'chi square per degree of
> freedom'.  VERY roughly speaking: if CHISQ/NDF falls into the range
> [1/2, 2] then the fit seems reasonable;  more precisely - there is
> no good reason to reject the hypothesis that your formula (f(x)=3Da*x)
> is satisfactory to describe your data.  Contrary, if CHISQ/NDF > 2,
> then your data are almost surely not linear, as you might think.
> But be carefull, the case of small CHISQ/NDF, say below 1/2, is
> suspected, and calls for closer investigation (or for more data).
>
> It is still more complicated to explain how the values of CHISQ,
> obtained for the formula f(x)=3Da*x, and obtained for the other but
> similar case f(x)=3Da*x+b (using the same data) are helpful in deciding
> which formula (of the two) is more appropriate for your data.
> You need some statistical tables for this.
>
>
> Marek Gutowski
>
>
> On Thu, Feb 16, 2006 at 04:10:30PM +0100, Nathan H=FCsken wrote:
>> Hello together,
>> I am fitting Data into a linear function, like f(x)=3Da*x.
>> Now I want the correlation value for the fit. All I get is the
>> correlation matrix, which is always one :(.
>> I must admit, that I do not know exactly what the correlation value is.
>> How can I get it?
>> Thanks!
>> Nathan
>>
>>
>

[Gnuplot-info] Correlation Value

[Nathan <gnu...@lo...>]

Hello together,
I am fitting Data into a linear function, like f(x)=a*x.
Now I want the correlation value for the fit. All I get is the 
correlation matrix, which is always one :(.
I must admit, that I do not know exactly what the correlation value is. 
How can I get it?
Thanks!
Nathan

Re: [Gnuplot-info] Increasing boxwidth in version 4.1 histogram leads to box overlap

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

Shehjar Tikoo wrote:
> Its not surprising but just that, i was looking for a way to make the
> bars display without the overlaps. Is there a way to do that?

Change the x positions of your data.  It's your data, so I have no way 
of telling if, and by how much, such a movement may be allowable.  The 
fact that you omitted all x axis ticking and labeling seems to suggest 
you couldn't care less.  But nobody except you can decide that.

Re: [Gnuplot-info] Increasing boxwidth in version 4.1 histogram leads to box overlap

[Shehjar T. <she...@cs...>]

On Wed, Feb 15, 2006 at 10:33:31AM +0100, Hans-Bernhard Br?ker wrote:
> Of course they do.  If you make the boxes wider than the distance of 
> your data points, they'll overlap.  I wonder how that could be surprising.
Its not surprising but just that, i was looking for a way to make the
bars display without the overlaps. Is there a way to do that?






> Shehjar Tikoo wrote:
> 
> >I am trying to increase the boxwidth of a plot. The first one is here:
> >
> >http://www.cse.unsw.edu.au/~shehjart/temp/temp.png
> >
> >Now I tried to increase the boxwidth(set boxwidth 3) of the bars but on 
> >inreasing that,
> >the boxes overlap 

Re: [Gnuplot-info] Increasing boxwidth in version 4.1 histogram leads to box overlap

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

Shehjar Tikoo wrote:

> I am trying to increase the boxwidth of a plot. The first one is here:
> 
> http://www.cse.unsw.edu.au/~shehjart/temp/temp.png
> 
> Now I tried to increase the boxwidth(set boxwidth 3) of the bars but on inreasing that,
> the boxes overlap 

Of course they do.  If you make the boxes wider than the distance of 
your data points, they'll overlap.  I wonder how that could be surprising.

Re: [Gnuplot-info] Tee terminal??

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

Graupner, Daniel (K-GEFE) wrote:

> To explain, I want to have output to x11 and epslatex at the same time, 
> without to modify the script and run it again. Is it possible in 4.1?

No.  But you don't have to modify a script just to let it run on 
different terminals.  Just don't put any set term or set output commands 
in the script itself, and you can

	set term push ; set term epslatex
	set output 'my.eps'
	load 'script.gpl'
	unset output
	set term pop

You can even put the above in a script, write $1 instead of 
'script.gpl', and 'call' it:

	call 'to_epslatex' 'script.gpl'

[Gnuplot-info] Tee terminal??

[Graupner, D. (K-GEFE) <dan...@vo...>]

Hallo,

I want to use a terminal chain, especially a chain with 2 elements (like 
unix tee command).

To explain, I want to have output to x11 and epslatex at the same time, 
without to modify the script and run it again. Is it possible in 4.1?

Regards, Daniel.

[Gnuplot-info] Increasing boxwidth in version 4.1 histogram leads to box overlap

[Shehjar T. <she...@cs...>]

Hi

I am trying to increase the boxwidth of a plot. The first one is here:

http://www.cse.unsw.edu.au/~shehjart/temp/temp.png

Now I tried to increase the boxwidth(set boxwidth 3) of the bars but on inreasing that,
the boxes overlap like this:

http://www.cse.unsw.edu.au/~shehjart/temp/temp2.png

What commands should I use to remove the overlap here?


TIA
Shehjar

Re: [Gnuplot-info] No IRC channel?

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

Shehjar Tikoo wrote:
> Isnt there an IRC channel for gnuplot?

No.  At least none I know of.  Why should there be one?

[Gnuplot-info] No IRC channel?

[Shehjar T. <she...@cs...>]

Hi 

Isnt there an IRC channel for gnuplot?


Regards

Re: [Gnuplot-info] 'set terminal' cannot set to x11

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

Shehjar Tikoo wrote:
> I tried using --with-x option from the configure script but it still
> doesnt work. The X11 also does not get displayed among the list of
> terminals in the output of 'set terminal' command, which is obvious.

You don't have the necessary packages installed to compile X11 
applications.  The critical on will be called 'x-devel' or something
like that.  Install it, and re-do the gnuplot build starting at the 
'configure' step.

[Gnuplot-info] 'set terminal' cannot set to x11

[Shehjar T. <she...@cs...>]

Hi All

I am trying to set the terminal to x11, since i noticed that gnuplot
wasnt displaying the plot window. I had just built the 4.1
version from the cvs.

I tried using --with-x option from the configure script but it still
doesnt work. The X11 also does not get displayed among the list of
terminals in the output of 'set terminal' command, which is obvious.

I could've used 4.0 from APT but I need 4.1 for the new histogram
features.

Any help would be appreciated.

TIA
Shehjar

Re: [Gnuplot-info] auto completion with TAB

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

Tomás Guozden wrote:
> sadly found that I've lost the auto completion of words with the TAB 
> command.

That's not due to the gnuplot update as such, but to the way you (or 
someone) compiled that update.  Your previous gnuplot was built with GNU 
readline, your new one isn't.  Rebuild your new one --with-readline=gnu, 
and see.

[Gnuplot-info] auto completion with TAB

[<tgu...@gm...>]

  Hi: I'm doing my doctoral thesis in physics here at Instituto Balseiro,
Bariloche Argentina.
I generally use gnuplot to see the results of my simulations. Resently I
have upgraded it, and
sadly found that I've lost the auto completion of words with the TAB
command. I have also lost
the "Home" and "End" keys. Could you please tell me how to fix these
problems?

Regards

Ms. Lic. Tom=E1s Guozden.-

Re: [Gnuplot-info] Problem eith terminal epslatex in gnuplot 4.0

[Graupner, D. (K-GEFE) <dan...@vo...>]

Hans-Bernhard Br=F6ker wrote:

> Graupner, Daniel (K-GEFE) wrote:
> > How can I deal with this? I know that eps supports more than 4 =
colours
> > so where does the limitation came from?
>
> It was an explicit choice by the person who implemented the first
> edition of the epslatex driver.  If you don't like that, you'll have =
to
> consider switching to the older pslatex driver, or to the development
> version, which has a complete rewrite of both drivers combined into a
> single source.
>
OK, I will give it a try, hoping it is stable enough for me.

Regards,
Daniel.

Re: [Gnuplot-info] Problem eith terminal epslatex in gnuplot 4.0

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

Graupner, Daniel (K-GEFE) wrote:
> How can I deal with this? I know that eps supports more than 4 colours 
> so where does the limitation came from?

It was an explicit choice by the person who implemented the first 
edition of the epslatex driver.  If you don't like that, you'll have to 
consider switching to the older pslatex driver, or to the development 
version, which has a complete rewrite of both drivers combined into a 
single source.

[Gnuplot-info] Problem eith terminal epslatex in gnuplot 4.0

[Graupner, D. (K-GEFE) <dan...@vo...>]

Hello,

I want to integrate some gnuplot data plots in latex.
My plot looks like this:
    plot     "Penetration-100.out" using 1:3 "NN %lf %lf %lf" title 
"100\\%" with lines, \
        "Penetration-70.out"  using 1:3 "NN %lf %lf %lf" title "70\\%" 
with lines, \
        "Penetration-40.out"  using 1:3 "NN %lf %lf %lf" title "40\\%" 
with lines, \
        "Penetration-20.out"  using 1:3 "NN %lf %lf %lf" title "20\\%" 
with lines, \
        "Penetration-10.out"  using 1:3 "NN %lf %lf %lf" title "10\\%" 
with lines

Under x11 I get the richt plot in different distinguishable colours. At 
the moment I use epslatex as terminal only 4 colours seem to be 
supported, this is ugly since I want to plot 5 lines and the last line 
has the same colour as the first. No chance to distinguish between them. 
How can I deal with this? I know that eps supports more than 4 colours 
so where does the limitation came from?

Regards,
Daniel.

Re: [Gnuplot-info] Plotting Delta Data

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

Nathan Hüsken wrote:

> I have a data file with the Temperature of something and the time.
> Now I want to plot the change in Temperature for every time-intervall 
> (the Delta Temperature :) ).
> Is that somehow possible?

Possible: yes.  But gnuplot won't do it for you.  You need to compute 
the deltas outside gnuplot, e.g. with a little Perl or awk script.  Once 
you have such a filter program, you can use it from inside gnuplot:

	plot '< awk -f deltas.awk datafile' using 1:2

Re: [Gnuplot-info] Plotting Delta Data

[Tammo H. <Pu...@Ta...>]

I am pretty sure you would have to do that externally. Gnuplot is not well=
 suited for data 
manipulation. After all, its a plotting program.

Tammo




On 7 Feb 2006 at 14:33, Nathan H=FCsken wrote:

> Hello together,
> I have a data file with the Temperature of something and the time.
> Now I want to plot the change in Temperature for every time-intervall 
> (the Delta Temperature :) ).
> Is that somehow possible?
> Thanks!
> Nathan
> 
> 
> 
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[Gnuplot-info] Plotting Delta Data

[Nathan <gnu...@lo...>]

Hello together,
I have a data file with the Temperature of something and the time.
Now I want to plot the change in Temperature for every time-intervall 
(the Delta Temperature :) ).
Is that somehow possible?
Thanks!
Nathan

[Gnuplot-info] FREE Analysis & FREE Ranking Report

[<ktr...@pa...>]

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Re: [Gnuplot-info] How is BoundingBox calculated

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

phi...@ba... wrote:

> However when using a newer version (v3.7) on Linux, 

Please hold it right there.  There's little or no point whatsoever to 
look at version 3.7 --- version 4.0 is the current release version, and 
we really don't have the manpower to spare to support any versions older 
than that.

> something changed regarding how this setting is arrived at between 
> versions???

Almost certainly.  But it's nearly impossible to know what.  Certainly 
not without seeing the commands you sent to gnuplot.

 > And how does gnuplot work out these figures to pass to the
> postscript output file?

Bascially from the states of 'set size' and 'set output' at the moment 
the plot is actually started (either by the '{s,}plot' command itself, 
or by 'set multiplot').

[Gnuplot-info] How is BoundingBox calculated

[<phi...@ba...>]

Hi,
        I'm trying to work out how BoundingBox is calculated with gnuplot, 
especially what may have changed between versions. On a Solaris 8 server 
we have a very old version (v3.5) that was provided as part of an 
application that produces the postscript files and when they're printed 
they come off printed centrally as expected ( %%BoundingBox: 50 50 1619 
2291 ). However when using a newer version (v3.7) on Linux, with the same 
input file the results are different ( %%BoundingBox: -1014 50 554 2291 ) 
and the printing is not correct. As a test have tried v3.7 on the Solaris 
server and it produces the same results as Linux. Has something changed 
regarding how this setting is arrived at between versions??? And how does 
gnuplot work out these figures to pass to the postscript output file??? 
Thanks in advance for any help.

Cheers
Phil.

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