dger-f(3)

dger.f –

Synopsis

Functions/Subroutines

subroutine dger (M, N, ALPHA, X, INCX, Y, INCY, A, LDA)
DGER

Function/Subroutine Documentation

subroutine dger (integerM, integerN, double precisionALPHA, double precision, dimension()X, integerINCX, double precision, dimension()Y, integerINCY, double precision, dimension(lda,*)A, integerLDA)

DGER Purpose:

 DGER performs the rank 1 operation
 A := alpha*x*y**T + A,
 where alpha is a scalar, x is an m element vector, y is an n element
 vector and A is an m by n matrix.

Parameters:

 M is INTEGER
 On entry, M specifies the number of rows of the matrix A.
 M must be at least zero.

 N is INTEGER
 On entry, N specifies the number of columns of the matrix A.
 N must be at least zero.

ALPHA

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

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

INCX

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

 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 is DOUBLE PRECISION array of DIMENSION ( LDA, n ).
 Before entry, the leading m by n part of the array A must
 contain the matrix of coefficients. On exit, A is
 overwritten by 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, m ).

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 131 of file dger.f.

Author