GnuPlot 中的 3 维图，其中颜色是我数据文件中的第四列? [英] 3-Dimensional Plot in GnuPlot where color is a fourth column in my data file?

问题描述

我有一个如下所示的数据文件:

I have a datafile that looks like this:

1   2   3   0.5
2   8   9   0.2
3   4   78  0.4
6   5   7   0.01
9   9   9   0.3
10  12  18  0.9
6   8   4   1

我想做这样的图http://2.bp.blogspot.com/-378_rAaSSVU/UzU0gnGcr9I/AAAAAAAABnU/P1GwP9RKBkM/s1600/gnuplot.png其中第 4 列是颜色.

I would like to do a graph like this http://2.bp.blogspot.com/-378_rAaSSVU/UzU0gnGcr9I/AAAAAAAABnU/P1GwP9RKBkM/s1600/gnuplot.png Where the 4th column is the color.

我尝试过 - 显然不正确，因为我没有使用第四列，但我没有在文档中找到任何内容:

I tried - obviously incorrect because I do not use the fourth column but I failed to find anything in the documentation:

set dgrid3d 30,30
set view 60,45
set hidden3d
dataFile='prova.dat'
set palette defined (0 "blue", 0.5 "white", 1 "pink")
set pm3d 
splot dataFile u 1:2:3 with pm3d

这样的事情有可能吗?

推荐答案

仅使用 pm3d 您可以使用第四列来选择独立于 z 值的颜色.与 dgrid3d 一起，这不是直接可能的，因为网格不是在颜色列上执行的.

Using only pm3d you can use a fourth column to select a color independent of the z-value. Together with dgrid3d this is not directly possible, because the gridding is not performed on the color column.

您可以使用一种解决方法:首先将网格 z 值绘制到一个文件中，然后将网格颜色值绘制到第二个文件中，最后一点您禁用 dgrid3d，合并两个临时文件即时并绘制它们的值:

You can use a workaround: First you plot the gridded z-value to one file, then the gridded color values to a second file and as last point you disable dgrid3d, merge the two temporary files on-the-fly and plot their values:

set dgrid3d 30,30
dataFile='prova.dat'

set table dataFile.'.grid'
splot dataFile u 1:2:3
unset table

set table dataFile.'.color'
splot dataFile u 1:2:4
unset table

set view 60,45
set hidden3d
set palette defined (0 "blue", 0.5 "white", 1 "pink")
set autoscale cbfix
set pm3d
unset dgrid3d
set ticslevel 0
splot sprintf('< paste %s.grid %s.color', dataFile, dataFile) u 1:2:3:7 with pm3d notitle

请注意，paste 是用于类 Unix 操作系统的命令行工具.对于 Windows 的类似解决方案，您可以例如编写一个小的 Python 脚本 paste.py(参见我对 从 gnuplot 中的 2 个文件获取比率 可能的实现).然后你必须运行wgnuplot_pipes.exe 二进制文件，splot 命令变成

Note, that paste is a command line tool for Unix-like operation systems. For a similar solution for windows, you can e.g. write a small Python script paste.py (see my answer to Get ratio from 2 files in gnuplot for a possible implementation). Then you must run the wgnuplot_pipes.exe binary file and the splot command becomes

splot sprintf('< python paste.py %s.grid %s.color', dataFile, dataFile) u 1:2:3:7 with pm3d notitle

当然，为此您必须安装 python，并且必须通过 PATH 环境变量提供 python 二进制文件.

Of course, for this you must have python installed and the python binary must be available via the PATH environment variable.

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