rainbow.m

数学实验课程相关的工具讲稿

function rainbow()
%RAINBOW Draw a rainbow in a Matlab figure.
%  This function is an example to show how one can use the PCOLOR
%  function to obtain a plot that looks like a rainbow.

% Jordan Rosenthal, 17-May-2000
% [e-mail]

N = 64;
r = linspace(0.7,1,N);             %从0.7到1均匀取64个点生成一个线性矩阵
th = linspace(pi/3,2*pi/3,N);      %从pi/3到2pi/3均匀取64个点生成一个线性矩阵
[R,TH] = meshgrid(r,th);           %生成一个64*64的方阵
[X,Y] = pol2cart(TH,R);            %将TH,R作为极坐标上对应于角度和半径的值 。
                                   %       并将之转化为直角坐标x,y
pcolor(X,Y,reshape(1:N^2,N,N));    %在x,y定义的点上填充颜色。颜色的渐变由后面的矩阵来定义。
shading interp;                    %平滑
axis equal off;                    %去掉坐标