Meshing of a surface plot?

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Matt Amador 2017-11-16

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https://ww2.mathworks.cn/matlabcentral/answers/367464-meshing-of-a-surface-plot

评论： Star Strider 2017-11-16

Hello there. I have a bit of trouble with my code. It's supposed to 3D plot with the mesh, and surface plot command the following equation: e^(x+i*y) with the intervals -1 > x >1 and -2pi > y > 2pi. I keep getting an error that the matrix dimensions must agree, but I don't know why that is occurring. Can someone help?

x = -1:.1:1;
y = -2*pi:.1:2*pi;
z = exp(x+i.*y);
[Xm, Ym] = meshgrid(x,y);
surf(x,y,z)

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Answer 1

Star Strider 2017-11-16

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https://ww2.mathworks.cn/matlabcentral/answers/367464-meshing-of-a-surface-plot#answer_291567

在 MATLAB Online 中打开

Calculate ‘z’ After defining ‘Xm’ and ‘Ym’, and use those as the arguments:

x = -1:.1:1;
y = -2*pi:.1:2*pi;
z = @(x,y) exp(x+i.*y);                     % Create Anonymous Function For Ceonvenience
[Xm, Ym] = meshgrid(x,y);
surf(x,y, abs(z(Xm,Ym)))

You didn’t define ‘i’ so both MATLAB and I believe you want the imaginary operator. The plots will not render the imaginary values, so here I used the abs function to plot the magnitude.

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Matt Amador 2017-11-16

Oh, I just remembered about the imaginary operator. Thanks for that. Also, would it be possible to have a contour plot in this as well?

Star Strider 2017-11-16

My pleasure.

You can either create a separate plot with the contour or contourf functions, or add a contour plot below the surf plot by using the surfc function. (The meshc function adds a contour plot to mesh plots.)

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