dger.f (3) Linux Manual Page

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

 M is INTEGER

 On entry, M specifies the number of rows of the matrix A.

 M must be at least zero.

N

 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

 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

 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, 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

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