SRC/sgetrf.f(3)            Library Functions Manual            SRC/sgetrf.f(3)

NAME
       SRC/sgetrf.f

SYNOPSIS
   Functions/Subroutines
       subroutine sgetrf (m, n, a, lda, ipiv, info)
           SGETRF

Function/Subroutine Documentation
   subroutine sgetrf (integer m, integer n, real, dimension( lda, * ) a,
       integer lda, integer, dimension( * ) ipiv, integer info)
       SGETRF

       Purpose:


           !>
           !> SGETRF computes an LU factorization of a general M-by-N matrix A
           !> using partial pivoting with row interchanges.
           !>
           !> The factorization has the form
           !>    A = P * L * U
           !> where P is a permutation matrix, L is lower triangular with unit
           !> diagonal elements (lower trapezoidal if m > n), and U is upper
           !> triangular (upper trapezoidal if m < n).
           !>
           !> This is the right-looking Level 3 BLAS version of the algorithm.
           !>

       Parameters
           M

           !>          M is INTEGER
           !>          The number of rows of the matrix A.  M >= 0.
           !>

           N

           !>          N is INTEGER
           !>          The number of columns of the matrix A.  N >= 0.
           !>

           A

           !>          A is REAL array, dimension (LDA,N)
           !>          On entry, the M-by-N matrix to be factored.
           !>          On exit, the factors L and U from the factorization
           !>          A = P*L*U; the unit diagonal elements of L are not stored.
           !>

           LDA

           !>          LDA is INTEGER
           !>          The leading dimension of the array A.  LDA >= max(1,M).
           !>

           IPIV

           !>          IPIV is INTEGER array, dimension (min(M,N))
           !>          The pivot indices; for 1 <= i <= min(M,N), row i of the
           !>          matrix was interchanged with row IPIV(i).
           !>

           INFO

           !>          INFO is INTEGER
           !>          = 0:  successful exit
           !>          < 0:  if INFO = -i, the i-th argument had an illegal value
           !>          > 0:  if INFO = i, 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.
           !>

       Author
           Univ. of Tennessee


           Univ. of California Berkeley


           Univ. of Colorado Denver


           NAG Ltd.

       Definition at line 107 of file sgetrf.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

LAPACK                          Version 3.12.0                 SRC/sgetrf.f(3)