gnuplot-info — For questions and discussion about gnuplot

Re: [Gnuplot-info] Surface fit

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

if your data are expected to be on a surface which you are able
to describe with a function, then you could fit this function to
your data.

but if your data are non-gridded and you are looking for some
interpolation mechanism have a look at
http://www.gnuplot.info/docs/node177.html
http://gnuplot.sourceforge.net/demo/scatter.html


xabi wrote:
> 
> Thomas Sefzick a écrit :
>> yes, it's possible, have a look at
>> http://www.gnuplot.info/docs/node82.html
> 
> Hi,
> 
> Actually, I'm sure that the fit fonction is what I'm looking for.
> 
> I have a "cloud" of points x,y,z.
> 
> I am using
> splot "file.dat" us 1:2:3
> 
> And I would like to know if there is an existing fonction which fill the 
> gap between the points.
> 
> Thanks for yor help,
> 
> xabi
> 

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Re: [Gnuplot-info] Plot questions

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

joachim heintz wrote:
> 
> Thanks a lot for your help. The palette is working now. Unfortunately  
> I have now a large color palette on the right side of my plot. How can  
> I get rid of it?
> 

'unset colorbox'
see
http://www.gnuplot.info/docs/node167.html


joachim heintz wrote:
> 
> And until now I couldn't find a way to show my first column as a  
> label. Something like 'set label $1' - but what is the correct syntax  
> for it?
> 

to get a data value as a key - within one plot command - first do
a dummy plot to get this data value into a variable, and then use
this variable for the 'title' of the next plot:

plot "myfile.txt" every ::1::1 using (my_key=sprintf("%d",$1),0/0):(0/0)
notitle, \
"" every ::1::1 using 3:2 with imp title my_key linecolor palette frac 0.0,
\
"" every ::1::1 using 6:5 with imp notitle palette frac 0.1, \
...

to get this data value as a label is a little more complicated because
you need to do a complete dummy plot (e.g. into a 'dumb' terminal),
then define the label, and afterward do the real plot:

set terminal push
set terminal dumb
plot "myfile.txt" every ::1::1 (my_key=sprintf("%d",$1),0/0):(0/0)
set label 1 my_key at ...
set terminal pop
set output "output_filename"
plot "myfile.txt" every ::1::1 using 3:2 with imp notitle linecolor palette
frac 0.0, \
"" every ::1::1 using 6:5 with imp notitle palette frac 0.1 notitle, \
...


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Re: [Gnuplot-info] Surface fit

[Xavier P. <pes...@cr...>]

Xavier Pessoles a écrit :
>
> Actually, I'm sure that the fit fonction is what I'm looking for.
              ^^^^^
... I'm not sure ...

Re: [Gnuplot-info] Surface fit

[Xavier P. <pes...@cr...>]

Thomas Sefzick a écrit :
> yes, it's possible, have a look at
> http://www.gnuplot.info/docs/node82.html

Hi,

Actually, I'm sure that the fit fonction is what I'm looking for.

I have a "cloud" of points x,y,z.

I am using
splot "file.dat" us 1:2:3

And I would like to know if there is an existing fonction which fill the 
gap between the points.

Thanks for yor help,

xabi

Re: [Gnuplot-info] Plot questions

[joachim h. <jh...@jo...>]

Thanks a lot for your help. The palette is working now. Unfortunately  
I have now a large color palette on the right side of my plot. How can  
I get rid of it?
And until now I couldn't find a way to show my first column as a  
label. Something like 'set label $1' - but what is the correct syntax  
for it?
	joachim



Am 11.05.2009 um 17:56 schrieb Thomas Sefzick:

>
> define a palette which goes from 'red' to 'blue, see
> http://www.gnuplot.info/docs/node215.html
>
> and then plot with explicit line colors
>
> plot "myfile.txt" every ::1::1 using 3:2 with imp linecolor palette  
> frac
> 0.0, \
> "" every ::1::1 using 6:5 with imp notitle palette frac 0.1, \
> "" every ::1::1 using 9:8 with imp notitle palette frac 0.2, \
> ...
>
> for more information, see
> http://www.gnuplot.info/docs/node62.html
>
>
> joachim heintz wrote:
>>
>> Hello -
>>
>> I'm new in gnuplot. I wrote a script which reads single lines with  
>> the
>> "every" option. This works well, but I have two questions:
>> 1) I'd love to have the value which is written in column 1 (which  
>> is a
>> time in my case) as the legend (key). Is this possible?
>> 2) I have several xy-pairs in a line. I plot them with
>> 	"myfile.txt" every ::1::1 using 3:2 with imp,\
>> 	"" every ::1::1 using 6:5 with imp notitle,\
>> 	"" every ::1::1 using 9:8 with imp notitle,\
>> and so on. Can I change the colors in a way that the first xy-pair
>> (using 3:2 in the example above) is in red colour, and then the color
>> circle is crossed so that the last value is blue? (There are  
>> different
>> numbers of pairs; sometimes 6 or 12 or whatever. In each case the
>> first xy-value should be red and the last blue.)
>>
>> Thanks for any help. Best regards -
>>
>> 	joachim
>>
>> ------------------------------------------------------------------------------
>> The NEW KODAK i700 Series Scanners deliver under ANY circumstances!  
>> Your
>> production scanning environment may not be a perfect world - but  
>> thanks to
>> Kodak, there's a perfect scanner to get the job done! With the NEW  
>> KODAK
>> i700
>> Series Scanner you'll get full speed at 300 dpi even with all image
>> processing features enabled. http://p.sf.net/sfu/kodak-com
>> _______________________________________________
>> Gnuplot-info mailing list
>> Gnu...@li...
>> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
>>
>>
>
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>
>
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> thanks to
> Kodak, there's a perfect scanner to get the job done! With the NEW  
> KODAK i700
> Series Scanner you'll get full speed at 300 dpi even with all image
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Re: [Gnuplot-info] temperature on x axis and corresponding inverse temperature on x2 axis

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

you could define the x2tic labels by hand (or generate them with a
program.
e.g. for a xaxis range [1:100] you could set:
set x2range [1:100]
set x2tics (sprintf("%.4f",1./10.) 10, sprintf("%.4f",1./20.) 20, \
sprintf("%.4f",1./30.) 30, sprintf("%.4f",1./40.) 40, \
sprintf("%.4f",1./50.) 50, sprintf("%.4f",1./60.) 60, \
sprintf("%.4f",1./70.) 70, sprintf("%.4f",1./80.) 80, \
sprintf("%.4f",1./90.) 90, sprintf("%.4f",1./100.) 100)


fredfriend wrote:
> 
> Hi,
> 
> Is there a way within gnuplot (>=4.3) to put the inverse of the x axis
> values on the x2 axis?
> 
> set x2range [1/xmin : 1xmax]    doesn't work, because it still does a
> linear relation of the points in between these two extremes. I would need
> THE WHOLE x2 axis as an inverse.
> 
> The only work around I can think of is to add another column to the data
> file with a value of 1/x for all the rows (i.e. all x axis values) and do
> a   plot "datafile" u 1:2:x2ticlabels(column)     but this can only put
> tickmarks where the data points are, and nothing in between.
> 
> any suggestions?
> 
> thanks!
> 
> 

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Re: [Gnuplot-info] Surface fit

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

yes, it's possible, have a look at
http://www.gnuplot.info/docs/node82.html


xabi wrote:
> 
> Hi, 
> 
> I have a file of data with x,y,z.
> 
> I can plot them by using 
> splot "xyz" us 1:2:3
> 
> I would like to know if it is possible to do a surface fit with gnuplot.
> 
> 
> Thanks.
> 
> xabi
> 

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Re: [Gnuplot-info] How to plot functions smoother?

[Dr. I. D. J. <die...@t-...>]

Dear Stimrol,
ok, I can serve you with examples and a description shortly, however, I need 
to know whether you're working with windows or with linux, as the solutions 
are quite similar but not indentical in both cases. 
Let me know and I'll send you my suggestions on how to solve your issues.

Take care




Dieter Jurzitza

-- 
-----------------------------------------------------------

                               |
                                \
                 /\_/\           |
                | ~x~ |/-----\   /
                 \   /-       \_/
  ^^__   _        /  _  ____   /
 <°°__ \- \_/     |  |/    |  |
  ||  ||         _| _|    _| _|

if you really want to see the pictures above - use some font
with constant spacing like courier! :-)
-----------------------------------------------------------

Re: [Gnuplot-info] least-square fit in Gnuplot

[oral <bes...@li...>]

ok, I have 2 sets of data, that are supposed to measure the same thing, but
with different methods, which means that ideally the relation would be
linear... but my plot shows scattered points all over the place, so I was
trying to find a function that fits the larger number of values... does it
make sense now?




Hans-Bernhard Bröker-2 wrote:
> 
> oral wrote:
>> Does anyone know how to find the best least square fit in Gnuplot? %-|
> 
> As general as you ask it, that question is impossible to answer.  There 
> is no single best way of doing fits.
> 
> ------------------------------------------------------------------------------
> Crystal Reports - New Free Runtime and 30 Day Trial
> Check out the new simplified licensing option that enables 
> unlimited royalty-free distribution of the report engine 
> for externally facing server and web deployment. 
> http://p.sf.net/sfu/businessobjects
> _______________________________________________
> Gnuplot-info mailing list
> Gnu...@li...
> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
> 
> 

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Re: [Gnuplot-info] least-square fit in Gnuplot

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

oral wrote:
> Does anyone know how to find the best least square fit in Gnuplot? %-|

As general as you ask it, that question is impossible to answer.  There 
is no single best way of doing fits.

Re: [Gnuplot-info] How to plot functions smoother?

[stimorol <sa...@go...>]

Dr. Ing. Dieter Jurzitza wrote:
> 
> Hi Dieter!
> I need plots of functions (many functions sin, cos, x^2,cosh,...) in png
> format. There is no problem to convert them to png if it is better to
> create the output in some other format. The main point is that they should
> look very nice, ( the pupils should like them) like the example on
> wikipedia I posted above.
> I use also LaTeX. If the LaTeX output delivers better pictures I would do
> it that way and than cut them from the pdf output of LaTeX-file. 
> 
> thanks
> 
> 
> 
> Hi Stimorol,
> what file format are you actually looking for? AFAIK gnuplot is a very 
> flexible tool to create graphs of any kind, but the terminals differ with 
> regard to their capabilities. And a bitmap like a png is always limited to 
> some extend.
> _if_ you are looking for a LaTeX / TeX integration (this is what the
> second 
> part of your message is telling me ....) I would suggest a different
> terminal 
> - please feed back and I can probably help.
> Take care
> 
> 
> 
> Dieter
> 
> Am Samstag 16 Mai 2009 18:22:19 schrieb stimorol:
>> Hello!
>>
>> I have a problem. I want to plot the tan(x) function in the same style as
>> it was done on wikipedia for cos and sin here
>> set yrange [-10.:10.]
>>
>> plot tan(x) lt rgb "blue" lw 2 title "{/=12 tan(x)}"
> ******
> 
> -- 
> -----------------------------------------------------------
> 
>                                |
>                                 \
>                  /\_/\           |
>                 | ~x~ |/-----\   /
>                  \   /-       \_/
>   ^^__   _        /  _  ____   /
>  <°°__ \- \_/     |  |/    |  |
>   ||  ||         _| _|    _| _|
> 
> if you really want to see the pictures above - use some font
> with constant spacing like courier! :-)
> -----------------------------------------------------------
> 
> 
> ------------------------------------------------------------------------------
> Crystal Reports - New Free Runtime and 30 Day Trial
> Check out the new simplified licensing option that enables 
> unlimited royalty-free distribution of the report engine 
> for externally facing server and web deployment. 
> http://p.sf.net/sfu/businessobjects
> _______________________________________________
> Gnuplot-info mailing list
> Gnu...@li...
> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
> 
> 

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[Gnuplot-info] least-square fit in Gnuplot

[oral <bes...@li...>]

Does anyone know how to find the best least square fit in Gnuplot? %-|
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Re: [Gnuplot-info] How to plot functions smoother?

[Dr. I. D. J. <die...@t-...>]

Hi Stimorol,
what file format are you actually looking for? AFAIK gnuplot is a very 
flexible tool to create graphs of any kind, but the terminals differ with 
regard to their capabilities. And a bitmap like a png is always limited to 
some extend.
_if_ you are looking for a LaTeX / TeX integration (this is what the second 
part of your message is telling me ....) I would suggest a different terminal 
- please feed back and I can probably help.
Take care



Dieter

Am Samstag 16 Mai 2009 18:22:19 schrieb stimorol:
> Hello!
>
> I have a problem. I want to plot the tan(x) function in the same style as
> it was done on wikipedia for cos and sin here
> set yrange [-10.:10.]
>
> plot tan(x) lt rgb "blue" lw 2 title "{/=12 tan(x)}"
******

-- 
-----------------------------------------------------------

                               |
                                \
                 /\_/\           |
                | ~x~ |/-----\   /
                 \   /-       \_/
  ^^__   _        /  _  ____   /
 <°°__ \- \_/     |  |/    |  |
  ||  ||         _| _|    _| _|

if you really want to see the pictures above - use some font
with constant spacing like courier! :-)
-----------------------------------------------------------

[Gnuplot-info] How to plot functions smoother?

[stimorol <sa...@go...>]

Hello!

I have a problem. I want to plot the tan(x) function in the same style as it
was done on wikipedia for cos and sin here
http://de.wikipedia.org/w/index.php?title=Datei:Sine_cosine_plot.svg&filetimestamp=20090410200628
http://de.wikipedia.org/w/index.php?title=Datei:Sine_cosine_plot.svg&filetimestamp=20090410200628 

but I have some broblems:
1. My function looks not really smooth and nice as on wikipedia
2. The name of the function, here tan(x), is crossed by the graph of the
function. how can I prevent this automatically?
3. I want to have \frac{\pi}{2},\frac{3 \pi}{2},..  on the x axis in the
LaTex style, but the only thing works is the "poor man" style \pi/2..

here is the code of my picture (+picture):

set term png size 360,245  nocrop enhanced font arial 9
set output "tan.png"
set samples 1000
set grid
unset border
http://www.nabble.com/file/p23575388/tan.png 
set xzeroaxis linetype -1 linewidth 1.5
set yzeroaxis linetype -1 linewidth 1.5

set xtics ("" -2.5*pi,"{/=11 {/Symbol -2p}}" -pi*2,"" -pi*3/2,"{/=11{/Symbol
-p}}" -pi,"" -pi*1/2, "{/=11 0}" 0, "" pi*1/2,"{/=11{/Symbol p}}" pi,""
pi*3/2,"{/=11{/Symbol 2p}}" pi*2, ""  2.5*pi)
set ytics ("{/=11 {/Symbol -10}}" -10,"{/=11 0}" 0,"{/=11 {/Symbol 10}}" 10)

set xrange [-2.5*pi:2.5*pi]
set yrange [-10.:10.]

plot tan(x) lt rgb "blue" lw 2 title "{/=12 tan(x)}" 




hmmm 
during writing this text I realized that the pictute on wikipedia was
created in the .svg format (never heared before), so I created it too and
opened withe the program Inkscape. the lines are now smooth, but the x- and
y- axis disappeared inthe svg-format. problems...:confused:


Last request :blush:
if some knows an easier (better?) open source program for generating good
looking graphs and other mathematical objects PLEASE:handshake: tell

thanks
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Re: [Gnuplot-info] x2tics set by data series

[Michael L. <mig...@gm...>]

Sorry for double posting, I figured out a better way to describe it.
It's simply a parametric plot like this:

#data.txt
x(t) y(t) t

and I want to somehow get t on the x2 axis.

On Thu, May 14, 2009 at 12:28:16PM -0600, Michael Lerch wrote:
> I know that subject is confusing.  Here's what I'd like to do:
> 
> I have a three column file and I want to plot $1 on x1 axis, $2 on y1
> axis and I want x2 axis to tell me what $3 is.  The problem is that $2
> and $3 are not related by any simple function (ie not
> linear/logarithmic).  Perhaps is there a simple way to make an x2 tic
> for every 100th point and have that tic be the value of the third
> column?
> 
> Thanks!

[Gnuplot-info] x2tics set by data series

[Michael L. <mig...@gm...>]

I know that subject is confusing.  Here's what I'd like to do:

I have a three column file and I want to plot $1 on x1 axis, $2 on y1
axis and I want x2 axis to tell me what $3 is.  The problem is that $2
and $3 are not related by any simple function (ie not
linear/logarithmic).  Perhaps is there a simple way to make an x2 tic
for every 100th point and have that tic be the value of the third
column?

Thanks!

Re: [Gnuplot-info] bars between coordinates, thickness variable

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

herrdeh wrote:
> 
> Now a second issue comes up:
> 
> I'd like to visualize the number of passengers between the different  
> bus tops. Data could be given in 3 columns: <number_of_passengers>,  
> <x-coordinate>, < y-coordinate>.
> 
> The number_of_passengers values should be expressed by the thickness  
> of the lines between the bus stops (expressed by coordinates).
> 
> How can I do that?
> 

you could draw each connection between subsequent bus stops separately,
with gnuplot 4.3-cvs you could use the 'for' loop.

let's assume, that each data line contains the number of passengers
leaving the bus stop at the coordinate given by x and y:

number_of_busstops = 10
plot "datafile" using 2:(my_lw=$1, 0/0) every 1::0::0 notitle, \
   for [i=1:number_of_busstops] "" using 2:(my_lw=$1, $3) \
   every 1::(i-1)::i with lines linetype 1 linewidth my_lw notitle

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[Gnuplot-info] bars between coordinates, thickness variable

[Wolf D. <dre...@ve...>]

Hello everybody,

I could finish my x-y-z-plot happily - thanks, this will be very  
useful for my work.

Now a second issue comes up:

I'd like to visualize the number of passengers between the different  
bus tops. Data could be given in 3 columns: <number_of_passengers>,  
<x-coordinate>, < y-coordinate>.

The number_of_passengers values should be expressed by the thickness  
of the lines between the bus stops (expressed by coordinates).

How can I do that?

Greetings,

Wolf

Re: [Gnuplot-info] x-y-z plot, z-value by dot-size?

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

just shift the x-position of the labels:
plot "datafile" with points linetype 1 pointtype 6 pointsize variable, \
"" using ($1+$3*0.04):2:3 with labels notitle


herrdeh wrote:
> 
> Hello everybody,
> 
> I'm making further progress - I'm quite close to my goal.
> 
> One further detail:
> 
> I'd like to have the labels outside the edge of the circles - means  
> the offset should be diameter-dependent - in a ratio to the value of  
> one of the columns.
> 
> I tried something like
> 
> labels center offset ($1/10),0
> 
> column 1 is containing the relevant values. But this doesnt work.
> 
> Does anybody have an idea?
> 
> Thanks and greetings,
> 
> Wolf
> 
> 
> 
> ------------------------------------------------------------------------------
> The NEW KODAK i700 Series Scanners deliver under ANY circumstances! Your
> production scanning environment may not be a perfect world - but thanks to
> Kodak, there's a perfect scanner to get the job done! With the NEW KODAK
> i700
> Series Scanner you'll get full speed at 300 dpi even with all image 
> processing features enabled. http://p.sf.net/sfu/kodak-com
> _______________________________________________
> Gnuplot-info mailing list
> Gnu...@li...
> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
> 
> 

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Re: [Gnuplot-info] x-y-z plot, z-value by dot-size?

[Wolf D. <dre...@ve...>]

Hello everybody,

I'm making further progress - I'm quite close to my goal.

One further detail:

I'd like to have the labels outside the edge of the circles - means  
the offset should be diameter-dependent - in a ratio to the value of  
one of the columns.

I tried something like

labels center offset ($1/10),0

column 1 is containing the relevant values. But this doesnt work.

Does anybody have an idea?

Thanks and greetings,

Wolf

Re: [Gnuplot-info] x-y-z plot, z-value by dot-size?

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

herrdeh wrote:
> 
> Hello,
> 
> I went a big bit ahead! - Wow, thanks a lot.
> 
> I used
> 
> plot [60:120] [60:120] "Lage-HST-Herzo.csv" using 1:2:4 with points  
> pointtype 5 pointsize variable
> 
> to make it look quite close to what I want.
> Now there are some details remaining:
> 
> * How can I avoid the axes to be plotted?
> 

unset border
unset xtics
unset ytics


herrdeh wrote:
> 
> * How can I make the "points" look like circles?
> 

have a look at the 'test' command (instead of 'plot'),
it shows the capabilities of the terminal you are using.

circles: pointtype 6


herrdeh wrote:
> 
> * How can I plot the figure in column 4 (which contains the point  
> size = number of boarding passengers) besides each point?
> 

plot 'with labels', see
http://www.gnuplot.info/docs/node145.html
and
http://gnuplot.sourceforge.net/demo/datastrings.html


herrdeh wrote:
> 
> Thanks a lot and greetings,
> 
> Wolf
> 

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Re: [Gnuplot-info] x-y-z plot, z-value by dot-size?

[Wolf D. <dre...@ve...>]

Hello,

I went a big bit ahead! - Wow, thanks a lot.

I used

plot [60:120] [60:120] "Lage-HST-Herzo.csv" using 1:2:4 with points  
pointtype 5 pointsize variable

to make it look quite close to what I want.
Now there are some details remaining:

* How can I avoid the axes to be plotted?
* How can I make the "points" look like circles?
* How can I plot the figure in column 4 (which contains the point  
size = number of boarding passengers) besides each point?

Thanks a lot and greetings,

Wolf

Re: [Gnuplot-info] Plot questions

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

define a palette which goes from 'red' to 'blue, see
http://www.gnuplot.info/docs/node215.html

and then plot with explicit line colors

plot "myfile.txt" every ::1::1 using 3:2 with imp linecolor palette frac
0.0, \
"" every ::1::1 using 6:5 with imp notitle palette frac 0.1, \
"" every ::1::1 using 9:8 with imp notitle palette frac 0.2, \
...

for more information, see
http://www.gnuplot.info/docs/node62.html


joachim heintz wrote:
> 
> Hello -
> 
> I'm new in gnuplot. I wrote a script which reads single lines with the  
> "every" option. This works well, but I have two questions:
> 1) I'd love to have the value which is written in column 1 (which is a  
> time in my case) as the legend (key). Is this possible?
> 2) I have several xy-pairs in a line. I plot them with
> 	"myfile.txt" every ::1::1 using 3:2 with imp,\
> 	"" every ::1::1 using 6:5 with imp notitle,\
> 	"" every ::1::1 using 9:8 with imp notitle,\
> and so on. Can I change the colors in a way that the first xy-pair  
> (using 3:2 in the example above) is in red colour, and then the color  
> circle is crossed so that the last value is blue? (There are different  
> numbers of pairs; sometimes 6 or 12 or whatever. In each case the  
> first xy-value should be red and the last blue.)
> 
> Thanks for any help. Best regards -
> 
> 	joachim
> 
> ------------------------------------------------------------------------------
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> _______________________________________________
> Gnuplot-info mailing list
> Gnu...@li...
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> 
> 

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Re: [Gnuplot-info] x-y-z plot, z-value by dot-size?

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

plot 'datafile' using 1:2:3 with points pointtype 5 pointsize variable

(the 'using 1:2:3" is not really needed in your case)
for more information, see
http://www.gnuplot.info/docs/node145.html


herrdeh wrote:
> 
> Hello everybody out there,
> 
> I managed to install gnuplot on a mac - wow, how proud am I… ((-;
> 
> Now the fun stuff is over and I have to turn towards work… )-:
> 
> Beeing a public transport consultant, I want to plot a map of the numbers
> of boarding passengers at each bus stop within a small bus network. There
> are the geographic coordinates of the bus stops (x and y values) and the
> numbers of boarding passengers (sort of the z values) - but it should not
> make a 3D graph, the z value should be represented by the dot size in the
> (x;y) position instead.
> 
> Can anybody give me a hint?  - I hope I'm clear enough…
> 
> Thanks and greetings,
> 
> Wolf
> 

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[Gnuplot-info] Plot questions

[joachim h. <jh...@jo...>]

Hello -

I'm new in gnuplot. I wrote a script which reads single lines with the  
"every" option. This works well, but I have two questions:
1) I'd love to have the value which is written in column 1 (which is a  
time in my case) as the legend (key). Is this possible?
2) I have several xy-pairs in a line. I plot them with
	"myfile.txt" every ::1::1 using 3:2 with imp,\
	"" every ::1::1 using 6:5 with imp notitle,\
	"" every ::1::1 using 9:8 with imp notitle,\
and so on. Can I change the colors in a way that the first xy-pair  
(using 3:2 in the example above) is in red colour, and then the color  
circle is crossed so that the last value is blue? (There are different  
numbers of pairs; sometimes 6 or 12 or whatever. In each case the  
first xy-value should be red and the last blue.)

Thanks for any help. Best regards -

	joachim