Gnuplot，您可以使用两种不同的调色板进行崇拜吗? [英] Gnuplot, can you use two different palettes worship?

问题描述

我想要两个不同的渐变.这有可能吗 两种不同的调色板?是的，如何声明它们?

I want to have two different gradients. Is this possible with two different palettes? And yes, how to declare them?

推荐答案

我想问题是您没有设置固定的cbrange. set paletted defined语句中给出的数值是相对值.根据您先前的问题，将颜色缩放到[-1:1]范围.在这种情况下，调色板定义中的相对值和绘图中的相对值是重合的.但是，如果只有正值或只有负值，则cbrange实际上是[-1:0]或[0:1].只需使用set cbrange [-1:1]，它就可以工作.

I guess the problem is that you don't set a fixed cbrange. The numerical values given in the set paletted defined statement are relative values. According to your previous questions you scale the color to the range [-1:1]. In that case, your relative values in the palette definition and those in the plots coincide. However, if you have only positive or only negative values, then you have effectively a cbrange of [-1:0] or [0:1]. Just use a set cbrange [-1:1] and it should work.

下面的最小示例显示了您第一个未设置cbrange的情况，然后在第二个图中使用固定的cbrange进行了显示的结果:

The following minimal example shows your first what happens without setting a cbrange, and then in the second plot the result with a fixed cbrange:

文件test.txt包含值

1 5
2 3
3 2

gnuplot脚本为:

The gnuplot script is:

set boxwidth 0.8 relative
set palette defined (-1 "#D30000", 0 "#00F000", 0 "#FFF900", 1 "#FF0700")

set style data boxes
set style fill solid 1.0 noborder
unset key
unset colorbox

set multiplot layout 1,2

set title 'wrong colors'
plot for [i=51:1:-1] 'test.txt' using 1:($2*i/51.0):(i/51.0) lc palette

set title 'correct colors'
set cbrange[-1:1]
replot
unset multiplot

4.6.3的结果:

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