gnuplot-bugs

[Gnuplot-bugs] symbol points of curve

[LYVET Jean-F. <jea...@ce...>]

 

                                                      Hello,

 

           We presently use gnuplot software version 4.2 on a scientific thermohydraulic code and we have a

           problem when we use symbol at each point of the curve; the data has 500 points, then there are too

           many symbols for the troubled curve (we have used small symbols with pointsize command).

           Is it possible to ask to gnuplot to put only, for example, 20 symbols spread along the curve,

           and keep a curve  following the 500 data points

           

            We hope that the report of problem is good enough and we thank you in advance for your response.

 

             J-F Lyvet

             DEN/DER/SSTH/LDAS

             Commissariat à l'énergie atomique de Grenoble (France)

 

Re: [Gnuplot-bugs] symbol points of curve

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

LYVET Jean-François wrote:

> problem when we use symbol at each point of the curve; the data has
> 500 points, then there are too many symbols for the troubled curve
> (we have used small symbols with pointsize command). Is it possible
> to ask to gnuplot to put only, for example, 20 symbols spread along
> the curve, and keep a curve  following the 500 data points

It's possible, but not terribly straightforward.  You have to plot your 
data twice.  Once 'with points every 25', then again 'with lines'.  You 
may even have to add an invisible pseudo-dataset 'with linespoints' to 
get the right key entry.

Re: [Gnuplot-bugs] symbol points of curve

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

you just plot twice:

plot 'file.data' with lines, '' every 25 with points

to get the same color for lines and points:

plot 'file.data' with lines linetype 1, '' every 25 with points linetype 1

to get only one key with line and point (the last of the three curves
is the 'invisible pseudo-dataset' Hans-Bernhard Bröker-2 mentioned
in his email):

plot 'file.data' notitle with lines linetype 1, '' every 25 notitle with
points linetype 1 pointtype 2, 0/0 title 'description' with linespoints
linetype 1 pointtype 2

the same but shorter:

plot 'file.data' not w l lt 1, '' ev 25 not w p lt 1 pt 2, 0/0 t
'description' w lp lt 1 pt 2

> We presently use gnuplot software version 4.2 on
> a scientific thermohydraulic code and we have a
> problem when we use symbol at each point of the
> curve; the data has 500 points, then there are too
> many symbols for the troubled curve (we have used
> small symbols with pointsize command).
> Is it possible to ask to gnuplot to put only, for example,
> 20 symbols spread along the curve,
> and keep a curve  following the 500 data points.
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