[SciPy-user] Solve for symmetric matrix?

[Anand Patil]

> If the matrix has a zero eigenvalue, it has a nullspace so it's 
> singular so you can't really invert it. However, if you know in 
> advance that the RHS vector is orthogonal to the nullspace you can 
> solve for the remaining components using a low-rank submatrix.

I mean if you know in advance that the _LHS_ vector (the vector you're 
solving for) is orthogonal to the nullspace you can solve for the 
remaining components using a _full_-rank submatrix. Ehh, too much to do.