Surface plot problem,

Question

james 2012-3-14

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/32286-surface-plot-problem

评论： Matlabuser 2014-11-14

采纳的回答： Kevin Holst

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I'm trying to create a surface plot for an equation,

the code returns the error ??? Error using ==> contourc Contour data must have 2 dimensions

Error in ==> contours at 57 CS=contourc(varargin{numarg_for_call});

Error in ==> contour3 at 87 [c,msg] = contours(args{1:nin});

Error in ==> surfc at 62 [cc,hh] = contour3(cax,x,y,z); %#ok

Error in ==> Untitled4 at 6 surfc(X,Y,Z,C);

Warning: size(CData) must equal size(ZData) or size(ZData)-1 for flat shading

my code is

x = -1:1:1; 
y = -1:1:1;
z = -1:1:1;
[X,Y,Z] = meshgrid(x,y,z);
C = (1.10471.*((Z).^2) .* ((X).^2))+(0.0481.*(Y.*Z)*14.*X);
surfc(X,Y,Z,C);
axis([-1 1 -1 1 -1 1]);

Any help would be really appreciated!

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Answer 1

Kevin Holst 2012-3-14

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https://ww2.mathworks.cn/matlabcentral/answers/32286-surface-plot-problem#answer_40801

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You're not feeding the proper inputs into surfc. surfc(x,y,z,c) requires x be a vector of length(n), y a vector of length(m), size(z) = [m,n], and size(c) = size(z). See if this suits your needs:

x = -1:1:1; 
y = -1:1:1;
[X,Y] = meshgrid(x,y);
Z = meshgrid(-1:1:1);
C = (1.10471.*((Z).^2) .* ((X).^2))+(0.0481.*(Y.*Z)*14.*X);
surfc(X,Y,Z,C);
axis([-1 1 -1 1 -1 1]);

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Kevin Holst 2012-3-15

you'll notice that I actually input a 2d matrix in the code and mentioned a vector in my description. Matrices X and Y can be 2d, Z and C must be 2d, and nothing can be 3d.

Matlabuser 2014-11-14