Re: [Gnuplot-info] automatic detection of axis range during plotting

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

BBands <bbands <at> gmail.com> writes:

> 
> Ah, I take your point. For that I wrote a simple preprocessor that
> notes the high and low values of the series
> i wish to plot and creates the appropriate range, label and plot
> commands. Someone posted a solution here using a dummy plot a while
> back, but I never investigated it.
> 
> Best,
> 
>       John
> 
> On Fri, Mar 21, 2014 at 3:02 PM, Jon <devout1977 <at> gmail.com> wrote:
> > Thanks, it seems it does return some information concerning the range of the
> > plot. But I wonder how I can possibly save them as parameters to be used for
> > my purpose. It seems the plot will not know the range until it finishes
> > plotting the data, but after the data is finished plotting the label, key
> > etc have been put on the plot.


there is a bunch of gnuplot-defined variables
GPVAL_*
which contain the state of the recent plot.

a simple solution would be to make a dummy plot,
save the plot ranges, define the labels and then
do the real plot:

set terminal push
set teminal dumb
plot "filename" ...

set xrange [GPVAL_X_MIN:GPVAL_X_MAX]
set yrange [GPVAL_Y_MIN:GPVAL_Y_MAX]
set label 1 sprintf("xmin: %f",GPVAL_X_MIN) at ...
set label 2 sprintf("xmax: %f",GPVAL_X_MAX) at ...

set terminal pop
replot