ssttrs - compute the solution to a real system of linear equations A*X = B, where A is an N-by-N symmetric tridiagonal matrix and X and B are N-by-NRHS matrices
SUBROUTINE SSTTRS(N, NRHS, L, D, SUBL, B, LDB, IPIV, INFO) INTEGER N, NRHS, LDB, INFO INTEGER IPIV(*) REAL L(*), D(*), SUBL(*), B(LDB,*) SUBROUTINE SSTTRS_64(N, NRHS, L, D, SUBL, B, LDB, IPIV, INFO) INTEGER*8 N, NRHS, LDB, INFO INTEGER*8 IPIV(*) REAL L(*), D(*), SUBL(*), B(LDB,*) F95 INTERFACE SUBROUTINE STTRS(N, NRHS, L, D, SUBL, B, LDB, IPIV, INFO) INTEGER :: N, NRHS, LDB, INFO INTEGER, DIMENSION(:) :: IPIV REAL, DIMENSION(:) :: L, D, SUBL REAL, DIMENSION(:,:) :: B SUBROUTINE STTRS_64(N, NRHS, L, D, SUBL, B, LDB, IPIV, INFO) INTEGER(8) :: N, NRHS, LDB, INFO INTEGER(8), DIMENSION(:) :: IPIV REAL, DIMENSION(:) :: L, D, SUBL REAL, DIMENSION(:,:) :: B C INTERFACE #include <sunperf.h> void ssttrs(int n, int nrhs, float *l, float *d, float *subl, float *b, int ldb, int *ipiv, int *info); void ssttrs_64(long n, long nrhs, float *l, float *d, float *subl, float *b, long ldb, long *ipiv, long *info);
Oracle Solaris Studio Performance Library ssttrs(3P) NAME ssttrs - compute the solution to a real system of linear equations A*X = B, where A is an N-by-N symmetric tridiagonal matrix and X and B are N-by-NRHS matrices SYNOPSIS SUBROUTINE SSTTRS(N, NRHS, L, D, SUBL, B, LDB, IPIV, INFO) INTEGER N, NRHS, LDB, INFO INTEGER IPIV(*) REAL L(*), D(*), SUBL(*), B(LDB,*) SUBROUTINE SSTTRS_64(N, NRHS, L, D, SUBL, B, LDB, IPIV, INFO) INTEGER*8 N, NRHS, LDB, INFO INTEGER*8 IPIV(*) REAL L(*), D(*), SUBL(*), B(LDB,*) F95 INTERFACE SUBROUTINE STTRS(N, NRHS, L, D, SUBL, B, LDB, IPIV, INFO) INTEGER :: N, NRHS, LDB, INFO INTEGER, DIMENSION(:) :: IPIV REAL, DIMENSION(:) :: L, D, SUBL REAL, DIMENSION(:,:) :: B SUBROUTINE STTRS_64(N, NRHS, L, D, SUBL, B, LDB, IPIV, INFO) INTEGER(8) :: N, NRHS, LDB, INFO INTEGER(8), DIMENSION(:) :: IPIV REAL, DIMENSION(:) :: L, D, SUBL REAL, DIMENSION(:,:) :: B C INTERFACE #include <sunperf.h> void ssttrs(int n, int nrhs, float *l, float *d, float *subl, float *b, int ldb, int *ipiv, int *info); void ssttrs_64(long n, long nrhs, float *l, float *d, float *subl, float *b, long ldb, long *ipiv, long *info); PURPOSE ssttrs computes the solution to a real system of linear equations A * X = B, where A is an N-by-N symmetric tridiagonal matrix and X and B are N-by-NRHS matrices. ARGUMENTS N (input) INTEGER The order of the matrix A. N >= 0. NRHS (input) INTEGER The number of right hand sides, i.e., the number of columns of the matrix B. NRHS >= 0. L (input) REAL array, dimension (N-1) On entry, the subdiagonal elements of L. D (input) REAL array, dimension (N) On entry, the diagonal elements of D. SUBL (input) REAL array, dimension (N-2) On entry, the second subdiagonal elements of L. B (input/output) REAL array, dimension (LDB, NRHS) On entry, the N-by-NRHS right hand side matrix B. On exit, if INFO = 0, the N-by-NRHS solution matrix X. LDB (input) INTEGER The leading dimension of the array B. LDB >= max(1, N) IPIV (input) INTEGER array, dimension (N) Details of the interchanges and block pivot. IPIV is provided by SSTTRF. If IPIV(K) > 0, 1 by 1 pivot, and if IPIV(K) = K + 1 an interchange done; If IPIV(K) < 0, 2 by 2 pivot, no interchange required. INFO (output) INTEGER = 0: successful exit < 0: if INFO = -k, the k-th argument had an illegal value 7 Nov 2015 ssttrs(3P)