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How to use variables in a matrix?

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Yusuke Nakamura
Yusuke Nakamura 2016-4-14
编辑： Andrei Bobrov 2016-4-14
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.

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回答（2 个）

Andrei Bobrov
Andrei Bobrov 2016-4-14
编辑：Andrei Bobrov 2016-4-14
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);
Stalin Samuel
Stalin Samuel 2016-4-14
Replace line no 11 to
A = double(subs(A,h,1))

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