MATLAB: This function is wrong written

function wrong written

My function is: funk1=3*((1-x).^2)*exp(-x.^2-(y+1).^2) and matlab send me and error but don't write where it is.

Best Answer

F = 3*((1-x).^2).*exp(-x.^2-(y+1).^2);
                ^ you need this .

Read about the difference here:

https://www.mathworks.com/help/matlab/matlab_prog/array-vs-matrix-operations.html

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MATLAB: Problem using mesh. “Matrix is singular to working precision.”

Actually, the problem is that you do matrix operation but instead, you need to do elementwise operation, which means using ./ and .* instead of / and *. Try this:

[X,Y] = meshgrid([-3:0.01:3]); 
f1=@(X,Y) (3*X.^2.*Y + 10.*X.*Y.^2)./(exp(X.^2) + 3.*Y.^4) - (2.*X.*exp(X.^2).*(X.^3.*Y + 5.*X.^2*Y.^2))./(exp(X.^2) + 3*Y.^4).^2;
mesh(X,Y,f1(X,Y));

MATLAB: How to solve this nonlinear system of 4 equations using fsolve

Your error is that inside myfun, you call fsolve with myfun as an argument. So fsolve will then call myfun, which will call fsolve, etc. This rather incestuously recursive behavior will cause fsolve to fail in frustration. It won't return anything useful either as you have written the code.

Learn to use fsolve. Do so by reading the tutorials for fsolve. READ THE HELP. There are examples of use in there.

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Related Solutions

MATLAB: Problem using mesh. “Matrix is singular to working precision.”

MATLAB: How to solve this nonlinear system of 4 equations using fsolve

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