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How do I fix this formula to plot a 3D surface plot?

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Jason
Jason 2014-11-4
评论： Star Strider 2014-11-4
I've already tried different with and with out .* operator for the numerator and it still will not plot. The error I get is this...
Warning: Rank deficient, rank = 2, tol = 4.311227e-13.
> In Ex7study at 13
Error using surf (line 75)
Data dimensions must agree.
Error in Ex7exam6study (line 17)
surf(xx,yy,fxy)
clear;
clc;
% EXCERCISE 7 EXAM 6 STUDY GUIDE
% define the coordinates along x and y
x = -4.0:0.1:4.0;
y = -3.0:0.1:3.0;
% define the coordinates along the x-y plane
[xx,yy] = meshgrid(x,y);
% define and compute the given function along the x-y coordinates
fxy = (3.*xx.*yy)/(xx.^2+2*yy.^2);
% plot the function as a 3D mesh or surface
figure
surf(xx,yy,fxy)
shading interp

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采纳的回答

Star Strider
Star Strider 2014-11-4
You’re almost there!
You have to vectorise the division as well:
fxy = (3.*xx.*yy)./(xx.^2+2*yy.^2);
ADD DOT HERE ^
  2 个评论
Star Strider
Star Strider 2014-11-4
My pleasure!
I still miss those little details as well. I suspect we all do from time to time.

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