gnuplot更改直方图中条形的颜色 [英] Gnuplot change color of bars in histogram

问题描述

是否可以动态更改Gnuplot脚本中的条形颜色? 我有以下脚本

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 fontsize
set output "bargraph_speedup.eps"
set style fill solid 1.00 border 0
set style histogram
set style data histogram
set xtics rotate by -45
set grid ytics linestyle 1
set xlabel "Benchmarks" font "bold"
set ylabel "Relative execution time vs. reference implementation" font "bold"
set datafile separator ","
plot 'bm_speedup.dat' using 2:xtic(1) ti "Speedup" linecolor rgb "#00FF00"

生成此图:

是否可以将零以下的条形颜色变成红色?

Is it possible to make the color of the bars which are below zero red?

谢谢，
斯文

Thanks,
Sven

推荐答案

您可以使用boxes样式模仿此行为:

You can mimic this behavior using the boxes style:

我的测试数据:

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

然后使用gnuplot进行绘图:

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

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