ERROR: Z must be a matrix, not a scalar or vector.

f=input('enter function: ','s')
% f = 'x.^2 + sin(y)';                            % Test Function
f = str2func(['@(x,y)' f]);
[X,Y]=meshgrid(-10:1:10);
mesh(X,Y,f(X,Y));

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geometry geometry 2017-5-13

编辑：geometry geometry 2017-5-13

Thank you...

but one question:

when I enter the function log(x^2+y^2) an empty figure appears; what's the problem with this?

and when I enter log(x) the following error occurs:

X, Y, Z, and C cannot be complex.

Star Strider 2017-5-13

在 MATLAB Online 中打开

My pleasure.

You need to be certain that ‘f’ does element-wise operations. Change the str2func call to include a vectorize call:

f = str2func(['@(x,y)' vectorize(f)]);

See the documentation on the various functions to understand how they work, and the documentation on Array vs. Matrix Operations (link) to understand the reason the differences are important.

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