dtrtri - compute the inverse of a real upper or lower triangular matrix A
SUBROUTINE DTRTRI(UPLO, DIAG, N, A, LDA, INFO) CHARACTER*1 UPLO, DIAG INTEGER N, LDA, INFO DOUBLE PRECISION A(LDA,*) SUBROUTINE DTRTRI_64(UPLO, DIAG, N, A, LDA, INFO) CHARACTER*1 UPLO, DIAG INTEGER*8 N, LDA, INFO DOUBLE PRECISION A(LDA,*) F95 INTERFACE SUBROUTINE TRTRI(UPLO, DIAG, N, A, LDA, INFO) CHARACTER(LEN=1) :: UPLO, DIAG INTEGER :: N, LDA, INFO REAL(8), DIMENSION(:,:) :: A SUBROUTINE TRTRI_64(UPLO, DIAG, N, A, LDA, INFO) CHARACTER(LEN=1) :: UPLO, DIAG INTEGER(8) :: N, LDA, INFO REAL(8), DIMENSION(:,:) :: A C INTERFACE #include <sunperf.h> void dtrtri(char uplo, char diag, int n, double *a, int lda, int *info); void dtrtri_64(char uplo, char diag, long n, double *a, long lda, long *info);
Oracle Solaris Studio Performance Library dtrtri(3P) NAME dtrtri - compute the inverse of a real upper or lower triangular matrix A SYNOPSIS SUBROUTINE DTRTRI(UPLO, DIAG, N, A, LDA, INFO) CHARACTER*1 UPLO, DIAG INTEGER N, LDA, INFO DOUBLE PRECISION A(LDA,*) SUBROUTINE DTRTRI_64(UPLO, DIAG, N, A, LDA, INFO) CHARACTER*1 UPLO, DIAG INTEGER*8 N, LDA, INFO DOUBLE PRECISION A(LDA,*) F95 INTERFACE SUBROUTINE TRTRI(UPLO, DIAG, N, A, LDA, INFO) CHARACTER(LEN=1) :: UPLO, DIAG INTEGER :: N, LDA, INFO REAL(8), DIMENSION(:,:) :: A SUBROUTINE TRTRI_64(UPLO, DIAG, N, A, LDA, INFO) CHARACTER(LEN=1) :: UPLO, DIAG INTEGER(8) :: N, LDA, INFO REAL(8), DIMENSION(:,:) :: A C INTERFACE #include <sunperf.h> void dtrtri(char uplo, char diag, int n, double *a, int lda, int *info); void dtrtri_64(char uplo, char diag, long n, double *a, long lda, long *info); PURPOSE dtrtri computes the inverse of a real upper or lower triangular matrix A. This is the Level 3 BLAS version of the algorithm. ARGUMENTS UPLO (input) = 'U': A is upper triangular; = 'L': A is lower triangular. DIAG (input) = 'N': A is non-unit triangular; = 'U': A is unit triangular. N (input) The order of the matrix A. N >= 0. A (input/output) On entry, the triangular matrix A. If UPLO = 'U', the lead- ing N-by-N upper triangular part of the array A contains the upper triangular matrix, and the strictly lower triangular part of A is not referenced. If UPLO = 'L', the leading N- by-N lower triangular part of the array A contains the lower triangular matrix, and the strictly upper triangular part of A is not referenced. If DIAG = 'U', the diagonal elements of A are also not referenced and are assumed to be 1. On exit, the (triangular) inverse of the original matrix, in the same storage format. LDA (input) The leading dimension of the array A. LDA >= max(1,N). INFO (output) = 0: successful exit < 0: if INFO = -i, the i-th argument had an illegal value > 0: if INFO = i, A(i,i) is exactly zero. The triangular matrix is singular and its inverse can not be computed. 7 Nov 2015 dtrtri(3P)