dtrtri
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,*)
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
#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);
dtrtri computes the inverse of a real upper or lower triangular
matrix A.
This is the Level 3 BLAS version of the algorithm.
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* UPLO (input)
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* DIAG (input)
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* N (input)
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The order of the matrix A. N >= 0.
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* A (input/output)
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On entry, the triangular matrix A. If UPLO = 'U', the
leading 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.
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* LDA (input)
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The leading dimension of the array A. LDA >= max(1,N).
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* INFO (output)
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