SolveLU (FUN)¶

FUNCTION SolveLU : ResultCode

Solves a system of linear equations A*X = B for X.
The matrix A is modified in-place.

We use an LU-decomposition that is computed using gaussian elimination.
See DecomposeLU.

The solver can be used to efficiently solve the same matrix A for multiple
different values of b: the LU-decomposition is computed once for A and then
used to solve for each column of B in turn.
The result is stored column-wise in X.

InOut:

Scope	Name	Type	Comment
Return	`SolveLU`	ResultCode
Inout	`X`	Matrix	The result matrix, must be a n x p matrix
	`A`	Matrix	The matrix to solve, must be a regular n x n matrix
	`B`	Matrix	The right-hand side of the equation, must be a n x p matrix
Input	`padiPCol`	POINTER TO ARRAY [0..0] OF DINT	The permutation of the columns, pointer to an array of at least n elements.
Input	`padZ`	POINTER TO ARRAY [0..0] OF LREAL	Pointer to an array with at least n elements