SGER - perform the rank 1 operation A := alpha*x*y' + A,
SYNOPSIS
SUBROUTINE SGER ( M, N, ALPHA, X, INCX, Y, INCY, A, LDA )
REAL ALPHA
INTEGER INCX, INCY, LDA, M, N
REAL A( LDA, * ), X( * ), Y( * )
PURPOSE
SGER 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.
PARAMETERS
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 - REAL .
On entry, ALPHA specifies the scalar alpha.
Unchanged on exit.
X - REAL array of dimension at least
( 1 + ( m - 1 )*abs( INCX ) ). Before entry, the
incremented array X must contain the m element vec
tor x. Unchanged on exit.
INCX - INTEGER.
On entry, INCX specifies the increment for the ele
ments of X. INCX must not be zero. Unchanged on
exit.
Y - REAL array of dimension at least
( 1 + ( n - 1 )*abs( INCY ) ). Before entry, the
incremented array Y must contain the n element vec
tor y. Unchanged on exit.
INCY - INTEGER.
On entry, INCY specifies the increment for the ele
ments of Y. INCY must not be zero. Unchanged on
exit.
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.
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.
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