gnuplot: max and min values in a range

Question

I\'m plotting some data with a different X range and I would like to change yrange according to the maximum and minimum value of the data in the current X range. When I use

Answer 1

Setting the yrange to GPVAL_DATA_Y_MIN:GPVAL_DATA_Y_MAX has the disadvantage of not using gnuplots autoscaling functionality which extends the ranges to the next tic.

In automatic plotting I therefore prefer the following

f(x)=sin(x)>0.5? 1:-1 #example function

set ytics 0.2
plot  1.01*f(x) # dummy plot to set GPVAL_*
set yrange [GPVAL_Y_MIN:GPVAL_Y_MAX]

plot f(x) # actual plot

This also works for data plots of course:

plot 'data.csv' u 1:(1.01*$2)
set yrange [GPVAL_Y_MIN:GPVAL_Y_MAX]
plot 'data.csv' u 1:2