This code gives me this mistake Error using eig For standard eigen problem EIG(A), A must be square.I hope anybody help me

T=0:5; F=@(n)3.^n.*cos(T); G=0; for m=0:5; G=G+[F(m-1) F(m+1) F(m+2);F(m+3) F(m+1) F(m+2);F(m) F(m+1) F(m+2)] end q=eig(G)

[Roger Stafford]

As you have defined G, it will be a singular matrix - that is, its determinant will be zero, because its rows are clearly not linearly independent. That will lead to a lot of trouble. So your problem is fundamental.

The error message is undoubtedly due to the fact that each F entry is a 1-by-6 array which makes G be 3-by-18 and therefore not square. That I think is easily corrected, but that is not the main problem. Singularity is what you need to worry about.