gnuplot-info

[Gnuplot-info] Autoscaling when plotting data and functions

[Paul W. <pau...@gm...>]

Hello Gnuplotters,

I want to plot a data file and a function.  My problem is that I want to
autoscale the axes, but just on the data in the file, i.e. the yrange should
not be scaled to the yrange the function requires for the given xrange, but
yrange and xrange should be solely determined by the data, and those parts
of the function off these ranges should be clipped.  I tried the yrange
writeback-plot data-yrange restore-replot function approach, but that
doesn't work nicely with terminal PNG.

Thanks for any advise,

Paul

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Re: [Gnuplot-info] Autoscaling when plotting data and functions

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

Paul Wagner <paul_spam <at> gmx.at> writes:

> 
> 
> Hello Gnuplotters,
> 
> I want to plot a data file and a function.  My problem is that I want to
> autoscale the axes, but just on the data in the file, i.e. the yrange should
> not be scaled to the yrange the function requires for the given xrange, but
> yrange and xrange should be solely determined by the data, and those parts
> of the function off these ranges should be clipped.  I tried the yrange
> writeback-plot data-yrange restore-replot function approach, but that
> doesn't work nicely with terminal PNG.
> 
> Thanks for any advise,
> 
> Paul
> 

you could switch to another terminal for the first plot:

set output
set terminal dumb
set yrange [] writeback
plot 'datafilename' ...
set yrange restore
set terminal png
set output 'filename.png'
replot function(x) ...
set output

Re: [Gnuplot-info] Autoscaling when plotting data and functions

[Paul W. <pau...@gm...>]

> you could switch to another terminal for the first plot:

Thought about that, unfortunately all that happens somewhere within a
multiplot, so I can't switch the output, nor the terminal.

Paul

Re: [Gnuplot-info] Autoscaling when plotting data and functions

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

Paul Wagner <paul_spam <at> gmx.at> writes:

> 
> > you could switch to another terminal for the first plot:
> 
> Thought about that, unfortunately all that happens somewhere within a
> multiplot, so I can't switch the output, nor the terminal.
> 
> Paul
> 
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with an actual version of gnuplot you have access to internal
variables like
GPVAL_X_MIN
GPVAL_X_MAX
GPVAL_Y_MIN
GPVAL_Y_MAX
...
(see 'show variables all')

you could do all the dummy plots before starting the multiplot
environment and store the x/y-ranges in local variables and
use these to set the x/y-ranges explicitly for each plot
later.

Re: [Gnuplot-info] Autoscaling when plotting data and functions

[Paul W. <pau...@gm...>]

> with an actual version of gnuplot you have access to internal
> variables like
> GPVAL_X_MIN
> GPVAL_X_MAX
> GPVAL_Y_MIN
> GPVAL_Y_MAX
> ...
> (see 'show variables all')
> 
> you could do all the dummy plots before starting the multiplot
> environment and store the x/y-ranges in local variables and
> use these to set the x/y-ranges explicitly for each plot
> later.

Thanks, works perfectly!