gnuplot-info — For questions and discussion about gnuplot

Re: [Gnuplot-info] yerrorbars and linespoints

[Thomas S. <t.s...@fz...>]

you may
- plot 'with errorlines'
- plot 'with lines' & plot 'with errorbars'


tom fogal-3 wrote:
> 
> "Heeren,Tammo,IRVINE,R&D" <Tam...@Al...> writes:
>> Tom,
>>
>> Why don't you simply plot the data twice? Once with linespoints and
>> once with yerrorbars?
> 
>   > I tried giving my data file twice and notitle'ing the second time,
>   > but I can't seem to get the lines and error bars to be the same
>   > color.  This is despite using `set line style' to explicitly set
>   > line colors, which seem to get ignored/silently changed if they
>   > overlap with another color.
> 
> Actually, since posting I have partially got this to work in that
> manner.  The trick is using the same linetype for the two plots; trying
> to set the second plot's linecolor to the first's ends up changing the
> color to black.
> 
> The downside is I'm getting *both* points and error bars superimposed
> on top of each other.  This isn't quite as terrible, as the figures end
> up rather small in the final pdf, and it's hard to notice.  Ideas on
> that are welcome, though...
> 
> -tom
> 
>> > -----Original Message-----
>> > From: tom fogal [mailto:tf...@al...] 
>> > Sent: Wednesday, February 03, 2010 10:40 AM
>> > To: gnu...@li...
>> > Subject: [Gnuplot-info] yerrorbars and linespoints
>> > 
>> > I'm struggling to get a plot which includes both yerrorbars 
>> > and lines connecting the data points.
>> > 
>> > I want something like:
>> > 
>> >   plot "data" title "t" with linespoints yerrorbars lw 3 ps 2
>> > 
>> > for example, but I get a parse error after the "linespoints". 
>> >  I can plot with just yerrorbars, but then there's nothing 
>> > connecting my data.
>> > I can plot with just lines or linespoints, but then of course 
>> > I don't get my error bars.
>> > 
>> > I tried giving my data file twice and notitle'ing the second 
>> > time, but I can't seem to get the lines and error bars to be 
>> > the same color.
>> > This is despite using `set line style' to explicitly set line 
>> > colors, which seem to get ignored/silently changed if they 
>> > overlap with another color.
>> > 
>> > I'm using the postcript color enhanced terminal with gnuplot 
>> > 4.2 patchlevel 2.  Any ideas?
>> > 
>> > Thanks,
>> > 
>> > -tom
>> > 
>> > --------------------------------------------------------------
>> > ----------------
>> > The Planet: dedicated and managed hosting, cloud storage, 
>> > colocation Stay online with enterprise data centers and the 
>> > best network in the business Choose flexible plans and 
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>> > gnuplot-info mailing list
>> > gnu...@li...
>> > https://lists.sourceforge.net/lists/listinfo/gnuplot-info
>> > 
>> 
>> This e-mail (including any attachments) is confidential and may be
>> legally pr
>> ivileged. If you are not an intended recipient or an authorized
>> representativ
>> e of an intended recipient, you are prohibited from using, copying or
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>> uting the information in this e-mail or its attachments. If you have
>> received
>>  this e-mail in error, please notify the sender immediately by return
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>> Thank you.
> 
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Re: [Gnuplot-info] yerrorbars and linespoints

[Heeren,Tammo,IRVINE,R&D <Tam...@Al...>]

Tom,

Why don't you simply plot the data twice? Once with linespoints and once with yerrorbars?

Tammo 

> -----Original Message-----
> From: tom fogal [mailto:tf...@al...] 
> Sent: Wednesday, February 03, 2010 10:40 AM
> To: gnu...@li...
> Subject: [Gnuplot-info] yerrorbars and linespoints
> 
> I'm struggling to get a plot which includes both yerrorbars 
> and lines connecting the data points.
> 
> I want something like:
> 
>   plot "data" title "t" with linespoints yerrorbars lw 3 ps 2
> 
> for example, but I get a parse error after the "linespoints". 
>  I can plot with just yerrorbars, but then there's nothing 
> connecting my data.
> I can plot with just lines or linespoints, but then of course 
> I don't get my error bars.
> 
> I tried giving my data file twice and notitle'ing the second 
> time, but I can't seem to get the lines and error bars to be 
> the same color.
> This is despite using `set line style' to explicitly set line 
> colors, which seem to get ignored/silently changed if they 
> overlap with another color.
> 
> I'm using the postcript color enhanced terminal with gnuplot 
> 4.2 patchlevel 2.  Any ideas?
> 
> Thanks,
> 
> -tom
> 
> --------------------------------------------------------------
> ----------------
> The Planet: dedicated and managed hosting, cloud storage, 
> colocation Stay online with enterprise data centers and the 
> best network in the business Choose flexible plans and 
> management services without long-term contracts Personal 24x7 
> support from experience hosting pros just a phone call away.
> http://p.sf.net/sfu/theplanet-com
> _______________________________________________
> gnuplot-info mailing list
> gnu...@li...
> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
> 

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Thank you.

Re: [Gnuplot-info] yerrorbars and linespoints

[tom f. <tf...@al...>]

"Heeren,Tammo,IRVINE,R&D" <Tam...@Al...> writes:
> Tom,
>
> Why don't you simply plot the data twice? Once with linespoints and
> once with yerrorbars?

  > I tried giving my data file twice and notitle'ing the second time,
  > but I can't seem to get the lines and error bars to be the same
  > color.  This is despite using `set line style' to explicitly set
  > line colors, which seem to get ignored/silently changed if they
  > overlap with another color.

Actually, since posting I have partially got this to work in that
manner.  The trick is using the same linetype for the two plots; trying
to set the second plot's linecolor to the first's ends up changing the
color to black.

The downside is I'm getting *both* points and error bars superimposed
on top of each other.  This isn't quite as terrible, as the figures end
up rather small in the final pdf, and it's hard to notice.  Ideas on
that are welcome, though...

-tom

> > -----Original Message-----
> > From: tom fogal [mailto:tf...@al...] 
> > Sent: Wednesday, February 03, 2010 10:40 AM
> > To: gnu...@li...
> > Subject: [Gnuplot-info] yerrorbars and linespoints
> > 
> > I'm struggling to get a plot which includes both yerrorbars 
> > and lines connecting the data points.
> > 
> > I want something like:
> > 
> >   plot "data" title "t" with linespoints yerrorbars lw 3 ps 2
> > 
> > for example, but I get a parse error after the "linespoints". 
> >  I can plot with just yerrorbars, but then there's nothing 
> > connecting my data.
> > I can plot with just lines or linespoints, but then of course 
> > I don't get my error bars.
> > 
> > I tried giving my data file twice and notitle'ing the second 
> > time, but I can't seem to get the lines and error bars to be 
> > the same color.
> > This is despite using `set line style' to explicitly set line 
> > colors, which seem to get ignored/silently changed if they 
> > overlap with another color.
> > 
> > I'm using the postcript color enhanced terminal with gnuplot 
> > 4.2 patchlevel 2.  Any ideas?
> > 
> > Thanks,
> > 
> > -tom
> > 
> > --------------------------------------------------------------
> > ----------------
> > The Planet: dedicated and managed hosting, cloud storage, 
> > colocation Stay online with enterprise data centers and the 
> > best network in the business Choose flexible plans and 
> > management services without long-term contracts Personal 24x7 
> > support from experience hosting pros just a phone call away.
> > http://p.sf.net/sfu/theplanet-com
> > _______________________________________________
> > gnuplot-info mailing list
> > gnu...@li...
> > https://lists.sourceforge.net/lists/listinfo/gnuplot-info
> > 
> 
> This e-mail (including any attachments) is confidential and may be legally pr
> ivileged. If you are not an intended recipient or an authorized representativ
> e of an intended recipient, you are prohibited from using, copying or distrib
> uting the information in this e-mail or its attachments. If you have received
>  this e-mail in error, please notify the sender immediately by return e-mail 
> and delete all copies of this message and any attachments.
> Thank you.

[Gnuplot-info] yerrorbars and linespoints

[tom f. <tf...@al...>]

I'm struggling to get a plot which includes both yerrorbars and lines
connecting the data points.

I want something like:

  plot "data" title "t" with linespoints yerrorbars lw 3 ps 2

for example, but I get a parse error after the "linespoints".  I can
plot with just yerrorbars, but then there's nothing connecting my data.
I can plot with just lines or linespoints, but then of course I don't
get my error bars.

I tried giving my data file twice and notitle'ing the second time, but
I can't seem to get the lines and error bars to be the same color.
This is despite using `set line style' to explicitly set line colors,
which seem to get ignored/silently changed if they overlap with another
color.

I'm using the postcript color enhanced terminal with gnuplot 4.2
patchlevel 2.  Any ideas?

Thanks,

-tom

[Gnuplot-info] Plot with pm3d - hidden3d and line colours

[crashdum <fre...@cl...>]

Hello,

I'm quite new to gnuplot, and I have a question regarding a feature of splot
with pm3d.

I want to plot different 3d data (using dgrid3d) on a same graph (four
different surfaces that can be intersecting each other). 
I use the splot with pm3d in order to plot the four surfaces, and with set
pm3d depthorder, gnuplot manages nicely the surfaces drawing, as if there
was a z-buffer.
I also use transparent fill so we can see through each surface.

Now, I want each surface to have a wireframe on it. I use set pm3d hidden3d
<linestyle>  in order to do so, but in this case, all my four surfaces will
have the same line color.
However, I would like the wireframe of each surface have different colour.
How can I define different pm3d styles that I could use after during splot ?

Something looking like  splot "mydata" u 1:2:3 with pm3d style 1, '' u 1:2:4
with pm3d style 2, ...

Is it possible ?

I can of course plot one surface, change the style of pm3d, and then plot a
second surface... But, in this case, the ordering of the surfaces is no more
correctly made (the last drawn surface is on top of all the others).

Thanks in advance for any help,
John

My Gnuplot is Version 4.4 patchlevel 0-rc1
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[Gnuplot-info] Regarding GNU plot executable for Unix, Linux and Windows

[Nagesh S. S. <nag...@or...>]

Hi, 

 

Can you please help us in locating the download for GNU plot executables version 4.0 and 4.2 for Windows/AIX/Linux/Solaris.

 

 

Regards,

Nagesh V. Shetty

 

Oracle logo.gif
Nagesh V Shetty | Reveleus | Product Engineering, 

Oracle Financial Services,

Bangalore, India

 

Oracle Financial Services Software Limited was formerly i-flex solutions limited.

 

Re: [Gnuplot-info] how to set line styles for 20 different lines using "lt" with 20 different colors or 20 different plain patterns

[Thomas S. <t.s...@fz...>]

there are 10 different linetypes predefined.
if you need more you may define new line styles - just combine
the 10 dash patterns with different colors and linewidths.

see
http://www.gnuplot.info/docs/node237.html


peggyhyli wrote:
> 
> I would like to know how to set line styles for postscript for 20
> different color lines (different line patterns) using "lt" with gnuplot.
> 

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Re: [Gnuplot-info] splot and partial data

[Thomas S. <t.s...@fz...>]

you are only plotting one surface and your color specification is
not correct (linecolor rgb "#aabbcc")

you don't need any linecolor, linewidth, title, ... options when 'plotting'
into a table:
splot "data.txt" using 1:2:5, "data.txt" using 1:2:4
is sufficient.

have a look at the 'table' file with a normal text editor - you will
realize that there are isolines for 2 surfaces, separated by a double
linefeed.
and - there are only 3 numbers for each data point - only
'using 1:2:3' will work.

your plot command will have to plot 2 surfaces, selected using the
'index' option:
splot 'tmp2.dat' using 1:2:3 index 0 with lines title "w1s" lc rgb "#005500"
linewidth 2.5, 'tmp2.dat' using 1:2:3  index 1 with lines title "w1"  lc rgb
"#000000" linewidth 2.5


I'm using GNUPLOT 4.2 patchlevel 2 for Windows (32 BIT).
Here is my complete code:

set xrange[4:11];
set yrange [3:*];
set xlabel "r";
set ylabel "d";
set zlabel "sec";
set dgrid3d;
set table 'tmp2.dat';
splot "data.txt" using 1:2:5 with lines title "w1s"  lc rgb "#005500" 
linewidth 2.5, "data.txt" using 1:2:4 with lines title "w1"  lc rgb
"#000000" linewidth 2.5;
unset table;
unset dgrid3d;
set key left;
splot 'tmp2.dat' using 1:2:($1>$2?$3:0/0)  with lines title "w1s"  lc
"#005500"  linewidth 2.5, 'tmp2.dat' using 1:2:($1>$2?$4:0/0)  with lines
title "w1"  lc "#000000" linewidth 2.5;

the output should produce one plot in green and one in black. However, they
are both the same. The data-File is as follows:

4, 3, 0, 0.086000, 0.125000
6, 3, 0, 0.515000, 0.397500
6, 5, 0, 0.374500, 0.296000
8, 3, 0, 2.871000, 1.645000
8, 5, 0, 22.682500, 12.909000
10, 3, 0, 9.391000, 5.679000




Thomas Sefzick wrote:
> 
> i'm unable to reproduce this. please provide the gnuplot version
> you are using and information about which terminal you are using.
> 
> 
> trailblazerger wrote:
>> 
>> This works fine. However: you can't use colors this way for several
>> plots, i.e.
>> 
>> ...
>> splot 'tmp.dat' using 1:2:($1>$2?$3:0/0) with lines  lc rgb "#666666",
>> 'tmp.dat' using 1:2:($1>$2?$3:0/0) with lines  lc rgb "#000000";
>> 
>> 
>> just produces two black plots which is confusing.
>> 
>> 
>> 
>> Thomas Sefzick wrote:
>>> 
>>> 1st plot into a table:
>>> 
>>> set dgrid3d
>>> set table 'tmp.dat'
>>> splot "myfile.txt" using 1:2:3 ...
>>> unset table
>>> 
>>> then use this table as datafile for the final 'splot' command
>>> omitting all points with r<=d :
>>> 
>>> unset dgrid3d
>>> splot 'tmp.dat' using 1:2:($1>$2?$3:0/0) ...
>>> 
>>> 
>>> 
>> 
>> 
> 
> 

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[Gnuplot-info] how to set line styles for 20 different lines using "lt" with 20 different colors or 20 different plain patterns

[peggyhyli <peg...@go...>]

I would like to know how to set line styles for postscript for 20 different
color lines (different line patterns) using "lt" with gnuplot.
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[Gnuplot-info] how to set line styles for the different line (colors and patterns) for example for 20 different color lines

[Peggy Li <peg...@go...>]

Hi

I want to set line styles for 20 different lines (i.e., 20 different colors
with different line patterns) using "lt" but for 20 different colors for
postscript. Would appreciate if you can could advise me how to do it.

thanks.

Re: [Gnuplot-info] splot and partial data

[trailblazerger <han...@go...>]

I'm using GNUPLOT 4.2 patchlevel 2 for Windows (32 BIT).
Here is my complete code:

set xrange[4:11];
set yrange [3:*];
set xlabel "r";
set ylabel "d";
set zlabel "sec";
set dgrid3d;
set table 'tmp2.dat';
splot "data.txt" using 1:2:5 with lines title "w1s"  lc rgb "#005500" 
linewidth 2.5, "data.txt" using 1:2:4 with lines title "w1"  lc rgb
"#000000" linewidth 2.5;
unset table;
unset dgrid3d;
set key left;
splot 'tmp2.dat' using 1:2:($1>$2?$3:0/0)  with lines title "w1s"  lc
"#005500"  linewidth 2.5, 'tmp2.dat' using 1:2:($1>$2?$4:0/0)  with lines
title "w1"  lc "#000000" linewidth 2.5;

the output should produce one plot in green and one in black. However, they
are both the same. The data-File is as follows:

4, 3, 0, 0.086000, 0.125000
6, 3, 0, 0.515000, 0.397500
6, 5, 0, 0.374500, 0.296000
8, 3, 0, 2.871000, 1.645000
8, 5, 0, 22.682500, 12.909000
10, 3, 0, 9.391000, 5.679000




i'm unable to reproduce this. please provide the gnuplot version
you are using and information about which terminal you are using.


trailblazerger wrote:
> 
> This works fine. However: you can't use colors this way for several plots,
> i.e.
> 
> ...
> splot 'tmp.dat' using 1:2:($1>$2?$3:0/0) with lines  lc rgb "#666666",
> 'tmp.dat' using 1:2:($1>$2?$3:0/0) with lines  lc rgb "#000000";
> 
> 
> just produces two black plots which is confusing.
> 
> 
> 
> Thomas Sefzick wrote:
>> 
>> 1st plot into a table:
>> 
>> set dgrid3d
>> set table 'tmp.dat'
>> splot "myfile.txt" using 1:2:3 ...
>> unset table
>> 
>> then use this table as datafile for the final 'splot' command
>> omitting all points with r<=d :
>> 
>> unset dgrid3d
>> splot 'tmp.dat' using 1:2:($1>$2?$3:0/0) ...
>> 
>> 
>> 
> 
> 

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Re: [Gnuplot-info] How to plot HeatMap by ourselves?

[Thomas S. <t.s...@fz...>]

gnuplot uses the z-value as gray-value and then converts the gray-value
into a color by using a palette.

have a look at
http://www.gnuplot.info/docs/node215.html
or get the gnuplot source code and figure out how the color mapping
is done.


WEI Dong-2 wrote:
> 
> Hello,
> 
> I want to plot some data in my own program, just like using the "set pm3d
> map" statement in gnuplot.
> But I find that it is very complicated to transfer from a double value to
> a RGB triple.
> It is not linear, and not symmetrical among R, G and B.
> 
> Could you tell me the formula?
> 
> Thank you very much!
> 
> WEI Dong
> ------------------------------------------------------------------------------
> The Planet: dedicated and managed hosting, cloud storage, colocation
> Stay online with enterprise data centers and the best network in the
> business
> Choose flexible plans and management services without long-term contracts
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> gnuplot-info mailing list
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> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
> 
> 

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Re: [Gnuplot-info] splot and partial data

[Thomas S. <t.s...@fz...>]

i'm unable to reproduce this. please provide the gnuplot version
you are using and information about which terminal you are using.


This works fine. However: you can't use colors this way for several plots,
i.e.

...
splot 'tmp.dat' using 1:2:($1>$2?$3:0/0) with lines  lc rgb "#666666",
'tmp.dat' using 1:2:($1>$2?$3:0/0) with lines  lc rgb "#000000";


just produces two black plots which is confusing.



Thomas Sefzick wrote:
> 
> 1st plot into a table:
> 
> set dgrid3d
> set table 'tmp.dat'
> splot "myfile.txt" using 1:2:3 ...
> unset table
> 
> then use this table as datafile for the final 'splot' command
> omitting all points with r<=d :
> 
> unset dgrid3d
> splot 'tmp.dat' using 1:2:($1>$2?$3:0/0) ...
> 
> 
> 

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Re: [Gnuplot-info] splot and partial data

[trailblazerger <han...@go...>]

This works fine. However: you can't use colors this way for several plots,
i.e.

...
splot 'tmp.dat' using 1:2:($1>$2?$3:0/0) with lines  lc rgb "#666666",
'tmp.dat' using 1:2:($1>$2?$3:0/0) with lines  lc rgb "#000000";


just produces two black plots which is confusing.



1st plot into a table:

set dgrid3d
set table 'tmp.dat'
splot "myfile.txt" using 1:2:3 ...
unset table

then use this table as datafile for the final 'splot' command
omitting all points with r<=d :

unset dgrid3d
splot 'tmp.dat' using 1:2:($1>$2?$3:0/0) ...


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Re: [Gnuplot-info] automatic iteration plot - folder name

[Hans-Bernhard B. <HBB...@t-...>]

Nunzio Losacco wrote:
> plot for[i=1:4]  i."/namefile" u 1:3 w linespoints
> 
> but then I get:
> 
>         internal error : STRING operator applied to non-STRING type

[...]

> plot for[i=1:3] "namefile".i u 1:3 w linesp

The difference that makes this work is that this time you _started_ with 
a string, so gnuplot knows that 'i' has to be converted to one.  But 
this mechanism doesn't work for an operand that begins an expression.

IIRC,

	"".i.""/namefile"

should work.

Re: [Gnuplot-info] automatic iteration plot - folder name

[Thomas S. <t.s...@fz...>]

use the 'sprintf()' function or put an empty string in front:
"".i."/namefile"


warpino wrote:
> 
> Hi all,
> 
> I want to plot some files with the same name located in some progressively
> number folders (i.e.: 1, 2, 3, 4 ...) all at the same path level. So,
> starting from the parent directory I do a
> 
> plot for[i=1:4]  i."/namefile" u 1:3 w linespoints
> 
> but then I get:
> 
>         internal error : STRING operator applied to non-STRING type
> 
> Is there a way to solve this? It is a bit strange, cause if I have some
> progressively numbered files, instead:  namefile1, namfile2, namfile3, and
> so forth, I can do - from the directory where files are:
> 
> plot for[i=1:3] "namefile".i u 1:3 w linesp
> 
> and get the result I want. Do you have any idea?
> 
> Thanks,
> 
> N.
> ------------------------------------------------------------------------------
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> 
> 

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[Gnuplot-info] automatic iteration plot - folder name

[Nunzio L. <nun...@gm...>]

Hi all,

I want to plot some files with the same name located in some progressively
number folders (i.e.: 1, 2, 3, 4 ...) all at the same path level. So,
starting from the parent directory I do a

plot for[i=1:4]  i."/namefile" u 1:3 w linespoints

but then I get:

        internal error : STRING operator applied to non-STRING type

Is there a way to solve this? It is a bit strange, cause if I have some
progressively numbered files, instead:  namefile1, namfile2, namfile3, and
so forth, I can do - from the directory where files are:

plot for[i=1:3] "namefile".i u 1:3 w linesp

and get the result I want. Do you have any idea?

Thanks,

N.

[Gnuplot-info] How to plot HeatMap by ourselves?

[WEI D. <don...@un...>]

Hello,

I want to plot some data in my own program, just like using the "set pm3d map" statement in gnuplot.
But I find that it is very complicated to transfer from a double value to a RGB triple.
It is not linear, and not symmetrical among R, G and B.

Could you tell me the formula?

Thank you very much!

WEI Dong

Re: [Gnuplot-info] Regarding GNU plot executable for AIX and Windows

[Hans-Bernhard B. <HBB...@t-...>]

Suresh Singh wrote:

> Can you please help us in locating the download for GNU plot
 > executables version 4.0 and 4.2 for Windows/AIX/Linux/Solaris.

Windows executables are at our project download page at SourceForge.net. 
    Linux has distributors.
Unix people are generally expected to build their own.

Re: [Gnuplot-info] Building from source with PDF functionality

[Tatsuro M. <tma...@ya...>]

Hello

> 
> I am attempting to build gnuplot from source so that I can include the PDF
> libraries required to allow for the output terminal to be assigned to a .pdf
> file and have a few questions:
> 
> Firstly, libpdf is mentioned frequently in documentation, however the
> makefiles seem to require pdflib. Did gnuplot ever support libpdf and if so,
> has that now been removed and replaced with pdflib?
> 
> If libpdf is not supported, is there an open source pdf library available? I
> would rather not pay to use pdflib.

If you would to creat pdf file, I recommend to use pdfcairo terminal (the cairo based terminal for
pdf).
It is free to use and the anti-alias cario based give a smooth graph.

It requires recent cairo, pango,  glib, and intl (freetype, fontconfig?) (linpng, this is required for
pngcairo but not pdfcairo. But it is also useful for creating png files). If I omit some dependency
please forgive me.

Regards

Tatsuro

--------------------------------------
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Re: [Gnuplot-info] GNUPLOT - Fitting Multiple Text files

[Hans-Bernhard B. <HBB...@t-...>]

super zach wrote:
> Hi all
> 
> I am trying to fit a function that takes data from two files.  Is there a
> way to do this using GNUPLOT?

The request, as written, doesn't make sense.

> I am trying to fit a lightcurve by considering light coming from two
> sources, lets call them A & B.  

What do you consider a "light curve"?

> I thus have two text files A.dat & B.dat that each contain three columns:
> time / flux / flux error
> 
> I have an equation I want to fit to these data files that roughly equates to
> (though is actually more complicated):
> 
> total_flux(x) = K*flux_A(x) + L*flux_B(x)         where K & L are constants
> I want to determine by fitting.

And where do you intend total_flux(x) to come from?

I don't think your description of what you're trying to do is workable, 
most likely because you've reduced it too far from what you're actually 
trying todo.

You'll have to show an actual, complete example.  What are those 
functions, what do they have to do with the data files, and what is it 
you're actually trying to achive?

Re: [Gnuplot-info] GNUPLOT - Fitting Multiple Text files

[Thomas S. <t.s...@fz...>]

the light flux from the two light sources seems to be totally independent,
that's what the function
> total_flux(x) = K*flux_A(x) + L*flux_B(x)
suggests. so there is no need to do a combined fit. just fit the two
curves separately.

otherwise, if the x-values are all the same in corresponding lines of both
data sets, you may combine the data sets outside of gnuplot and then
work with the combined data file. on unix-like system you may use the
'join' command.


super zach wrote:
> 
> Hi all
> 
> I am trying to fit a function that takes data from two files.  Is there a
> way to do this using GNUPLOT?
> 
> For example:  
> 
> I am trying to fit a lightcurve by considering light coming from two
> sources, lets call them A & B.  
> 
> I thus have two text files A.dat & B.dat that each contain three columns:
> time / flux / flux error
> 
> I have an equation I want to fit to these data files that roughly equates
> to (though is actually more complicated):
> 
> total_flux(x) = K*flux_A(x) + L*flux_B(x)         where K & L are
> constants I want to determine by fitting.
> 
> Is there a way to do this?  I have discovered "fit multi-branch" but that
> seems to fit the same equation to two datasets, which is not the same as
> what I am trying to do here.
> 
> Many thanks in advance.
> 
> Best,
> Zach
> 

-- 
View this message in context: http://old.nabble.com/GNUPLOT---Fitting-Multiple-Text-files-tp27355951p27358534.html
Sent from the Gnuplot - User mailing list archive at Nabble.com.

[Gnuplot-info] Building from source with PDF functionality

[Ash_2608 <ash...@gm...>]

I am attempting to build gnuplot from source so that I can include the PDF
libraries required to allow for the output terminal to be assigned to a .pdf
file and have a few questions:

Firstly, libpdf is mentioned frequently in documentation, however the
makefiles seem to require pdflib. Did gnuplot ever support libpdf and if so,
has that now been removed and replaced with pdflib?

If libpdf is not supported, is there an open source pdf library available? I
would rather not pay to use pdflib.


Thanks!
-- 
View this message in context: http://old.nabble.com/Building-from-source-with-PDF-functionality-tp27358234p27358234.html
Sent from the Gnuplot - User mailing list archive at Nabble.com.

[Gnuplot-info] GNUPLOT - Fitting Multiple Text files

[super z. <zac...@ya...>]

Hi all

I am trying to fit a function that takes data from two files.  Is there a
way to do this using GNUPLOT?

For example:  

I am trying to fit a lightcurve by considering light coming from two
sources, lets call them A & B.  

I thus have two text files A.dat & B.dat that each contain three columns:
time / flux / flux error

I have an equation I want to fit to these data files that roughly equates to
(though is actually more complicated):

total_flux(x) = K*flux_A(x) + L*flux_B(x)         where K & L are constants
I want to determine by fitting.

Is there a way to do this?  I have discovered "fit multi-branch" but that
seems to fit the same equation to two datasets, which is not the same as
what I am trying to do here.

Many thanks in advance.

Best,
Zach
-- 
View this message in context: http://old.nabble.com/GNUPLOT---Fitting-Multiple-Text-files-tp27355951p27355951.html
Sent from the Gnuplot - User mailing list archive at Nabble.com.

Re: [Gnuplot-info] C++/gnuplot pipeline issue

[Philipp K. J. <ja...@ie...>]

On Wednesday 27 January 2010 12:01:33 am ZoltánVörös wrote:
> > Maybe somebody can help me out.
> >
> > I have a C++ program which I want to pipe data to gnuplot such that it
> > can display a graph of what is happening as a simulation runs. The
> > pipeline itself works fine. What the trouble seems to be is that the
> > program writes the data I want displayed to a file which it then commands
> > gnuplot to plot. This mostly works, only gnuplot sporadically tells me
> > that it cannot plot the datafile because there are no valid points. If I
> > step through the program one graph at a time it works fine.
> >
> > My only suspicion is that gnuplot could be looking for the datafile
> > before it has been written to the hard drive and is available again, even
> > though C++ is definitely closing and flushing the stream that writes the
> > data. Is this likely to be the problem or have I overlooked something? Is
> > there any way to solve this?

C++ may have written and flushed, but that does
not guarantee that the OS has done likewise!

I think most solutions to this problem will involve
some sort of wrapper script, which will check 
whether the file is really there and then do some
renaming magic. (You might even roll the same
functionality into your C++ program.)

Alternatively, you can go w/ Zoltan's proposal,
which cuts out the disk altogether (in other
words, start gnuplot as a subprocess of your
C++ program and pipe to it). Assuming you work
on Linux/Unix.

> >
> > Thanks,
> > Beleaguered PhD student
>
> Hello Chris,
>
> It might be too late for you (I haven't read the forum recently), but I was
> wondering whether you could try to pipe the data, too. I did this on the
> command line
>
> echo -e "plot '-' w l\n1 1\n2 3\n e" | gnuplot -persist
>
> The point is that the data is not written to the disc, so if you can pipe
> the data, and tell gnuplot to take it from the prompt, then you shouldn't
> have the problem that you described.
> I hope this helps,
> Zoltán
>
>
>
>
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