How to use variables in a matrix?

Hi.

I was looking for the way to use a variable inside a matrix, and found some resources which explain the method using syms and subs function. However, my matlab code gives an output in fraction for each element of the matrix. Could you please tell me how I can fix this issue? (matlab code is attached)

Thanks in advance.

Answer 1

[Andrei Bobrov]

Qc = [176.7308, 2.7786, 0;
      2.7786, 11.3413, 0;
      0, 0, 4.1991];

func1 = @(h)sum(Qc(:)*diff(h*(-2:2)),2);
A = reshape(func1(1),size(Qc));

for your case:

func1 = @(h)4*Qc*h;
A = func1(1);

Answer 2

[Stalin Samuel]

Replace line no 11 to

A = double(subs(A,h,1))