[英]3D Plot in Matlab
I am trying to draw the figure of a 3D polar plot by converting it from polar to cartesian coordinates and using surf()
to plot it. 我试图通过将3D极坐标图从极坐标转换为笛卡尔坐标并使用
surf()
进行绘制来绘制该图。
Problem: I get the error ??? CData must be an M-by-N matrix or M-by-N-by-3 array
问题:我得到了错误
??? CData must be an M-by-N matrix or M-by-N-by-3 array
??? CData must be an M-by-N matrix or M-by-N-by-3 array
. ??? CData must be an M-by-N matrix or M-by-N-by-3 array
。 Where did I go wrong? 我哪里做错了? I am quite new to MATLAB and do not understand what is happening.
我对MATLAB很陌生,不了解发生了什么。
MATLAB Code MATLAB代码
clear all; 清除所有 close all;
关闭所有;
N=50;
%define matrices for ploting
x=zeros(N,N,N);
y=zeros(N,N,N);
z=zeros(N,N,N);
f=zeros(N,N,N);
%define basic input variables
r=linspace(0,2,N);
theta=linspace(0,pi,N);
phi=linspace(0,2.*pi,N);
for ii=(1:N) %use ii, jj to avoid confusion with the imaginary units
for jj=(1:N)
for kk=(1:N)
x(ii,jj,kk)=r(ii).*sin(theta(jj)).*cos(phi(kk)); %%not using
%%for loop probably can work too, test later
y(ii,jj,kk)=r(ii).*sin(theta(jj)).*sin(phi(kk));
z(ii,jj,kk)=r(ii).*cos(theta(jj));
f(ii,jj,kk)=r(ii).*exp(-r(ii)).*cos(theta(jj));
end
end
end
figure;
surf(x,y,z,f);
colormap([1,1,1]);
surf
plots a surface: so each (x,y) point has a height, z. surf
绘制一个表面:因此,每个(x,y)点都有一个高度z。
Eg 例如
N=50;
[X Y] = meshgrid(linspace(0,2,N));
Z = zeros(size(X));
for ii=(1:N)
for jj=(1:N)
x = X(ii,jj);
y = Y(ii,jj);
[theta, r] = cart2pol(x,y);
Z(ii,jj) =r * exp(-r) * cos(theta);
end
end
figure;
surf(X,Y,Z);
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