Solves the equation Factored * x = b for the vector of double-precision values x in place, and without any internal memory allocations.
- iOS 11+
- macOS 10.13+
- Mac Catalyst 13.0+
- tvOS 11+
- watchOS 4+
The factored matrix to solve.
On input, the vector b. On return it is overwritten with the vector x. If A has dimension m x n, then this parameter must have length k, where k = max(m,n).
If the factorization is A = QR and the system is underdetermined, the solution of minimum norm ‖ x ‖₂ is returned.
If the factorization is A = QR and the system is overdetermined, the least squares solution arg minₓ ‖ AX - B ‖₂ is returned.
In the case of a factorization of type
Sparse, the factorization is in fact of AᵀA, so the solution returned is for the system AᵀAX = B.