slauu2(3S)

NAME
     SLAUU2 - compute the product U * U' or L' * L, where the triangular
     factor U or L is stored in the upper or lower triangular part of the
     array A

SYNOPSIS
     SUBROUTINE SLAUU2( UPLO, N, A, LDA, INFO )

         CHARACTER      UPLO

         INTEGER        INFO, LDA, N

         REAL           A( LDA, * )

IMPLEMENTATION
     These routines are part of the SCSL Scientific Library and can be loaded
     using either the -lscs or the -lscs_mp option.  The -lscs_mp option
     directs the linker to use the multi-processor version of the library.

     When linking to SCSL with -lscs or -lscs_mp, the default integer size is
     4 bytes (32 bits). Another version of SCSL is available in which integers
     are 8 bytes (64 bits).  This version allows the user access to larger
     memory sizes and helps when porting legacy Cray codes.  It can be loaded
     by using the -lscs_i8 option or the -lscs_i8_mp option. A program may use
     only one of the two versions; 4-byte integer and 8-byte integer library
     calls cannot be mixed.

PURPOSE
     SLAUU2 computes the product U * U' or L' * 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 unblocked form of the algorithm, calling Level 2 BLAS.


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

     N       (input) INTEGER
             The order of the triangular factor U or L.  N >= 0.

     A       (input/output) REAL 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'; if UPLO = 'L', the lower triangle of A is
             overwritten with the lower triangle of the product L' * L.

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

     INFO    (output) INTEGER
             = 0: successful exit
             < 0: if INFO = -k, the k-th argument had an illegal value

SEE ALSO
     INTRO_LAPACK(3S), INTRO_SCSL(3S)

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