Gnuplot change color of bars in histogram

Question

is it possible to change the color of bars in a Gnuplot script dynamically? I have the following script

reset
fontsize = 12
set term postscript enhanced eps         


        

Answer 1

You can mimic this behavior using the boxes style:

My test data:

zip 2
baz 2
bar -1
cat 4
foo -3

And then plotting with gnuplot:

set style line 1 lt 1 lc rgb "green"
set style line 2 lt 1 lc rgb "red"
set style fill solid
plot 'test.dat'  u (column(0)):2:(0.5):($2>0?1:2):xtic(1) w boxes lc variable
#                  #xval:ydata:boxwidth:color_index:xtic_labels