gnuplot-info — For questions and discussion about gnuplot

[Gnuplot-info] Label value from file and caption under the graph

[fusselpelusa <jun...@gm...>]

Hi,
I have a problem with labelling my plots at an arbitrary position (set label
"... %f" '???filename and column/line???' at ....) using values from a file.
Searching in the gnuplot manual did not help unfortunately. A google-search
did not do the job either. Perhaps I have to use the awk(?) or sed (?)
command? Anyway, as the value I would like to be as label is not the only
one in the line of my data file, perhaps awk will not work? 
Right now, my data file consists of two columns, from where I am plotting
all except the last line (with the every command). The interesting number in
the last line is the one in the second column which should be the label of
the graph. 
I am pretty new to the unix/gnuplot area. 
That's why the online helping tools/manuals for awk/sed ... are a bit too
short for me to understand without lots of examples.  

Additionally I would like to implement underneith the plot a few lines of
text from another textfile like a caption, is this possible with gnuplot? 
Thanks a lot for your help and sorry if I am posting an already answered
question, I could not find any related answer while searching in the forums
archive.
Cheers
Fusselpelusa
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Re: [Gnuplot-info] plot data

[horatiu <cl...@ya...>]

I  succeeded my firs =E2=80=9Cserious=E2=80=9D graph with gnuplot, but I'm =
far from what I
really want. I still don't understand how to use =E2=80=9Cset data separato=
r=E2=80=9D
command. Like I said my data comes like this:

, 191,-.92, .133333333333333,-6900
, 191.5,-.919066666666667, .133333333333333,-6893
, 192,-.918, .133333333333333,-6885
, 192.5,-.917066666666667, .133333333333333,-6878
, 193,-.916133333333333, 6.66666666666667E-02,-13742
, 193.5,-.915066666666667, .133333333333333,-6863
, 194,-.914066666666667, .2,-4570.33333333333

I tried:

set datafile separator ","
plot "CV2.dat" using 2:3

the graph isn't good =E2=80=93 the shape is far from reality

I succeeded by replacing =E2=80=9C,=E2=80=9D with 2 blanks, but I prefer to=
 don't modify the
datafile.
Thanks
--=20
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Re: [Gnuplot-info] Gnuplot "fit" command

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

ra...@be... wrote:
> Perhaps the mailing list does not allow attachements. 

I usually does... last I checked, there was only a size restriction, but 
no general refusal of attachments.

> 1,0.4

That's your problem right there.  Comma-separated isn't gnuplot's native 
input format.  You have to change the format, or tell gnuplot about it.

> It seems unlikely that playing with scaling factors should be necessary as
> this is the simplest data set possible and both variables are in the same
> order of magnitude. 

The scale of x is completely irrelevant anyway --- that of y only 
matters if you failed to provide realistic y errors.

Difference of scales matters if you have more than one fitted parameter, 
and they're of vastly different magnitude.  Scaling of x and y only 
matters as far as it causes parameter scales to differ --- but that can 
always be fixed in the model.

Re: [Gnuplot-info] Gnuplot "fit" command

[<ra...@be...>]

That solved the problem -- thanks for the help.

Before trying to use fit, I plotted the comma-seperated file and saw that
it came out OK. I assumed that this meant that gnuplot would understand
the data in its CSV form. I guess I was wrong.


- Jonathan

> Sorry, I meant:
>
> fit [1:15] f(x) "test.dat" via a
>
> or just
>
> fit f(x) "test.dat" via a
>
> Read "help data"!
>
> regards,
> Bernd
>
> ra...@be... schrieb:
>> Perhaps the mailing list does not allow attachements. I'll paste the
>> data
>> here:
>>
>> 1,0.4
>> 2,0.8
>> 3,1.2
>> 4,1.6
>> 5,2
>> 6,2.4
>> 7,2.8
>> 8,3.2
>> 9,3.6
>> 10,4
>> 11,4.4
>> 12,4.8
>> 13,5.2
>> 14,5.6
>> 15,6
>>
>>
>> It seems unlikely that playing with scaling factors should be necessary
>> as
>> this is the simplest data set possible and both variables are in the
>> same
>> order of magnitude. Thanks for the advice, though.
>>
>> - Jonathan
>>
>>
>>
>>
>>
>>> The attachment didn't make it.
>>> What is the range for x?
>>> If all number differ to much gnuplot will not find a good fit.
>>> You might have to play with scaling factors.
>>>
>>> Tammo
>>>
>>>
>>>
>>> On 5 Aug 2006 at 10:34, ra...@be... wrote:
>>>
>>>
>>>> I was looking for a good, simple program that will let me fit some
>>>> data
>>>> to
>>>> theoretical models. I decided to have a look at gnuplot and test it by
>>>> seeing if it can perform a simple linear fit. With the file attached
>>>> (testfile.csv), which fits y=0.4*x, I executed
>>>>
>>>> gnuplot> f(x) = a*x
>>>> gnuplot> fit f(x) "testfile.csv" via a
>>>>
>>>> I got the result
>>>>
>>>> Iteration 3
>>>> WSSR        : 4.13793           delta(WSSR)/WSSR   : -4.55122e-09
>>>> delta(WSSR) : -1.88326e-08      limit for stopping : 1e-05
>>>> lambda    : 0.00822598
>>>>
>>>> resultant parameter values
>>>>
>>>> a               = 1.10345
>>>>
>>>> After 3 iterations the fit converged.
>>>> final sum of squares of residuals : 4.13793
>>>> rel. change during last iteration : -4.55122e-09
>>>>
>>>> degrees of freedom (ndf) : 14
>>>> rms of residuals      (stdfit) = sqrt(WSSR/ndf)      : 0.54366
>>>> variance of residuals (reduced chisquare) = WSSR/ndf : 0.295567
>>>>
>>>> Final set of parameters            Asymptotic Standard Error
>>>> =======================            ==========================
>>>>
>>>> a               = 1.10345          +/- 0.01706      (1.546%)
>>>>
>>>>
>>>> correlation matrix of the fit parameters:
>>>>
>>>>                a
>>>> a               1.000
>>>>
>>>>
>>>>
>>>> Either I am missing something, or there is something very wrong with
>>>> gnuplot's fit command. The data should fit y=0.4*x exactly. I've tried
>>>> setting a to 0.43 before running the fit command and gotten the same
>>>> result.
>>>>
>>>> Any help?
>>>>
>>>> - Jonathan
>>>>
>>>
>>>
>>> -------------------------------------------------------------------------
>>> Take Surveys. Earn Cash. Influence the Future of IT
>>> Join SourceForge.net's Techsay panel and you'll get the chance to share
>>> your
>>> opinions on IT & business topics through brief surveys -- and earn cash
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>>> _______________________________________________
>>> Gnuplot-info mailing list
>>> Gnu...@li...
>>> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
>>>
>>>
>>
>>
>>
>> -------------------------------------------------------------------------
>> Take Surveys. Earn Cash. Influence the Future of IT
>> Join SourceForge.net's Techsay panel and you'll get the chance to share
>> your
>> opinions on IT & business topics through brief surveys -- and earn cash
>> http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
>> _______________________________________________
>> Gnuplot-info mailing list
>> Gnu...@li...
>> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
>>
>
>

Re: [Gnuplot-info] Gnuplot "fit" command

[<ra...@be...>]

Perhaps the mailing list does not allow attachements. I'll paste the data
here:

1,0.4
2,0.8
3,1.2
4,1.6
5,2
6,2.4
7,2.8
8,3.2
9,3.6
10,4
11,4.4
12,4.8
13,5.2
14,5.6
15,6


It seems unlikely that playing with scaling factors should be necessary as
this is the simplest data set possible and both variables are in the same
order of magnitude. Thanks for the advice, though.

- Jonathan




> The attachment didn't make it.
> What is the range for x?
> If all number differ to much gnuplot will not find a good fit.
> You might have to play with scaling factors.
>
> Tammo
>
>
>
> On 5 Aug 2006 at 10:34, ra...@be... wrote:
>
>> I was looking for a good, simple program that will let me fit some data
>> to
>> theoretical models. I decided to have a look at gnuplot and test it by
>> seeing if it can perform a simple linear fit. With the file attached
>> (testfile.csv), which fits y=0.4*x, I executed
>>
>> gnuplot> f(x) = a*x
>> gnuplot> fit f(x) "testfile.csv" via a
>>
>> I got the result
>>
>> Iteration 3
>> WSSR        : 4.13793           delta(WSSR)/WSSR   : -4.55122e-09
>> delta(WSSR) : -1.88326e-08      limit for stopping : 1e-05
>> lambda    : 0.00822598
>>
>> resultant parameter values
>>
>> a               = 1.10345
>>
>> After 3 iterations the fit converged.
>> final sum of squares of residuals : 4.13793
>> rel. change during last iteration : -4.55122e-09
>>
>> degrees of freedom (ndf) : 14
>> rms of residuals      (stdfit) = sqrt(WSSR/ndf)      : 0.54366
>> variance of residuals (reduced chisquare) = WSSR/ndf : 0.295567
>>
>> Final set of parameters            Asymptotic Standard Error
>> =======================            ==========================
>>
>> a               = 1.10345          +/- 0.01706      (1.546%)
>>
>>
>> correlation matrix of the fit parameters:
>>
>>                a
>> a               1.000
>>
>>
>>
>> Either I am missing something, or there is something very wrong with
>> gnuplot's fit command. The data should fit y=0.4*x exactly. I've tried
>> setting a to 0.43 before running the fit command and gotten the same
>> result.
>>
>> Any help?
>>
>> - Jonathan
>
>
>
>
> -------------------------------------------------------------------------
> Take Surveys. Earn Cash. Influence the Future of IT
> Join SourceForge.net's Techsay panel and you'll get the chance to share
> your
> opinions on IT & business topics through brief surveys -- and earn cash
> http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
> _______________________________________________
> Gnuplot-info mailing list
> Gnu...@li...
> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
>

Re: [Gnuplot-info] Gnuplot "fit" command

[Tammo H. <Tam...@ie...>]

The attachment didn't make it.
What is the range for x?
If all number differ to much gnuplot will not find a good fit.
You might have to play with scaling factors.

Tammo



On 5 Aug 2006 at 10:34, ra...@be... wrote:

> I was looking for a good, simple program that will let me fit some data to
> theoretical models. I decided to have a look at gnuplot and test it by
> seeing if it can perform a simple linear fit. With the file attached
> (testfile.csv), which fits y=0.4*x, I executed
> 
> gnuplot> f(x) = a*x
> gnuplot> fit f(x) "testfile.csv" via a
> 
> I got the result
> 
> Iteration 3
> WSSR        : 4.13793           delta(WSSR)/WSSR   : -4.55122e-09
> delta(WSSR) : -1.88326e-08      limit for stopping : 1e-05
> lambda    : 0.00822598
> 
> resultant parameter values
> 
> a               = 1.10345
> 
> After 3 iterations the fit converged.
> final sum of squares of residuals : 4.13793
> rel. change during last iteration : -4.55122e-09
> 
> degrees of freedom (ndf) : 14
> rms of residuals      (stdfit) = sqrt(WSSR/ndf)      : 0.54366
> variance of residuals (reduced chisquare) = WSSR/ndf : 0.295567
> 
> Final set of parameters            Asymptotic Standard Error
> =======================            ==========================
> 
> a               = 1.10345          +/- 0.01706      (1.546%)
> 
> 
> correlation matrix of the fit parameters:
> 
>                a
> a               1.000
> 
> 
> 
> Either I am missing something, or there is something very wrong with
> gnuplot's fit command. The data should fit y=0.4*x exactly. I've tried
> setting a to 0.43 before running the fit command and gotten the same
> result.
> 
> Any help?
> 
> - Jonathan

[Gnuplot-info] Gnuplot "fit" command

[<ra...@be...>]

I was looking for a good, simple program that will let me fit some data to
theoretical models. I decided to have a look at gnuplot and test it by
seeing if it can perform a simple linear fit. With the file attached
(testfile.csv), which fits y=0.4*x, I executed

gnuplot> f(x) = a*x
gnuplot> fit f(x) "testfile.csv" via a

I got the result

Iteration 3
WSSR        : 4.13793           delta(WSSR)/WSSR   : -4.55122e-09
delta(WSSR) : -1.88326e-08      limit for stopping : 1e-05
lambda    : 0.00822598

resultant parameter values

a               = 1.10345

After 3 iterations the fit converged.
final sum of squares of residuals : 4.13793
rel. change during last iteration : -4.55122e-09

degrees of freedom (ndf) : 14
rms of residuals      (stdfit) = sqrt(WSSR/ndf)      : 0.54366
variance of residuals (reduced chisquare) = WSSR/ndf : 0.295567

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

a               = 1.10345          +/- 0.01706      (1.546%)


correlation matrix of the fit parameters:

               a
a               1.000



Either I am missing something, or there is something very wrong with
gnuplot's fit command. The data should fit y=0.4*x exactly. I've tried
setting a to 0.43 before running the fit command and gotten the same
result.

Any help?

- Jonathan

Re: [Gnuplot-info] plot data

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

horatiu wrote:
> set datafile separator ","
> plot "CV.dat" index 2:3

You almost certainly don't want to use the "index" option here.  Read 
the docs again, especially "help plot datafile" and "help using", which 
the former points to.

> but it gives me error

And what error might that be?

[Gnuplot-info] plot data

[horatiu <cl...@ya...>]

Hi there. I just started to use Gnuplot. I read some tutorials and I
understand a little how it works. But in real world it's more complicated. I
want to plot some data gives by a machine. The data that I have has a format
like this (5 columns separated by comma)

, .5,-1.3016, 0, 0
, 1,-1.3006, 0, 0
, 1.5,-1.2996, 0, 0
, 2,-1.2986, 0, 0
, 2.5,-1.2976, 0, 0
, 3,-1.2966, 0, 0
, 3.5,-1.2956, 0, 0
, 4,-1.2946, 0, 0
, 4.5,-1.2936, 0, 0

the first column is empty and the second contains data like .5 it means 0.5. 

set datafile separator ","
plot "CV.dat" index 2:3

but it gives me error

How can I plot 
X=column 3 vs Y=column 4 ?

Thanx a lot
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Re: [Gnuplot-info] Ytics question

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

Nguyen, Van H wrote:
> On my bar chart,minimum value for my y axis is 3. I would like to show
> yaxis start at 0. I know that yrang[ymin:ymax] can set it to start at 0,
> but in my case I don't know ymax. How do I go about to solve this
> problem?

By reading a little more of the docs.  "help yrange" points you to "help 
xrange", which will allow you to understand why 'set yrange [-3:*]' is 
your solution.

[Gnuplot-info] Ytics question

[Nguyen, V. H <Van...@bo...>]

Hi,

On my bar chart,minimum value for my y axis is 3. I would like to show
yaxis start at 0. I know that yrang[ymin:ymax] can set it to start at 0,
but in my case I don't know ymax. How do I go about to solve this
problem?
I used ' set ytics 0,1' but it didn't work. It still shows yaxis start
at 3.=20

Any help on this matter would be appreciated. Thanks.

Van.=20

Re: [Gnuplot-info] Gnuplot-info Digest, Vol 3, Issue 1

[Per P. <per...@ma...>]

On Aug 1, 2006, at 21:10, gnu...@li...  
wrote:

> Hi, I'm currently a mac user and I tried to install GnuPlot for Mac Os
> X (I have the latest version which is 10.4.7 Tiger) but I just can't
> figure out how to use it. Where am I supposed to write the commands
> for GnuPlot? In Terminal?

Yes.

> How do I open GnuPlot?

By typing gnuplot at the prompt in Terminal.app
If you get an error, try typing /usr/local/bin/gnuplot instead.
If that works, you need to add /usr/local/bin to your system's search  
path to be able to type just gnuplot at the prompt. To do that, edit  
(or create if necessary) a plain text file named .bash_profile in  
your home directory, adding the content:
PATH="/usr/local/bin:$PATH"

> Is it a common app.
> with a GUI?
>
> I have already installed Aquaterm and I'm having problems with X11
> installation (the installer prompts a message saying a newer version
> of X11 is currently working, I think it's the SDK X11 but I'm not
> quite sure) and when I installed GnuPlot i got a message: "Could not
> find specified message for index 17"

X11 SDK has nothing to do with this, you need the X11.app, check the  
Applications folder.

/Per

Re: [Gnuplot-info] Plotting Data from different columns

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

Forrest Carpenter wrote:
> I have a data file that has multiple columns of data, i.e. x   
> avg_value  max_value  min_value.  I want to plot just the max_value  
> versus x, instead of avg_value vs x which is what happens when the  
> plot <'file'> command is entered.  What command should I use to do this.

Most importantly, you should read the documentation.  "help plot" and 
its sub-nodes, in particular 'help plot datafile using'

Re: [Gnuplot-info] =?utf-8?q?Exporting_fit_parameters_to_text_with_er?= =?utf-8?q?ror=09values?=

[Chris <cpa...@la...>]

Hernán Gonzalo Asorey <asoreyh <at> ib.cnea.gov.ar> writes:

> 
> Hi Chris,
> 
> Everytime you do a fit, a copy of what you see in your terminal is
> saved into the file "fit.log". There, you could see all the
> information provided during the fit procedure, errors included.Try
> "help fit" for additional information.
> I hope this helps.
> 
> On 7/31/06, Chris <cpaulson <at> lanl.gov> wrote:
> > Hi,
> > I'm trying to save fit parameters to file. I've accomplished it so far using:
> > save functions 'var.dat'
> > However, this method doesn't save any error information. Is there any way to
> > save  those values?
> > Thanks,
> > Chris
> >
> >
> > -------------------------------------------------------------------------
> > Take Surveys. Earn Cash. Influence the Future of IT
> > Join SourceForge.net's Techsay panel and you'll get the chance to share your
> > opinions on IT & business topics through brief surveys -- and earn cash
> > http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
> > _______________________________________________
> > Gnuplot-info mailing list
> > Gnuplot-info <at> lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/gnuplot-info
> >
> 


Hello, 
Thanks for the help. This isn't really going to work for me. I'm doing a batch
process. I read the file back into my program a little later so using the fit
file makes life much more complicated. I posted the same question on Google
Groups
(http://groups.google.com/group/comp.graphics.apps.gnuplot/browse_thread/thread/72184d33cee34185/74dadb9c6ae490bb#74dadb9c6ae490bb)
and got another reply that was much more feasible. I've posted Theo  Hopman's
response below:

This method also shouldn't save any information about variables, since 
you're asking it to save functions. If you do 
set fit errorvariables 
fit ... 
save variables 'var.dat' 

you'll have (all) variables, including fit parameters and their 
estimated errors in the file 'var.dat'.

Thanks again Hernán!
Chris

[Gnuplot-info] Plotting Data from different columns

[Forrest C. <fo...@ta...>]

I have a data file that has multiple columns of data, i.e. x   
avg_value  max_value  min_value.  I want to plot just the max_value  
versus x, instead of avg_value vs x which is what happens when the  
plot <'file'> command is entered.  What command should I use to do this.

Thanks
Forrest

Re: [Gnuplot-info] Exporting fit parameters to text with error values

[<as...@ib...>]

Hi Chris,

Everytime you do a fit, a copy of what you see in your terminal is
saved into the file "fit.log". There, you could see all the
information provided during the fit procedure, errors included.Try
"help fit" for additional information.
I hope this helps.

On 7/31/06, Chris <cpa...@la...> wrote:
> Hi,
> I'm trying to save fit parameters to file. I've accomplished it so far us=
ing:
> save functions 'var.dat'
> However, this method doesn't save any error information. Is there any way=
 to
> save  those values?
> Thanks,
> Chris
>
>
> -------------------------------------------------------------------------
> Take Surveys. Earn Cash. Influence the Future of IT
> Join SourceForge.net's Techsay panel and you'll get the chance to share y=
our
> opinions on IT & business topics through brief surveys -- and earn cash
> http://www.techsay.com/default.php?page=3Djoin.php&p=3Dsourceforge&CID=3D=
DEVDEV
> _______________________________________________
> Gnuplot-info mailing list
> Gnu...@li...
> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
>



--=20
---------------------------------------------
Mgter.  Hern=E1n  Gonzalo  Asorey
Instituto Balseiro - CAB
(8400) San Carlos de Bariloche
R=EDo Negro  - Rep. Argentina
---------------------------------------------
as...@ca...

Re: [Gnuplot-info] setting line size

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

solled wrote:
> How do I change the thickness of lines in gnuPlot? 

Add option 'linewidth' to the end of the plot specification (see "help 
plot" and "help plot with").

 > When I import graphs into
> latex the lines are very skimpy and I can't differentiate them. 

That may be caused by using a bad choice of terminal driver.  What 
terminal driver did you use?

[Gnuplot-info] Having Problems with Mac Os X

[Wascar B. <was...@gm...>]

Hi, I'm currently a mac user and I tried to install GnuPlot for Mac Os
X (I have the latest version which is 10.4.7 Tiger) but I just can't
figure out how to use it. Where am I supposed to write the commands
for GnuPlot? In Terminal? How do I open GnuPlot? Is it a common app.
with a GUI?

I have already installed Aquaterm and I'm having problems with X11
installation (the installer prompts a message saying a newer version
of X11 is currently working, I think it's the SDK X11 but I'm not
quite sure) and when I installed GnuPlot i got a message: "Could not
find specified message for index 17"

Please help me,

-- 
Wascar Bocangel

[Gnuplot-info] setting line size

[solled <so...@ms...>]

How do I change the thickness of lines in gnuPlot? When I import graphs into
latex the lines are very skimpy and I can't differentiate them. 

THANKS
-- 
View this message in context: http://www.nabble.com/setting-line-size-tf2030843.html#a5586429
Sent from the Gnuplot - User forum at Nabble.com.

[Gnuplot-info] Exporting fit parameters to text with error values

[Chris <cpa...@la...>]

Hi, 
I'm trying to save fit parameters to file. I've accomplished it so far using:
save functions 'var.dat'
However, this method doesn't save any error information. Is there any way to
save  those values? 
Thanks, 
Chris 

Re: [Gnuplot-info] tic placement problem

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

Brian Curtis wrote:

> Please refer to the attached bug.zip and the readme inside.  

The attachment didn't make it --- but you already know that.

I suggest you go to the Bug Tracker at SourceForge and submit this
there. You should be able to attach your example there. In case of
doubt, try to reduce your problem to the absolute bare minimum and post
it as text.

[Gnuplot-info] tic placement problem

[Brian C. <bcu...@ya...>]

since it won't allow me to attach and send, how do i get the attachment to everyone?

~Brian C.

[Gnuplot-info] tic placement problem

[Brian C. <bcu...@ya...>]

Please refer to the attached bug.zip and the readme inside.  We notice that when plotting with the data starting at odd numbers (y.txt/y.dat) in a time series plot that the graph certainly isn't what we wanted.  The plot created with the data starting at even numbers (x.txt/x.dat) in a time series plot is what we wanted.  x.dat data starts at 0 while y.dat data starts at one and that is where we believe the problem might be, you should notice that the vertical lines in y.dat aren't at 3 and 4 like we programmed it to do.  Is there any way to fix this so that the graph puts the x2tics where they are supposed to be and possibly puts the starting point of the graph at 1 like we wanted?

~Brian C.

Re: [Gnuplot-info] Permanently Setting the Terminal

[Per P. <per...@ma...>]

Patrick,

You can use the environment variable GNUTERM to control which  
terminal is the default, or perhaps better place a file  
named .gnuplot in your home directory and stuff any commands  
(including set term aqua <options>) to be run when gnuplot starts.

See 'help .gnuplot' and 'help environment', and note that Mac OS X  
behaves as generic Unix machines in these cases.

/Per

Re: [Gnuplot-info] generating postscript files

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

Henry FISCHER wrote:
> set term postscript
> set output "plot.ps"
> replot

You should

	unset output

at this point.  That closes the output file --- and among other things, 
writes the 'showpage' you were missing.