how to change the color of an arrow

Question

It seems that this command can not change the color of an arrow

set arrow from 22,1590 to 523,1090 lw 3   back  lc rgb "blue" filled

But I get

duplicated arguments in style specification

and it points to the beginning of filled.

Why?

Answer 1

Usually the order of arguments doesn't matter in gnuplot, unfortunately in your case it does. Use

set arrow from 22,1590 to 523,1090 filled back lw 3 lc rgb "blue"