MATLAB: I dont get this; Unbalanced or unexpected parenthesis or bracket.; on the codes. What I did was putting’.’ next to high-lighted X,Y.

Question

for n=1:k
    T{n}=a(n)*sin(n*X.)*(exp(n*Y.)-exp(-n*Y.));
    P;
    P=P+T{n};
    surf(X,Y,T);grid
    hold on
end

Answer 1

X. is not valid MATLAB syntax. You cannot use . as part of a variable name (although it can be used in some array operations).

What do you think the period characters would do ?

Use this:

T{n} = a(n)*sin(n*X)*(exp(n*Y)-exp(-n*Y));