dtptrs - solve a triangular system of the form A*X = B or A**T*X = B, where A is a triangular matrix of order N stored in packed format, and B is an N-by-NRHS matrix
SUBROUTINE DTPTRS(UPLO, TRANSA, DIAG, N, NRHS, A, B, LDB, INFO) CHARACTER*1 UPLO, TRANSA, DIAG INTEGER N, NRHS, LDB, INFO DOUBLE PRECISION A(*), B(LDB,*) SUBROUTINE DTPTRS_64(UPLO, TRANSA, DIAG, N, NRHS, A, B, LDB, INFO) CHARACTER*1 UPLO, TRANSA, DIAG INTEGER*8 N, NRHS, LDB, INFO DOUBLE PRECISION A(*), B(LDB,*) F95 INTERFACE SUBROUTINE TPTRS(UPLO, TRANSA, DIAG, N, NRHS, A, B, LDB, INFO) CHARACTER(LEN=1) :: UPLO, TRANSA, DIAG INTEGER :: N, NRHS, LDB, INFO REAL(8), DIMENSION(:) :: A REAL(8), DIMENSION(:,:) :: B SUBROUTINE TPTRS_64(UPLO, TRANSA, DIAG, N, NRHS, A, B, LDB, INFO) CHARACTER(LEN=1) :: UPLO, TRANSA, DIAG INTEGER(8) :: N, NRHS, LDB, INFO REAL(8), DIMENSION(:) :: A REAL(8), DIMENSION(:,:) :: B C INTERFACE #include <sunperf.h> void dtptrs(char uplo, char transa, char diag, int n, int nrhs, double *a, double *b, int ldb, int *info); void dtptrs_64(char uplo, char transa, char diag, long n, long nrhs, double *a, double *b, long ldb, long *info);
Oracle Solaris Studio Performance Library dtptrs(3P) NAME dtptrs - solve a triangular system of the form A*X = B or A**T*X = B, where A is a triangular matrix of order N stored in packed format, and B is an N-by-NRHS matrix SYNOPSIS SUBROUTINE DTPTRS(UPLO, TRANSA, DIAG, N, NRHS, A, B, LDB, INFO) CHARACTER*1 UPLO, TRANSA, DIAG INTEGER N, NRHS, LDB, INFO DOUBLE PRECISION A(*), B(LDB,*) SUBROUTINE DTPTRS_64(UPLO, TRANSA, DIAG, N, NRHS, A, B, LDB, INFO) CHARACTER*1 UPLO, TRANSA, DIAG INTEGER*8 N, NRHS, LDB, INFO DOUBLE PRECISION A(*), B(LDB,*) F95 INTERFACE SUBROUTINE TPTRS(UPLO, TRANSA, DIAG, N, NRHS, A, B, LDB, INFO) CHARACTER(LEN=1) :: UPLO, TRANSA, DIAG INTEGER :: N, NRHS, LDB, INFO REAL(8), DIMENSION(:) :: A REAL(8), DIMENSION(:,:) :: B SUBROUTINE TPTRS_64(UPLO, TRANSA, DIAG, N, NRHS, A, B, LDB, INFO) CHARACTER(LEN=1) :: UPLO, TRANSA, DIAG INTEGER(8) :: N, NRHS, LDB, INFO REAL(8), DIMENSION(:) :: A REAL(8), DIMENSION(:,:) :: B C INTERFACE #include <sunperf.h> void dtptrs(char uplo, char transa, char diag, int n, int nrhs, double *a, double *b, int ldb, int *info); void dtptrs_64(char uplo, char transa, char diag, long n, long nrhs, double *a, double *b, long ldb, long *info); PURPOSE dtptrs solves a triangular system of the form A * X = B or A**T * X = B where A is a triangular matrix of order N stored in packed format, and B is an N-by-NRHS matrix. A check is made to verify that A is nonsin- gular. ARGUMENTS UPLO (input) = 'U': A is upper triangular; = 'L': A is lower triangular. TRANSA (input) Specifies the form of the system of equations: = 'N': A * X = B (No transpose) = 'T': A**T * X = B (Transpose) = 'C': A**H * X = B (Conjugate transpose = Transpose) DIAG (input) = 'N': A is non-unit triangular; = 'U': A is unit triangular. N (input) The order of the matrix A. N >= 0. NRHS (input) The number of right hand sides, i.e., the number of columns of the matrix B. NRHS >= 0. A (input) DOUBLE PRECISION array, dimension (N*(N+1)/2) The upper or lower triangular matrix A, packed columnwise in a linear array. The j-th column of A is stored in the array A as follows: if UPLO = 'U', A(i + (j-1)*j/2) = A(i,j) for 1<=i<=j; if UPLO = 'L', A(i + (j-1)*(2*n-j)/2) = A(i,j) for j<=i<=n. B (input/output) DOUBLE PRECISION array, dimension (LDB,NRHS) On entry, the right hand side matrix B. On exit, if INFO = 0, the solution matrix X. LDB (input) The leading dimension of the array B. LDB >= max(1,N). INFO (output) = 0: successful exit < 0: if INFO = -i, the i-th argument had an illegal value > 0: if INFO = i, the i-th diagonal element of A is zero, indicating that the matrix is singular and the solutions X have not been computed. 7 Nov 2015 dtptrs(3P)