Thread Subject: solution or not solution with solve?

Hi,

I have a problem with solve, det and sub in matlab symbolic.

I'm trying to solve : det(K) = 0 .
K depends on 'alpha', symbolic unknowns.

Theory predicts six solutions, and I found them.

But when I try to check the results using subs(det(K),'solutions',solutions), 4 solutions give effectively det(K) = 0, while the others don't nullify the determinant.

I'm very annoyed by this.

Dou you have any idea about the origines of this and where is the bug?

Thanks a lot!

Sig Ponge wrote:

> Theory predicts six solutions, and I found them.
>
> But when I try to check the results using subs(det(K),'solutions',solutions), 4 solutions give effectively det(K) = 0, while the others don't nullify the determinant.
>
> I'm very annoyed by this.

 Please provide enough information to reproduce the observation. The
easiest way of doing that is usually to give complete working input.


Christopher