Colormap on polarhistogram bars

Question

MichailM 2019-2-11

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/444350-colormap-on-polarhistogram-bars

回答： Alok Nimrani 2019-2-19

Hi,

Is there any way to include a colormap on the polarhistogram bars? For example, based on the code below

close all;
clear all;
clc;
% Random theta values between 0 and 2*pi
a = 0;
b = 2*pi;
theta = (b-a).*rand(1000,1) + a;
% Random values between -100 and 100
c = -100;
d = 100;
val = (d-c).*rand(1000,1) + c;
data = [theta val];
% Plotting
f1 = figure(1);
p(1) = polarhistogram(data(:,1),...
       'BinEdges',[deg2rad(0):deg2rad(15):deg2rad(360)],...
       'Normalization','probability','FaceAlpha',1);
   
ax = gca;
ax.ThetaZeroLocation = 'top';
ax.ThetaDir = 'clockwise';

The polarhistogram is generaetd based on the values of the data(:,1) column. It would be useful to have a colormap based on the corresponding values of data(:,2).

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Answer 1

Alok Nimrani 2019-2-19

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/444350-colormap-on-polarhistogram-bars#answer_361676

Hi Michail,

You can define a colormap using hsv function and then choose a line color according to the values of data(:,2). You can have a look at the following ML Answers post which describes an approach to achieve this: https://www.mathworks.com/matlabcentral/answers/91170-define-colormap-according-to-certain-variable

Hope this helps.