cplxmap issue when trying to plot z^(1/3)

Question

dustin 2014-10-4

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/157386-cplxmap-issue-when-trying-to-plot-z-1-3

评论： Caba 2017-8-10

I am trying to plot z^(1/3) using cplxmap. However, whenever I run my code, I recieve the following errors that are occuring in the function cplxmap:

Error using mesh (line 79)
Z must be a matrix, not a scalar or vector
Error in cplxmap (line 31)
mesh(x,y,m*s,blue*s);
Error in paper (line 16)
cplxmap(z, w)

The code I am running is:

clear all
close all
r = linspace(0, 1, 1000);                    % radius vector
theta = linspace(0, 2*pi, 1000);             % angle vector
z = r.*exp(1i*theta);                        % defines cplxgrid
x = real(z);                                 % real z
y = imag(z);                                 % imaginary z
w = z.^(1/3);                                % w = z^(1/3)
u = real(w);                                 % real w 
v = imag(w);                                 % imaginary w
figure(1);
cplxmap(z, w)
colormap(jet)

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chadi cream 2016-8-26

编辑：chadi cream 2016-8-26

you can

z=cplxgrid(10); w=z.^(1/3); cplxmap(z, w)

Caba 2017-8-10

You have to create a meshgrid (matrix) from the two column vectors, r and theta. Reduce the number of elements from 1000 to something more manageable, e.g. 51. Try different values in R=linspace(0,1,M), like M=21,51,101

R = linspace(0, 1, 51); % radius vector Theta = linspace(0, 2*pi, 51); % angle vector [r,theta] = meshgrid(R,Theta); % creating a meshgrid

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