在gnuplot中绘制3D热图 [英] Plotting 3D heatmap in gnuplot

问题描述

我有4D数据.需要将第四列表示为颜色强度.其他三列将代表三个不同的轴.我想使用gnuplot生成3D热图.我怎样才能做到这一点?

I have a 4D data. The forth column is needed to be represented as color intensity. The other three columns will represent three different axes. I want to generate 3D heatmap using gnuplot. How can I do this?

数据样本:

0 0 0 16

0 0 1 25

0 1 0 27

0 1 1 29

1 0 0 8

1 0 1 44

1 1 0 50

1 1 1 27

推荐答案

在gnuplot中生成3D热图与生成2D热图相同，只不过您在中使用添加了另一列.换句话说，数据文件布置了一系列扫描"，相邻的扫描"以四边形连接.例如

generating a 3D heatmap in gnuplot is the same as generating a 2D heatmap except you add an additional column to using. In other words, the datafile lays out a series of "scans" and adjacent "scans" are connected with quadrilaterals. e.g.

x1 y1 z11 c11
x1 y2 z12 c12
x1 y3 z13 c13
...
x1 yN z1N c1N
                 #blank line here
x2 y1 z21 c21
x2 y2 z22 c22
...
x2 yN z2N c2N
                 #blank line here
.
.
.
                 #blank line here
xN y1 zN1 cN1
xN y2 zN2 cN2
...
xN yN zNN cNN

现在您可以使用在'pm3d上以1:2:3:4 w pm3d 绘制'datafile'来绘制图形.

Now you can plot this using splot 'datafile' u 1:2:3:4 w pm3d.

*请注意，沿着特定扫描"方向的x值不必恒定不变-刚开始时以这种方式可视化就更容易了.

*Note that the x-values along a particular "scan" don't need to be constant -- It's just easier to visualize it that way at first.

作为一个非常简单的示例，我们可以使用 ++ 特殊文件:

As a very simple example, we can use the ++ special file:

set xrange [0:2*pi]
set yrange [0:2*pi]
splot '++' using 1:2:2:(sin($1)*sin($2)) with pm3d

您可以通过以下伪代码制作相同的数据文件:

You could make the same datafile via the following pseudocode:

do iy=0, ny
   y = (2*pi/ny)*iy
   do ix=0, nx
      x = (2*pi/nx)*ix
      z = y
      write x,y,z,sin(x)*sin(y)
   enddo
   write blank space
enddo

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