sptsv - compute the solution to a real system of linear equations A*X = B, where A is an N-by-N symmetric positive definite tridiagonal matrix, and X and B are N-by-NRHS matrices
SUBROUTINE SPTSV(N, NRHS, D, E, B, LDB, INFO) INTEGER N, NRHS, LDB, INFO REAL D(*), E(*), B(LDB,*) SUBROUTINE SPTSV_64(N, NRHS, D, E, B, LDB, INFO) INTEGER*8 N, NRHS, LDB, INFO REAL D(*), E(*), B(LDB,*) F95 INTERFACE SUBROUTINE PTSV(N, NRHS, D, E, B, LDB, INFO) INTEGER :: N, NRHS, LDB, INFO REAL, DIMENSION(:) :: D, E REAL, DIMENSION(:,:) :: B SUBROUTINE PTSV_64(N, NRHS, D, E, B, LDB, INFO) INTEGER(8) :: N, NRHS, LDB, INFO REAL, DIMENSION(:) :: D, E REAL, DIMENSION(:,:) :: B C INTERFACE #include <sunperf.h> void sptsv(int n, int nrhs, float *d, float *e, float *b, int ldb, int *info); void sptsv_64(long n, long nrhs, float *d, float *e, float *b, long ldb, long *info);
Oracle Solaris Studio Performance Library sptsv(3P) NAME sptsv - compute the solution to a real system of linear equations A*X = B, where A is an N-by-N symmetric positive definite tridiagonal matrix, and X and B are N-by-NRHS matrices SYNOPSIS SUBROUTINE SPTSV(N, NRHS, D, E, B, LDB, INFO) INTEGER N, NRHS, LDB, INFO REAL D(*), E(*), B(LDB,*) SUBROUTINE SPTSV_64(N, NRHS, D, E, B, LDB, INFO) INTEGER*8 N, NRHS, LDB, INFO REAL D(*), E(*), B(LDB,*) F95 INTERFACE SUBROUTINE PTSV(N, NRHS, D, E, B, LDB, INFO) INTEGER :: N, NRHS, LDB, INFO REAL, DIMENSION(:) :: D, E REAL, DIMENSION(:,:) :: B SUBROUTINE PTSV_64(N, NRHS, D, E, B, LDB, INFO) INTEGER(8) :: N, NRHS, LDB, INFO REAL, DIMENSION(:) :: D, E REAL, DIMENSION(:,:) :: B C INTERFACE #include <sunperf.h> void sptsv(int n, int nrhs, float *d, float *e, float *b, int ldb, int *info); void sptsv_64(long n, long nrhs, float *d, float *e, float *b, long ldb, long *info); PURPOSE sptsv computes the solution to a real system of linear equations A*X = B, where A is an N-by-N symmetric positive definite tridiagonal matrix, and X and B are N-by-NRHS matrices. A is factored as A = L*D*L**T, and the factored form of A is then used to solve the system of equations. ARGUMENTS 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. D (input/output) 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 A = L*D*L**T. E (input/output) On entry, the (n-1) subdiagonal elements of the tridiagonal matrix A. On exit, the (n-1) subdiagonal elements of the unit bidiagonal factor L from the L*D*L**T factorization of A. (E can also be regarded as the superdiagonal of the unit bidiagonal factor U from the U**T*D*U factorization of A.) B (input/output) 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) 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 leading minor of order i is not posi- tive definite, and the solution has not been computed. The factorization has not been completed unless i = N. 7 Nov 2015 sptsv(3P)