Description of getrf

getrf		Programmers Guide
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Category:mtl2lapack

Component type:function

Prototype

template <class LapackMatrix, class VectorInt> int getrf(LapackMatrix& a, VectorInt& ipivot) ;

Description

Computes an LU factorization of a general M-by-N matrix A using partial pivoting with row interchanges. Factorization has the form A = P*L*U.

a (IN/OUT - matrix(M,N)) On entry, the coefficient matrix A to be factored. On exit, the factors L and U from the factorization A = P*L*U.
ipivot (OUT - vector(min(M,N))) Integer vector. The row i of A was interchanged with row IPIV(i).
info (OUT - int) 0 : successful exit < 0 : If INFO = -i, then the i-th argument had an illegal value. > 0 : If INFO = i, then U(i,i) is exactly zero. The factorization has been completed, but the factor U is exactly singular, and division by zero will occur if it is used to solve a system of equations.

Definition

mtl2lapack.h

Preconditions

Complexity

Example

Notes

See also