ERROR: Z must be a matrix, not a scalar or vector.
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geometry geometry
on 13 May 2017
Commented: Star Strider
on 13 May 2017
What's the problem with the following code?
syms x y;
f=input('enter function: ','s');
f = symfun(eval(f), [x y]);
[X,Y]=meshgrid(-10:1:10);
mesh(f);
when i run the above code after entering a function the following error occurs:
Z must be a matrix, not a scalar or vector.
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Accepted Answer
Star Strider
on 13 May 2017
There is no reason to use the Symbolic Math Toolbox here. Core MATLAB fiunctions will work.
The Code —
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));
2 Comments
Star Strider
on 13 May 2017
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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