Gnuplot: arrow on logscale plot

Question

Take the following MWE for instance:

set logscale xy
set arrow 1 from 1, graph 0 to 1, graph 1
set arrow 2 from graph 0,1e+02 to graph 1,1e+02
p [x=0.001:100] (10**x)**(.111111) t ''

Arrow 1 will show up just fine but arrow 2 does not. I've also tried

set arrow 2 from graph 0,100 to graph 1,100

and, in case there was some log scaling issue,

set arrow 2 from graph 0,2 to graph 1,2.

Arrow 2 is still MIA. Any suggestions?

Christoph Christoph · Accepted Answer · 2016-11-21T16:37:03

The coordinate type (here: graph) which you specified for the x-coordinate of an arrow point is also used for y-coordinate:

1, graph 0 is equivalent to first 1, graph 0
but graph 0,100 is equivalent to graph 0, graph 100.

That means, that your second arrow is completely outside of the plotting window.

set logscale xy
set arrow 1 from 1, graph 0 to 1, graph 1
set arrow 2 from graph 0, first 1e+02 to graph 1, first 1e+02
p [x=0.001:100] (10**x)**(.111111) t ''

Gnuplot: arrow on logscale plot

1 Answers