Function Reference
— Loadable Function: [x, rcond] = inv (a)
— Loadable Function: [x, rcond] = inverse (a)

Compute the inverse of the square matrix a. Return an estimate of the reciprocal condition number if requested, otherwise warn of an ill-conditioned matrix if the reciprocal condition number is small.

If called with a sparse matrix, then in general x will be a full matrix, and so if possible forming the inverse of a sparse matrix should be avoided. It is significantly more accurate and faster to do y = a \ b, rather than y = inv (a) * b.