I'm using gnuplot to generate some plots with an x axis ranging from 0 to 20. Is it possible to set the color of some tics or axis numbers to a different color from the standard black?
I only found a way to change the color of the all the numbers in the x axis red with set xtics textcolor rgb "red".
What I need is to be able to change the color of the tic or number at x=0,3,6,... to red and all the others should stay black. Is this possible with gnuplot?
The color of the tic marks is set by the border color, so one can do something like this:
reset
set multiplot
set xrange [-5:5]
set xtics -5,1,0 # these tic marks will show up in black (the default border color)
set yrange [] writeback # save auto-generated y range for later
plot sin(x)
set border 0 linecolor "red" # change border color, and turn off drawing of the border
set xtics 1,1,5 textcolor "blue" # these tic marks will show up in the new border color, and we can specify the color of the labels
unset ytics # we don't want to display the y tics again
set yrange restore # use same range for y axis as before
unset key
plot NaN
unset multiplot
This solution also uses multiplot, but uses the second plot only to draw tic marks and labels whose color is different from the default black. It is important that the two plots have the same ranges and margins.
This might be cheating a bit, just create the plot twice with different xtics command on top of each other:
set xrange [0:10]
set multiplot
set size 1,1
set origin 0,0
set xtics 1 textcolor rgbcolor "green"
plot sin(x)
set size 1,1
set origin 0,0
set xtics 1, 2 textcolor rgbcolor "red"
plot sin(x)
unset multiplot
seems to work for me (gnuplot: Version 5.2 patchlevel 2 last modified 2017-11-15)
set arrow from first 1.5, graph 0 to first 1.5, graph 0.01 nohead linecolor "red". - user8153