sgetrf - N matrix A using partial pivoting with row interchanges
SUBROUTINE SGETRF(M, N, A, LDA, IPIVOT, INFO) INTEGER M, N, LDA, INFO INTEGER IPIVOT(*) REAL A(LDA,*) SUBROUTINE SGETRF_64(M, N, A, LDA, IPIVOT, INFO) INTEGER*8 M, N, LDA, INFO INTEGER*8 IPIVOT(*) REAL A(LDA,*) F95 INTERFACE SUBROUTINE GETRF(M, N, A, LDA, IPIVOT, INFO) INTEGER :: M, N, LDA, INFO INTEGER, DIMENSION(:) :: IPIVOT REAL, DIMENSION(:,:) :: A SUBROUTINE GETRF_64(M, N, A, LDA, IPIVOT, INFO) INTEGER(8) :: M, N, LDA, INFO INTEGER(8), DIMENSION(:) :: IPIVOT REAL, DIMENSION(:,:) :: A C INTERFACE #include <sunperf.h> void sgetrf(int m, int n, float *a, int lda, int *ipivot, int *info); void sgetrf_64(long m, long n, float *a, long lda, long *ipivot, long *info);
Oracle Solaris Studio Performance Library sgetrf(3P) NAME sgetrf - compute an LU factorization of a general M-by-N matrix A using partial pivoting with row interchanges SYNOPSIS SUBROUTINE SGETRF(M, N, A, LDA, IPIVOT, INFO) INTEGER M, N, LDA, INFO INTEGER IPIVOT(*) REAL A(LDA,*) SUBROUTINE SGETRF_64(M, N, A, LDA, IPIVOT, INFO) INTEGER*8 M, N, LDA, INFO INTEGER*8 IPIVOT(*) REAL A(LDA,*) F95 INTERFACE SUBROUTINE GETRF(M, N, A, LDA, IPIVOT, INFO) INTEGER :: M, N, LDA, INFO INTEGER, DIMENSION(:) :: IPIVOT REAL, DIMENSION(:,:) :: A SUBROUTINE GETRF_64(M, N, A, LDA, IPIVOT, INFO) INTEGER(8) :: M, N, LDA, INFO INTEGER(8), DIMENSION(:) :: IPIVOT REAL, DIMENSION(:,:) :: A C INTERFACE #include <sunperf.h> void sgetrf(int m, int n, float *a, int lda, int *ipivot, int *info); void sgetrf_64(long m, long n, float *a, long lda, long *ipivot, long *info); 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 diago- nal 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. ARGUMENTS M (input) The number of rows of the matrix A. M >= 0. N (input) The number of columns of the matrix A. N >= 0. A (input/output) 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 (input) The leading dimension of the array A. LDA >= max(1,M). IPIVOT (output) The pivot indices; for 1 <= i <= min(M,N), row i of the matrix was interchanged with row IPIVOT(i). INFO (output) = 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. 7 Nov 2015 sgetrf(3P)