dpotrf - tive definite matrix A
SUBROUTINE DPOTRF(UPLO, N, A, LDA, INFO) CHARACTER*1 UPLO INTEGER N, LDA, INFO DOUBLE PRECISION A(LDA,*) SUBROUTINE DPOTRF_64(UPLO, N, A, LDA, INFO) CHARACTER*1 UPLO INTEGER*8 N, LDA, INFO DOUBLE PRECISION A(LDA,*) F95 INTERFACE SUBROUTINE POTRF(UPLO, N, A, LDA, INFO) CHARACTER(LEN=1) :: UPLO INTEGER :: N, LDA, INFO REAL(8), DIMENSION(:,:) :: A SUBROUTINE POTRF_64(UPLO, N, A, LDA, INFO) CHARACTER(LEN=1) :: UPLO INTEGER(8) :: N, LDA, INFO REAL(8), DIMENSION(:,:) :: A C INTERFACE #include <sunperf.h> void dpotrf(char uplo, int n, double *a, int lda, int *info); void dpotrf_64(char uplo, long n, double *a, long lda, long *info);
Oracle Solaris Studio Performance Library dpotrf(3P) NAME dpotrf - compute the Cholesky factorization of a real symmetric posi- tive definite matrix A SYNOPSIS SUBROUTINE DPOTRF(UPLO, N, A, LDA, INFO) CHARACTER*1 UPLO INTEGER N, LDA, INFO DOUBLE PRECISION A(LDA,*) SUBROUTINE DPOTRF_64(UPLO, N, A, LDA, INFO) CHARACTER*1 UPLO INTEGER*8 N, LDA, INFO DOUBLE PRECISION A(LDA,*) F95 INTERFACE SUBROUTINE POTRF(UPLO, N, A, LDA, INFO) CHARACTER(LEN=1) :: UPLO INTEGER :: N, LDA, INFO REAL(8), DIMENSION(:,:) :: A SUBROUTINE POTRF_64(UPLO, N, A, LDA, INFO) CHARACTER(LEN=1) :: UPLO INTEGER(8) :: N, LDA, INFO REAL(8), DIMENSION(:,:) :: A C INTERFACE #include <sunperf.h> void dpotrf(char uplo, int n, double *a, int lda, int *info); void dpotrf_64(char uplo, long n, double *a, long lda, long *info); PURPOSE dpotrf computes the Cholesky factorization of a real symmetric positive definite matrix A. The factorization has the form A = U**T * U, if UPLO = 'U', or A = L * L**T, if UPLO = 'L', where U is an upper triangular matrix and L is lower triangular. This is the block version of the algorithm, calling Level 3 BLAS. 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. A (input/output) On entry, the symmetric matrix A. If UPLO = 'U', the leading N-by-N upper triangular part of A contains the upper triangu- lar part of the matrix A, and the strictly lower triangular part of A is not referenced. If UPLO = 'L', the leading N- by-N lower triangular part of A contains the lower triangular part of the matrix A, and the strictly upper triangular part of A is not referenced. On exit, if INFO = 0, the factor U or L from the Cholesky factorization A = U**T*U or A = L*L**T. LDA (input) The leading dimension of the array A. LDA >= 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 factorization could not be completed. 7 Nov 2015 dpotrf(3P)