NAME

       spotf2.f -

SYNOPSIS

   Functions/Subroutines
       subroutine spotf2 (UPLO, N, A, LDA, INFO)
           SPOTF2 computes the Cholesky factorization of a symmetric/Hermitian positive definite
           matrix (unblocked algorithm).

Function/Subroutine Documentation

   subroutine spotf2 (characterUPLO, integerN, real, dimension( lda, * )A, integerLDA,
       integerINFO)
       SPOTF2 computes the Cholesky factorization of a symmetric/Hermitian positive definite
       matrix (unblocked algorithm).

       Purpose:

            SPOTF2 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 unblocked version of the algorithm, calling Level 2 BLAS.

       Parameters:
           UPLO

                     UPLO is CHARACTER*1
                     Specifies whether the upper or lower triangular part of the
                     symmetric matrix A is stored.
                     = 'U':  Upper triangular
                     = 'L':  Lower triangular

           N

                     N is INTEGER
                     The order of the matrix A.  N >= 0.

           A

                     A is REAL array, dimension (LDA,N)
                     On entry, the symmetric matrix A.  If UPLO = 'U', the leading
                     n by n upper triangular part of A contains the upper
                     triangular 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

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

           INFO

                     INFO is INTEGER
                     = 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
                          positive definite, and the factorization could not be
                          completed.

       Author:
           Univ. of Tennessee

           Univ. of California Berkeley

           Univ. of Colorado Denver

           NAG Ltd.

       Date:
           September 2012

       Definition at line 110 of file spotf2.f.

Author

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