dlauum.f(3)

NAME
dlauum.f -

SYNOPSIS

  Functions/Subroutines

subroutine dlauum (UPLO, N, A, LDA, INFO)
DLAUUM computes the product UUH or LHL, where U and L are upper or lower triangular matrices (blocked algorithm).

Function/Subroutine Documentation

  subroutine dlauum (characterUPLO, integerN, double precision, dimension( lda, * )A, integerLDA, integerINFO)

DLAUUM computes the product UUH or LHL, where U and L are upper or lower triangular matrices (blocked algorithm).

Purpose:

     DLAUUM computes the product U * U**T or L**T * L, where the triangular
     factor U or L is stored in the upper or lower triangular part of
     the array A.

     If UPLO = 'U' or 'u' then the upper triangle of the result is stored,
     overwriting the factor U in A.
     If UPLO = 'L' or 'l' then the lower triangle of the result is stored,
     overwriting the factor L in A.

     This is the blocked form of the algorithm, calling Level 3 BLAS.

Parameters:
    UPLO

              UPLO is CHARACTER*1
              Specifies whether the triangular factor stored in the array A
              is upper or lower triangular:
              = 'U':  Upper triangular
              = 'L':  Lower triangular

    N

              N is INTEGER
              The order of the triangular factor U or L.  N >= 0.

    A

              A is DOUBLE PRECISION array, dimension (LDA,N)
              On entry, the triangular factor U or L.
              On exit, if UPLO = 'U', the upper triangle of A is
              overwritten with the upper triangle of the product U * U**T;
              if UPLO = 'L', the lower triangle of A is overwritten with
              the lower triangle of the product L**T * L.

    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

Author:
    Univ. of Tennessee

    Univ. of California Berkeley

    Univ. of Colorado Denver

    NAG Ltd.

Date:
    September 2012

Definition at line 103 of file dlauum.f.

Author

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