使用什么绘图软件：具有唯一数据的2D极坐标图 [英] What plotting software to use: 2D polar plot with unique data

问题描述

我有以下格式的数据（示例）：

  R_min R_maxθ_minθ_min区域
 
 0 260 0 1.57 114 
 260 270 0 1.57 106 
 270 320 0 1.57 107 
  

$ b b

可以看到，我有从R_min到R_max创建的从theta_min到theta_max的区域（区域）。每行数据代表一个区域，我想根据区域号用相应的颜色绘制。在这个简单的情况下，上面显示的数据如下图所示：

我应该使用什么绘图软件来完成这项工作？选项：

• MATLAB。我无法找到我需要的，但发现的功能，如。




• 在Unix系统上，排序也可以使用eg来实现

    plot'< sort -r test.txt'... 
    

I have my (example) data in the following format:

R_min  R_max   θ_min   θ_min   Zones

0   260 0   1.57    114
260 270 0   1.57    106
270 320 0   1.57    107

As you can see, I have "zones" (areas) that are created from R_min to R_max that sweep from theta_min to theta_max. Each row of data represents an area that I want to plot with a corresponding color based on the zone number. In this simple case, the data I show above would look like the following picture:

What plotting software should I use to accomplish this? I have been investigating the following options:

• MATLAB. I am having trouble finding exactly what I need, but have found features like http://www.mathworks.com/help/symbolic/mupad_ref/plot-density.html?searchHighlight=plot%3A%3Adensity

• Gnuplot. My issue with Gnuplot is the lack of documentation.

Are there other programs or a better way to compile my data to make my task-at-hand doable?

My real data set has thousands of rows of data and not nearly as simple as a quarter circle rainbow.

解决方案

Here is one possible solution with gnuplot. That uses the circles plotting style to draw the overlapping wedges at the origin with a specified radius. That requires you to have your data sorted by descending maximum radius, and that you have no gaps.

Here is a possible script:

set xrange [0:350]
set yrange [0:350]

set size ratio -1
set style fill solid noborder
set palette defined (106 'blue', 107 'yellow', 114 'magenta')
set cbrange [106:114]
unset colorbox
plot 'test.txt' using (0):(0):2:($3*180/pi):($4*180/pi):5 with circles linecolor palette notitle

with the result (with 4.6.4):

Some more remarks:

• The radius of the circles is given in units of the x-axis, but the y-axis isn't adapted accordingly. That's why you must set both xrange, yrange and even the ratio of the two axes with set size ratio -1.

• Using the palette for coloring is one option, other options like using linecolor variable or linecolor rgb variable, are explained e.g. in gnuplot candlestick red and green fill.

• On Unix systems, the sorting could also be done on-the-fly with e.g.

  plot '< sort -r test.txt' ...
  

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