NAME¶
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 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 - REAL 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 - REAL 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.
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.