'subs' not working as i want
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Hello guys,
I have this equation -x^2/2 + 2*x - (5*I)/2 and I'm trying to replace the letter x with a the matrix A and the letter I with the matrix B.
A = 0 1 0
0 0 1
2 -5 4
B = eye(3)
The problem is that when I write subs(eq, x, A) and subs(eq, I, eye(3)) I get a very big matrix, and this is not the answer.
2 个评论
YT
2018-12-8
编辑:YT
2018-12-8
It makes sense that your result will be "a very big matrix". subs(eq, x, A) will give you a 3x3 matrix because you substitute x for a 3x3 matrix. With subs(eq, I, eye(3)) you are trying to substiute an identity matrix in your previous subsituted matrix. So what do you expect the result to be then?
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