dpptrs - solve a system of linear equations A*X = B with a symmetric positive definite matrix A in packed storage using the Cholesky factor- ization A = U**T*U or A = L*L**T computed by DPPTRF
SUBROUTINE DPPTRS(UPLO, N, NRHS, A, B, LDB, INFO) CHARACTER*1 UPLO INTEGER N, NRHS, LDB, INFO DOUBLE PRECISION A(*), B(LDB,*) SUBROUTINE DPPTRS_64(UPLO, N, NRHS, A, B, LDB, INFO) CHARACTER*1 UPLO INTEGER*8 N, NRHS, LDB, INFO DOUBLE PRECISION A(*), B(LDB,*) F95 INTERFACE SUBROUTINE PPTRS(UPLO, N, NRHS, A, B, LDB, INFO) CHARACTER(LEN=1) :: UPLO INTEGER :: N, NRHS, LDB, INFO REAL(8), DIMENSION(:) :: A REAL(8), DIMENSION(:,:) :: B SUBROUTINE PPTRS_64(UPLO, N, NRHS, A, B, LDB, INFO) CHARACTER(LEN=1) :: UPLO INTEGER(8) :: N, NRHS, LDB, INFO REAL(8), DIMENSION(:) :: A REAL(8), DIMENSION(:,:) :: B C INTERFACE #include <sunperf.h> void dpptrs(char uplo, int n, int nrhs, double *a, double *b, int ldb, int *info); void dpptrs_64(char uplo, long n, long nrhs, double *a, double *b, long ldb, long *info);
Oracle Solaris Studio Performance Library dpptrs(3P) NAME dpptrs - solve a system of linear equations A*X = B with a symmetric positive definite matrix A in packed storage using the Cholesky factor- ization A = U**T*U or A = L*L**T computed by DPPTRF SYNOPSIS SUBROUTINE DPPTRS(UPLO, N, NRHS, A, B, LDB, INFO) CHARACTER*1 UPLO INTEGER N, NRHS, LDB, INFO DOUBLE PRECISION A(*), B(LDB,*) SUBROUTINE DPPTRS_64(UPLO, N, NRHS, A, B, LDB, INFO) CHARACTER*1 UPLO INTEGER*8 N, NRHS, LDB, INFO DOUBLE PRECISION A(*), B(LDB,*) F95 INTERFACE SUBROUTINE PPTRS(UPLO, N, NRHS, A, B, LDB, INFO) CHARACTER(LEN=1) :: UPLO INTEGER :: N, NRHS, LDB, INFO REAL(8), DIMENSION(:) :: A REAL(8), DIMENSION(:,:) :: B SUBROUTINE PPTRS_64(UPLO, N, NRHS, A, B, LDB, INFO) CHARACTER(LEN=1) :: UPLO INTEGER(8) :: N, NRHS, LDB, INFO REAL(8), DIMENSION(:) :: A REAL(8), DIMENSION(:,:) :: B C INTERFACE #include <sunperf.h> void dpptrs(char uplo, int n, int nrhs, double *a, double *b, int ldb, int *info); void dpptrs_64(char uplo, long n, long nrhs, double *a, double *b, long ldb, long *info); PURPOSE dpptrs solves a system of linear equations A*X = B with a symmetric positive definite matrix A in packed storage using the Cholesky factor- ization A = U**T*U or A = L*L**T computed by DPPTRF. ARGUMENTS UPLO (input) = 'U': Upper triangle of A is stored; = 'L': Lower triangle of A is stored. 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 triangular factor U or L from the Cholesky factorization A = U**T*U or A = L*L**T, packed columnwise in a linear array. The j-th column of U or L is stored in the array A as follows: if UPLO = 'U', A(i + (j-1)*j/2) = U(i,j) for 1<=i<=j; if UPLO = 'L', A(i + (j-1)*(2n-j)/2) = L(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, the solu- tion 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 7 Nov 2015 dpptrs(3P)