Color bars in different colors for some specific values in Gnuplot

Question

I\'m using Gnuplot to generate a histogram but I need to color some of them in another color if the value are over/under a specific value. Eg if value < 10, color the spe

Answer 1

You can use the following gnuplot script:

set style fill transparent solid 0.5 noborder
set boxwidth 0.95 relative
set palette model RGB defined (0 "green", 1 "yellow", 2 "red")
plot 'path\to\your\file' using 1:2:($2<=10 ? 0 : $2<=20 ? 1 : 2) with boxes palette

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The contents of my test file are

1 4
2 15
3 40

and the outcome I get is

Answer 2

Given this datafile:

1 4  green
2 15 yellow
3 40 red

The following line works:

plot for [color in "green red yellow"] 'test.dat' using 1:(strcol(3) eq color ? $2:NaN):(0.95) with boxes lc rgb color