gnuplot-info — For questions and discussion about gnuplot

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Re: [Gnuplot-info] about error bars when fitting data

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

Yong Zhang wrote:

> reasonable. The problem is, when looking at the plot, it is quite 
> obvious that the second set of data has higher fluctuation than the 
> first set, but the error bar provided by gnuplot was quite close for 
> both fitted T and b for the two set of data. Could you please provide 
> any explanation about this results? 

For somebody
The fit parameter errors are *not* the only thing you should be looking 
at to evaluate the quality of a fit.  You must check the residuals, too,
i.e. what gnuplot displays as "stdfit", i.e. the sqrt(chisquare/ndf). 
In the case at hand, the fit to f-1.dat has a much better stdfit figure 
of ~1.0, compared to the ~2.4 you get for f-2.dat.  In a different view
at the same result, 'fit' is telling you by these numbers what the 
variance of the data relative to the fitted function turned out to be, 
and in particular, that the second fit is indeed worse than the first.

gnuplot's "fit" command, unlike some other fitting programs, does not 
scale parameter errors with "stdfit".  You can see the difference if you 
actually supply data errors to the fit, by scaling them up and down and 
observing how various fitting programs change their reported results.

[Gnuplot-info] about error bars when fitting data

[Yong Z. <zh...@bu...>]

Hi,

I met a problem when fitting data.
I have two set of data, both of which are supposed to be a single 
exponential decay function. By setting f(x)=a*exp(-x/T)+b and fitting 
the data via a,T,b, I got some value for these parameters and it seems 
reasonable. The problem is, when looking at the plot, it is quite 
obvious that the second set of data has higher fluctuation than the 
first set, but the error bar provided by gnuplot was quite close for 
both fitted T and b for the two set of data. Could you please provide 
any explanation about this results? The data and fitting results are 
attached.
Thank you.

Best wishes,

-- 
------------------------
Yong Zhang
Chemistry Department
Boston University
590 Commonwealth Avenue
Boston,MA,02215
------------------------ 

[Gnuplot-info] Gnuplot 4.1

[<ra...@bl...>]

Hi

I have downloaded and installed the windows version of gnuplot. I am very
interested in using the histogram feature in 4.1. But as I am not a developer
is it possible to get some instructions on how to achieve this from my windows
4.0 version? Also do you know when this will be released for windows 4.1?
Anyway help will be appreciated. Thanks Ray

Re: [Gnuplot-info] gnuplot script encoding query

[Edward H. <ph...@le...>]

Hans-Bernhard Broeker wrote:

> In other words, it's apparently the file's name or location, not its 
> content, that causes the problem.  So: what is that name and location,
> actually?  On what platform?

I'm running Mandrake 10.1 with kernel 2.6.

I think I've found some idea of what the cause is.  If I open the script 
for editing and at the head of the file press backspace a couple of 
times the file works.  There is some kind of non printing invisible 
character at the head of the file.  Most odd. :-\

I think I can now work this out in my program, something wrong I'm doing 
there!

Thank you again.

Re: [Gnuplot-info] gnuplot script encoding query

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

Edward Holness wrote:

> * The file with it's automatically created contents gives an error.
> * Copying the script to another file means that it works.
> * Copying a perfectly working script to the file gives an error.

In other words, it's apparently the file's name or location, not its 
content, that causes the problem.  So: what is that name and location,
actually?  On what platform?

> It is as if there is something in the file but not the text itself that 
> causes the error.  The URL is perfectly OK as moving a working script to 
> the URL and running works fine.

URLs don't exist in gnuplot's view of the world.

Re: [Gnuplot-info] gnuplot script encoding query

[Edward H. <ph...@le...>]

Hans-Bernhard Broeker wrote:

> I somewhat doubt that encoding is the problem.  A problem involving the
> way you send the commands over to gnuplot is more likely. 
> Blocking/buffering errors in communication through pipes have been 
> known to cause this kind of problem.

In this case I am not piping.  I am writing the script to a flat text 
file.  I now don't think it's encoding either, but something strange 
with the file.  The following can happen:

* The file with it's automatically created contents gives an error.
* Copying the script to another file means that it works.
* Copying a perfectly working script to the file gives an error.

It is as if there is something in the file but not the text itself that 
causes the error.  The URL is perfectly OK as moving a working script to 
the URL and running works fine.

> How are you executing the scripts, once they're generated?

I'm running my scripts by the shell command: gnuplot [filename].  This 
works OK on a working script but on this automatically generated script 
file does not.

Thanks for any help

Re: [Gnuplot-info] gnuplot script encoding query

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

Edward Holness wrote:
> I am currently writing a piece of software that will write data from 
> another application and automatically generate a script for gnuplot.  I 
> have run into an obstacle concerning the encoding of file formats.

I somewhat doubt that encoding is the problem.  A problem involving the
way you send the commands over to gnuplot is more likely. 
Blocking/buffering errors in communication through pipes have been known 
to cause this kind of problem.

> Which looks nothing like the original script.  Copying the contents of a 
> working script that I have into the file also gives errors.  Because of 
> this I have concluded that my program is writing the script using the 
> wrong encoding which gnuplot can't read.

Then why would a known-correct script instead of the one written by the 
program also fail?

How are you executing the scripts, once they're generated?

[Gnuplot-info] gnuplot script encoding query

[Edward H. <ph...@le...>]

Hello,

I am currently writing a piece of software that will write data from 
another application and automatically generate a script for gnuplot.  I 
have run into an obstacle concerning the encoding of file formats.

The errors I get are rather confusing as it appears that gnuplot is 
unable to tell line from line.  For instance :

    set terminal png font '/mnt/win_c/WINNT/Fonts/verdana.ttf' 11 
xffffff xclear; reset00 x000000 x000000
                                                                                                               
^
         "work.plot", line 1: invalid color spec, must be xRRGGBB

Which looks nothing like the original script.  Copying the contents of a 
working script that I have into the file also gives errors.  Because of 
this I have concluded that my program is writing the script using the 
wrong encoding which gnuplot can't read.

Is this consistent with the errors that I'm getting?  What form of 
encoding should I be using?  I'm not entirely sure what I'm using at the 
moment, just whatever OpenOffice Basic uses by default.

Does anyone else have experience with such issues when automating 
creation of scripts?

Best wishes

Ed

Re: [Gnuplot-info] Multiple individual dotted lines

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

Hamish Allan wrote:

> Using PCA I can determine the vectors of the principle components. Then 
> I want to plot lines for those vectors, which should bisect one another 
> on the diagram. First question: I'd like those lines to have arrowheads 
> on each end (so that they look like axes). How can I achieve this?

"help arrow"

> Second question: I can create a second 2D dataset which is the 
> projection of the original datapoints onto the principle component, so 
> that they all lie on the line of the principle component. I would like 
> to draw dotted or dashed lines between each original datapoint and its 
> new position. It's not clear to me how I would best achieve this. Can 
> anyone give me any advice?

Doing it with a second dataset would not be a good idea --- you need all 
the data in *one* dataset, to make this plot.  See "help vectors"
and the documentation about extended "using" specifications.

[Gnuplot-info] Multiple individual dotted lines

[Hamish A. <ham...@go...>]

Hi,

I'm trying to create a visual demonstration of how Principle Components 
Analysis works in projecting two-dimensional data into one dimension. 
So I have created some 2D datapoints which lie along a diagonal line, 
with some Gaussian noise thrown in.

Using PCA I can determine the vectors of the principle components. Then 
I want to plot lines for those vectors, which should bisect one another 
on the diagram. First question: I'd like those lines to have arrowheads 
on each end (so that they look like axes). How can I achieve this?

Second question: I can create a second 2D dataset which is the 
projection of the original datapoints onto the principle component, so 
that they all lie on the line of the principle component. I would like 
to draw dotted or dashed lines between each original datapoint and its 
new position. It's not clear to me how I would best achieve this. Can 
anyone give me any advice?

Many thanks,
Hamish

Re: [Gnuplot-info] line colors and terminal postscript / png

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

Alexander Klink wrote:

> Now I found out that I can change the line colors with
> X resources, 

I wonder how it happened that you found this, but didn't notice that 
it's clearly the *X11* terminal's colours only that get influenced by 
this.

> This works fine using the x11 terminal, but once I change
> to the postscript terminal, this seems to be lost.

Of course.

> Is there a way to change the line colors for the postscript
> and png terminals as well?

For PNG, see it's terminal help.  For postscript, you need to
edit the generated postscript (or the driver source), or switch
to the development version, which has rather more general 
colour-switching than gnuplot generally has.

[Gnuplot-info] line colors and terminal postscript / png

[Alexander K. <ak...@ig...>]

Hi all,

I am trying to plot some graphs using octave and gnuplot.
Now I found out that I can change the line colors with
X resources, so I've set
gnuplot*line1Color: #b30000
gnuplot*line2Color: #00b300
gnuplot*line3Color: #0000ff
gnuplot*line4Color: #000000

This works fine using the x11 terminal, but once I change
to the postscript terminal, this seems to be lost.
Is there a way to change the line colors for the postscript
and png terminals as well?

Greetings,
             Alex

[Gnuplot-info] Virus Warning

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Re: [Gnuplot-info] Cropping arrows

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

Konstantinos Kleisouris wrote:
>    I have a gnuplot graph that has arrows that go
> outside the xaxis range and I would like to make sure
> that the arrow outside the xrange does not appear. I
> want basically sth similar to "set clip two", but for
> arrows. Does anyone have any idea?

None other than the classical "don't do that, then!"

If you want arrows to end at the x axis range endpoints, define the 
accordingly in "graph" coordinates.  That's what you have those for.

[Gnuplot-info] Cropping arrows

[Konstantinos K. <kk...@ya...>]

Hi,

   I have a gnuplot graph that has arrows that go
outside the xaxis range and I would like to make sure
that the arrow outside the xrange does not appear. I
want basically sth similar to "set clip two", but for
arrows. Does anyone have any idea?

Thank you,
Kosta




		
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RE: [Gnuplot-info] Help on libpng12.sl.0

[Giroux, E. <Eri...@nr...>]

Hi Cheo,

It's at http://www.libpng.org/pub/png/libpng.html

=C9ric



-----Original Message-----
From: gnu...@li... =
[mailto:gnu...@li...] On Behalf Of Teng, =
Cheo S
Sent: April 14, 2005 11:57 AM
To: gnu...@li...
Subject: [Gnuplot-info] Help on libpng12.sl.0


Hi,

Thanks in advance for this help.

Yesterday, I downloaded gnuplot depot for HPUX 11.0 and installed it =
successfully. However, the following error is produced when gunplot is =
invoked.

lsc30008 57: ./gnuplot &
[1] 14840
lsc30008 58: /usr/lib/dld.sl: Can't open shared library: =
/usr/local/lib/libpng12.sl.0
/usr/lib/dld.sl: No such file or directory

[1]   IOT trap             ./gnuplot (core dumped)

Where can I find this shared library or how do I solve it? Thanks =
again.

Cheo Teng

National Synchrotron Light Source
Brookhaven National Laboratory
Upton, NY 11973

Tel: 631-344-5028	Email: te...@bn...


-------------------------------------------------------
SF email is sponsored by - The IT Product Guide
Read honest & candid reviews on hundreds of IT Products from real =
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[Gnuplot-info] How change automatically xrange?

[toni <to...@ce...>]

Hi everybody:
In my first step in this forum, I wish to know, how I change automatically the 
xrange on script. I want that when I start the script that graph my files, 
automatically put the current date and before five days. 
Thanks in advence. 
Toni

[Gnuplot-info] Help on libpng12.sl.0

[Teng, C. S <te...@bn...>]

Hi,

Thanks in advance for this help.

Yesterday, I downloaded gnuplot depot for HPUX 11.0 and installed it
successfully.
However, the following error is produced when gunplot is invoked.

lsc30008 57: ./gnuplot &
[1] 14840
lsc30008 58: /usr/lib/dld.sl: Can't open shared library:
/usr/local/lib/libpng12.sl.0
/usr/lib/dld.sl: No such file or directory

[1]   IOT trap             ./gnuplot (core dumped)

Where can I find this shared library or how do I solve it?
Thanks again.

Cheo Teng

National Synchrotron Light Source
Brookhaven National Laboratory
Upton, NY 11973

Tel: 631-344-5028	Email: te...@bn...

[Gnuplot-info] Version 4 problem

[Mike J D. <mj...@hp...>]

Hello,

The following works in version 3 but not in version 4.

I get this error.

gnuplot> splot 'iozone_gen_out.gnuplot' title "Write performance"
                                                                 ^
         "gnu3d.dem", line 25: All points y value undefined


See attached.

Anyone know whats wrong ?

Cheers
-mjd

Re: [Gnuplot-info] Problem with fitting

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

swlab wrote:
> On Tuesday 12 April 2005 13:11, Edward Holness wrote:

> I'm afraid your values are way too low to have any real significance 
> (computer-wise). 

You're wrong.  Absolute scales of values don't cause any problems like
that.  There is an unfortunate scale dependence on the *parameters* you 
fit, but neither the scale of x, nor that of y, has much influence on that.

Re: [Gnuplot-info] Problem with fitting

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

Edward Holness wrote:
> This works perfectly, what doesn't work is trying to fit a straight line 
> too it for which I am trying:
> f(x) = a*x + b
> a = 1e-23
> b = 0
> fit f(x) 'data.txt' using 1:2:3:4 via a, b

This has two errors. First, "using 1:2:3:4" in "fit" means you're doing
a 3D fit (f(x,y) fitted to [x,y,z]). Fit, by design, can't have x error
bars.  Make that "using 1:2:4".

Second, start-up values for parameters can't be zero.  It even says so 
somewhere below "help fit", IIRC.

Re: [Gnuplot-info] Problem with fitting

[swlab <sw...@co...>]

On Tuesday 12 April 2005 13:11, Edward Holness wrote:
> Hi,
>
> I have a problem with fitting data to a dataset with uncertainties in
> gnuplot 4.0 under Linux.

> a = 1e-23
> b = 0

1e-23 ? Is it a typo ?

> dealing with (xrange [0:0.5], yrange [0:4e-24]).

oops, it's not.
I'm afraid your values are way too low to have any real significance 
(computer-wise). AT this level, you're competing with the computer 
uncertainties. You should multiply your data by a large factor, say, 1e23, 
and try again.



-- 
Soil & Water Laboratory
Dept. of Biological & Environmental Engineering
Cornell University
Riley-Robb Hall
ITHACA, NY 14853

[Gnuplot-info] Problem with fitting

[Edward H. <ph...@le...>]

Hi,

I have a problem with fitting data to a dataset with uncertainties in 
gnuplot 4.0 under Linux.

The data file I am using is of the form:
x   y   xerror   yerror

I can plot this data complete with error bars with the line:
plot "data.txt" using 1:2:3:4 with xyerrorbars

This works perfectly, what doesn't work is trying to fit a straight line 
too it for which I am trying:
f(x) = a*x + b
a = 1e-23
b = 0
fit f(x) 'data.txt' using 1:2:3:4 via a, b

For some reason the line I get (which is meant to be calculated from 
uncertainties) is far from where it should be.  It runs at y = 
0.00635613x + 0.0041886, which is off the scale of the points that I'm 
dealing with (xrange [0:0.5], yrange [0:4e-24]).

Any ideas what is going wrong?  I've tried numerous 'using' arguments to 
no avail.

Here is my entire script:
clear; reset
f(x) = a*x + b
a = 1e-23
b = 0
fit f(x) 'data.txt' using 1:2:3:4 via a, b
set terminal png font "/mnt/win_c/WINNT/Fonts/verdana.ttf" 11 xffffff 
x000000 x000000 x000000 x000000
set output "mb.png"
set title "Magnetic field strength vs dE"
set xlabel "B (T)"
set ylabel "dE (J)"
set key off
plot "data.txt" using 1:2:3:4 with xyerrorbars
set xrange [0:0.5]; replot
set yrange [0:4e-24]; replot
replot f(x)