dger (l) - Linux Manuals
dger: performs the rank 1 operation A := alpha*x*yaq + A,
NAME
DGER - performs the rank 1 operation A := alpha*x*yaq + A,SYNOPSIS
- SUBROUTINE DGER(M,N,ALPHA,X,INCX,Y,INCY,A,LDA)
- DOUBLE PRECISION ALPHA
- INTEGER INCX,INCY,LDA,M,N
- DOUBLE PRECISION A(LDA,*),X(*),Y(*)
PURPOSE
DGER performs the rank 1 operation
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.
ARGUMENTS
- M - INTEGER.
- On entry, M specifies the number of rows of the matrix A. M must be at least zero. Unchanged on exit.
- N - INTEGER.
- On entry, N specifies the number of columns of the matrix A. N must be at least zero. Unchanged on exit.
- ALPHA - DOUBLE PRECISION.
- On entry, ALPHA specifies the scalar alpha. Unchanged on exit.
- X - 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. Unchanged on exit.
- INCX - INTEGER.
- On entry, INCX specifies the increment for the elements of X. INCX must not be zero. Unchanged on exit.
- Y - 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. Unchanged on exit.
- INCY - INTEGER.
- On entry, INCY specifies the increment for the elements of Y. INCY must not be zero. Unchanged on exit.
- A - 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 - 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 ). Unchanged on exit.
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.