sstsv - compute the solution to a system of linear equations A * X = B where A is a symmetric tridiagonal matrix
SUBROUTINE SSTSV(N, NRHS, L, D, SUBL, B, LDB, IPIV, INFO) INTEGER N, NRHS, LDB, INFO INTEGER IPIV(*) REAL L(*), D(*), SUBL(*), B(LDB,*) SUBROUTINE SSTSV_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 STSV(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 STSV_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 sstsv(int n, int nrhs, float *l, float *d, float *subl, float *b, int ldb, int *ipiv, int *info); void sstsv_64(long n, long nrhs, float *l, float *d, float *subl, float *b, long ldb, long *ipiv, long *info);
Oracle Solaris Studio Performance Library sstsv(3P) NAME sstsv - compute the solution to a system of linear equations A * X = B where A is a symmetric tridiagonal matrix SYNOPSIS SUBROUTINE SSTSV(N, NRHS, L, D, SUBL, B, LDB, IPIV, INFO) INTEGER N, NRHS, LDB, INFO INTEGER IPIV(*) REAL L(*), D(*), SUBL(*), B(LDB,*) SUBROUTINE SSTSV_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 STSV(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 STSV_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 sstsv(int n, int nrhs, float *l, float *d, float *subl, float *b, int ldb, int *ipiv, int *info); void sstsv_64(long n, long nrhs, float *l, float *d, float *subl, float *b, long ldb, long *ipiv, long *info); PURPOSE sstsv computes the solution to a system of linear equations A * X = B where A is a symmetric tridiagonal matrix. ARGUMENTS N (input) INTEGER The order of the matrix A. N >= 0. NRHS (input) The number of right hand sides in B. L (input/output) REAL array, dimension (N-1) On entry, the n-1 subdiagonal elements of the tridiagonal matrix A. On exit, part of the factorization of A. D (input/output) REAL array, dimension (N) On entry, the n diagonal elements of the tridiagonal matrix A. On exit, the n diagonal elements of the diagonal matrix D from the factorization of A. SUBL (output) REAL array, dimension (N-2) On exit, part of the factorization of A. B (input/output) The columns of B contain the right hand sides. LDB (input) The leading dimension of B as specified in a type or DIMEN- SION statement. IPIV (output) INTEGER array, dimension (N) On exit, the pivot indices of the factorization. INFO (output) INTEGER = 0: successful exit < 0: if INFO = -i, the i-th argument had an illegal value > 0: if INFO = i, D(k,k) is exactly zero. The factorization has been completed, but the block diagonal matrix D is exactly singular and division by zero will occur if it is used to solve a system of equations. 7 Nov 2015 sstsv(3P)