How to adjust xrange to min and max of the points actually plotted in gnuplot?

Question

Normally the xrange and yrange are adjusted to fit the largest and smallest value in the datafile, when plotting according to

plot "my_file.dat" u 1:2

Suppose I want to apply a cutoff to the y-values, so that I only include the points whose y-value is larger than, say 1. If I do

plot "my_file.dat" u 1:($2>1?$2:NaN)

I indeed select only those points. The problem, however, is that the xrange is still adjusted to the range of column 1 of the entire datafile, rather than to only those points which are actually plotted. How can I fix this? My gnuplot version is 5.2.

Answer 1

You also have to filter the undesired x-values in a similar way:

plot 'my_file.dat' u ($2 > 1 ? $1 : NaN):($2 > 1 ? $2: NaN)

If you want to draw a line between these points, a different way of filtering is necessary: see Plotting lines with missing datapoints for multidimensional data