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CentOS 7.0 - man page for dsyr2.f (centos section 3)

dsyr2.f(3)				      LAPACK				       dsyr2.f(3)

NAME
       dsyr2.f -

SYNOPSIS
   Functions/Subroutines
       subroutine dsyr2 (UPLO, N, ALPHA, X, INCX, Y, INCY, A, LDA)
	   DSYR2

Function/Subroutine Documentation
   subroutine dsyr2 (characterUPLO, integerN, double precisionALPHA, double precision,
       dimension(*)X, integerINCX, double precision, dimension(*)Y, integerINCY, double
       precision, dimension(lda,*)A, integerLDA)
       DSYR2 Purpose:

	    DSYR2  performs the symmetric rank 2 operation

	       A := alpha*x*y**T + alpha*y*x**T + A,

	    where alpha is a scalar, x and y are n element vectors 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 of 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.

	   Y

		     Y is DOUBLE PRECISION array of dimension at least
		      ( 1 + ( n - 1 )*abs( INCY ) ).
		      Before entry, the incremented array Y must contain the n
		      element vector y.

	   INCY

		     INCY is INTEGER
		      On entry, INCY specifies the increment for the elements of
		      Y. INCY must not be zero.

	   A

		     A is DOUBLE PRECISION array of 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.

       Date:
	   November 2011

       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 148 of file dsyr2.f.

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

Version 3.4.2				 Tue Sep 25 2012			       dsyr2.f(3)


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