C Library Functions - dger (3)
NAME
dger(3f) - [BLAS:DOUBLE_BLAS_LEVEL2]
CONTENTS
Synopsis
Definition
Options
A
Authors
Further Details
See Also
SYNOPSIS
subroutine dger(m,n,alpha,x,incx,y,incy,a,lda)
.. Scalar Arguments .. double precision,intent(in) :: alpha integer,intent(in) :: incx,incy,lda,m,n .. .. Array Arguments .. double precision,intent(in) :: x(*),y(*) double precision,intent(inout) :: a(lda,*) ..
DEFINITION
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.
OPTIONS
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, 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, 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, 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 ).
AUTHORS
o Univ. of Tennessee o Univ. of California Berkeley o Univ. of Colorado Denver o NAG Ltd. date:December 2016
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.
SEE ALSO
Online html documentation available at http://www.netlib.org/lapack/explore-html/
| Nemo Release 3.1 | dger (3) | July 22, 2023 |
