dtrti2 - compute the inverse of a real upper or lower triangular matrix
SUBROUTINE DTRTI2(UPLO, DIAG, N, A, LDA, INFO) CHARACTER*1 UPLO, DIAG INTEGER N, LDA, INFO DOUBLE PRECISION A(LDA,*) SUBROUTINE DTRTI2_64(UPLO, DIAG, N, A, LDA, INFO) CHARACTER*1 UPLO, DIAG INTEGER*8 N, LDA, INFO DOUBLE PRECISION A(LDA,*) F95 INTERFACE SUBROUTINE TRTI2(UPLO, DIAG, N, A, LDA, INFO) CHARACTER(LEN=1) :: UPLO, DIAG INTEGER :: N, LDA, INFO REAL(8), DIMENSION(:,:) :: A SUBROUTINE TRTI2_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 dtrti2(char uplo, char diag, int n, double *a, int lda, int *info); void dtrti2_64(char uplo, char diag, long n, double *a, long lda, long *info);
Oracle Solaris Studio Performance Library dtrti2(3P) NAME dtrti2 - compute the inverse of a real upper or lower triangular matrix SYNOPSIS SUBROUTINE DTRTI2(UPLO, DIAG, N, A, LDA, INFO) CHARACTER*1 UPLO, DIAG INTEGER N, LDA, INFO DOUBLE PRECISION A(LDA,*) SUBROUTINE DTRTI2_64(UPLO, DIAG, N, A, LDA, INFO) CHARACTER*1 UPLO, DIAG INTEGER*8 N, LDA, INFO DOUBLE PRECISION A(LDA,*) F95 INTERFACE SUBROUTINE TRTI2(UPLO, DIAG, N, A, LDA, INFO) CHARACTER(LEN=1) :: UPLO, DIAG INTEGER :: N, LDA, INFO REAL(8), DIMENSION(:,:) :: A SUBROUTINE TRTI2_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 dtrti2(char uplo, char diag, int n, double *a, int lda, int *info); void dtrti2_64(char uplo, char diag, long n, double *a, long lda, long *info); PURPOSE dtrti2 computes the inverse of a real upper or lower triangular matrix. This is the Level 2 BLAS version of the algorithm. ARGUMENTS UPLO (input) Specifies whether the matrix A is upper or lower triangular. = 'U': Upper triangular = 'L': Lower triangular DIAG (input) Specifies whether or not the matrix A is unit triangular. = 'N': Non-unit triangular = 'U': 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 = -k, the k-th argument had an illegal value 7 Nov 2015 dtrti2(3P)