dpotf2 (3p)

Name

dpotf2 - tive definite matrix A

Synopsis

SUBROUTINE DPOTF2(UPLO, N, A, LDA, INFO)

CHARACTER*1 UPLO
INTEGER N, LDA, INFO
DOUBLE PRECISION A(LDA,*)

SUBROUTINE DPOTF2_64(UPLO, N, A, LDA, INFO)

CHARACTER*1 UPLO
INTEGER*8 N, LDA, INFO
DOUBLE PRECISION A(LDA,*)




F95 INTERFACE
SUBROUTINE POTF2(UPLO, N, A, LDA, INFO)

CHARACTER(LEN=1) :: UPLO
INTEGER :: N, LDA, INFO
REAL(8), DIMENSION(:,:) :: A

SUBROUTINE POTF2_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 dpotf2(char uplo, int n, double *a, int lda, int *info);

void dpotf2_64(char uplo, long n, double *a, long lda, long *info);

Description

Oracle Solaris Studio Performance Library                           dpotf2(3P)



NAME
       dpotf2  -  compute the Cholesky factorization of a real symmetric posi-
       tive definite matrix A


SYNOPSIS
       SUBROUTINE DPOTF2(UPLO, N, A, LDA, INFO)

       CHARACTER*1 UPLO
       INTEGER N, LDA, INFO
       DOUBLE PRECISION A(LDA,*)

       SUBROUTINE DPOTF2_64(UPLO, N, A, LDA, INFO)

       CHARACTER*1 UPLO
       INTEGER*8 N, LDA, INFO
       DOUBLE PRECISION A(LDA,*)




   F95 INTERFACE
       SUBROUTINE POTF2(UPLO, N, A, LDA, INFO)

       CHARACTER(LEN=1) :: UPLO
       INTEGER :: N, LDA, INFO
       REAL(8), DIMENSION(:,:) :: A

       SUBROUTINE POTF2_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 dpotf2(char uplo, int n, double *a, int lda, int *info);

       void dpotf2_64(char uplo, long n, double *a, long lda, long *info);



PURPOSE
       dpotf2 computes the Cholesky factorization of a real symmetric positive
       definite matrix A.

       The factorization has the form
          A = U' * U ,  if UPLO = 'U', or
          A = L  * L',  if UPLO = 'L',
       where U is an upper triangular matrix and L is lower triangular.

       This is the unblocked version of the algorithm, calling Level 2 BLAS.


ARGUMENTS
       UPLO (input)
                 Specifies  whether  the upper or lower triangular part of the
                 symmetric matrix A is stored.  = 'U':  Upper triangular
                 = 'L':  Lower triangular


       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'*U  or A = L*L'.


       LDA (input)
                 The leading dimension of the array A.  LDA >= max(1,N).


       INFO (output)
                 = 0: successful exit
                 < 0: if INFO = -k, the k-th argument had an illegal value
                 >  0:  if INFO = k, the leading minor of order k is not posi-
                 tive definite, and the factorization could not be  completed.




                                  7 Nov 2015                        dpotf2(3P)