dla_gerpvgrw - compute the reciprocal pivot growth factor using the "max absolute element" norm
DOUBLE PRECISION FUNCTION DLA_GERPVGRW(N, NCOLS, A, LDA, AF, LDAF) INTEGER N, NCOLS, LDA, LDAF DOUBLE PRECISION A(LDA,*), AF(LDAF,*) DOUBLE PRECISION FUNCTION DLA_GERPVGRW_64(N, NCOLS, A, LDA, AF, LDAF) INTEGER*8 N, NCOLS, LDA, LDAF DOUBLE PRECISION A(LDA,*), AF(LDAF,*) F95 INTERFACE REAL(8) FUNCTION LA_GERPVGRW(N, NCOLS, A, LDA, AF, LDAF) INTEGER :: N, NCOLS, LDA, LDAF REAL(8), DIMENSION(:,:) :: A, AF REAL(8) FUNCTION LA_GERPVGRW_64(N, NCOLS, A, LDA, AF, LDAF) INTEGER(8) :: N, NCOLS, LDA, LDAF REAL(8), DIMENSION(:,:) :: A, AF C INTERFACE #include <sunperf.h> double dla_gerpvgrw (int n, int ncols, double *a, int lda, double *af, int ldaf); double dla_gerpvgrw_64 (long n, long ncols, double *a, long lda, double * af, long ldaf);
Oracle Solaris Studio Performance Library dla_gerpvgrw(3P) NAME dla_gerpvgrw - compute the reciprocal pivot growth factor using the "max absolute element" norm SYNOPSIS DOUBLE PRECISION FUNCTION DLA_GERPVGRW(N, NCOLS, A, LDA, AF, LDAF) INTEGER N, NCOLS, LDA, LDAF DOUBLE PRECISION A(LDA,*), AF(LDAF,*) DOUBLE PRECISION FUNCTION DLA_GERPVGRW_64(N, NCOLS, A, LDA, AF, LDAF) INTEGER*8 N, NCOLS, LDA, LDAF DOUBLE PRECISION A(LDA,*), AF(LDAF,*) F95 INTERFACE REAL(8) FUNCTION LA_GERPVGRW(N, NCOLS, A, LDA, AF, LDAF) INTEGER :: N, NCOLS, LDA, LDAF REAL(8), DIMENSION(:,:) :: A, AF REAL(8) FUNCTION LA_GERPVGRW_64(N, NCOLS, A, LDA, AF, LDAF) INTEGER(8) :: N, NCOLS, LDA, LDAF REAL(8), DIMENSION(:,:) :: A, AF C INTERFACE #include <sunperf.h> double dla_gerpvgrw (int n, int ncols, double *a, int lda, double *af, int ldaf); double dla_gerpvgrw_64 (long n, long ncols, double *a, long lda, double * af, long ldaf); PURPOSE dla_gerpvgrw computes the reciprocal pivot growth factor norm(A)/norm(U). The "max absolute element" norm is used. If this is much less than 1, the stability of the LU factorization of the (equili- brated) matrix A could be poor. This also means that the solution X, estimated condition numbers, and error bounds could be unreliable. ARGUMENTS N (input) N is INTEGER The number of linear equations, i.e., the order of the matrix A. N >= 0. NCOLS (input) NCOLS is INTEGER The number of columns of the matrix A. NCOLS >= 0. A (input) A is DOUBLE PRECISION array, dimension (LDA,N) On entry, the N-by-N matrix A. LDA (input) LDA is INTEGER The leading dimension of the array A. LDA >= max(1,N). AF (input) AF is DOUBLE PRECISION array, dimension (LDAF,N) The factors L and U from the factorization A=P*L*U as com- puted by DGETRF. LDAF (input) LDAF is INTEGER The leading dimension of the array AF. LDAF >= max(1,N). 7 Nov 2015 dla_gerpvgrw(3P)