BLAS/SRC/dsyr.f(3)         Library Functions Manual         BLAS/SRC/dsyr.f(3)

NAME
       BLAS/SRC/dsyr.f

SYNOPSIS
   Functions/Subroutines
       subroutine dsyr (uplo, n, alpha, x, incx, a, lda)
           DSYR

Function/Subroutine Documentation
   subroutine dsyr (character uplo, integer n, double precision alpha, double
       precision, dimension(*) x, integer incx, double precision,
       dimension(lda,*) a, integer lda)
       DSYR

       Purpose:


           !>
           !> DSYR   performs the symmetric rank 1 operation
           !>
           !>    A := alpha*x*x**T + A,
           !>
           !> where alpha is a real scalar, x is an n element vector and A is an
           !> n by n symmetric matrix.
           !>

       Parameters
           UPLO

           !>          UPLO is CHARACTER*1
           !>           On entry, UPLO specifies whether the upper or lower
           !>           triangular part of the array A is to be referenced as
           !>           follows:
           !>
           !>              UPLO = 'U' or 'u'   Only the upper triangular part of A
           !>                                  is to be referenced.
           !>
           !>              UPLO = 'L' or 'l'   Only the lower triangular part of A
           !>                                  is to be referenced.
           !>

           N

           !>          N is INTEGER
           !>           On entry, N specifies the order of the matrix A.
           !>           N must be at least zero.
           !>

           ALPHA

           !>          ALPHA is DOUBLE PRECISION.
           !>           On entry, ALPHA specifies the scalar alpha.
           !>

           X

           !>          X is DOUBLE PRECISION array, dimension at least
           !>           ( 1 + ( n - 1 )*abs( INCX ) ).
           !>           Before entry, the incremented array X must contain the n
           !>           element vector x.
           !>

           INCX

           !>          INCX is INTEGER
           !>           On entry, INCX specifies the increment for the elements of
           !>           X. INCX must not be zero.
           !>

           A

           !>          A is DOUBLE PRECISION array, dimension ( LDA, N )
           !>           Before entry with  UPLO = 'U' or 'u', the leading n by n
           !>           upper triangular part of the array A must contain the upper
           !>           triangular part of the symmetric matrix and the strictly
           !>           lower triangular part of A is not referenced. On exit, the
           !>           upper triangular part of the array A is overwritten by the
           !>           upper triangular part of the updated matrix.
           !>           Before entry with UPLO = 'L' or 'l', the leading n by n
           !>           lower triangular part of the array A must contain the lower
           !>           triangular part of the symmetric matrix and the strictly
           !>           upper triangular part of A is not referenced. On exit, the
           !>           lower triangular part of the array A is overwritten by the
           !>           lower triangular part of the updated matrix.
           !>

           LDA

           !>          LDA is INTEGER
           !>           On entry, LDA specifies the first dimension of A as declared
           !>           in the calling (sub) program. LDA must be at least
           !>           max( 1, n ).
           !>

       Author
           Univ. of Tennessee


           Univ. of California Berkeley


           Univ. of Colorado Denver


           NAG Ltd.

       Further Details:


           !>
           !>  Level 2 Blas routine.
           !>
           !>  -- Written on 22-October-1986.
           !>     Jack Dongarra, Argonne National Lab.
           !>     Jeremy Du Croz, Nag Central Office.
           !>     Sven Hammarling, Nag Central Office.
           !>     Richard Hanson, Sandia National Labs.
           !>

       Definition at line 131 of file dsyr.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

LAPACK                          Version 3.12.0              BLAS/SRC/dsyr.f(3)