Technical Reference: Base Operating System and Extensions, Volume 2

SGER or DGER Subroutine

Performs the rank 1 operation.

BLAS Library (libblas.a)

SUBROUTINE SGER(M, N, ALPHA, X, INCX, Y, INCY, A, LDA) REAL ALPHA INTEGER INCX, INCY, LDA, M, N REAL A(LDA,*), X(*), Y(*)

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(*)

The SGER or DGER subroutine performs the rank 1 operation:

A := alpha * x * y' + 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.

M	On entry, M specifies the number of rows of the matrix A; M must be at least 0; unchanged on exit.
N	On entry, N specifies the number of columns of the matrix A; N must be at least 0; unchanged on exit.
ALPHA	On entry, ALPHA specifies the scalar alpha; unchanged on exit.
X	A vector of dimension at least (1 + (M-1) * abs(INCX) ); on entry, the incremented array X must contain the M element vector x; unchanged on exit.
INCX	On entry, INCX specifies the increment for the elements of X; INCX must not be 0; unchanged on exit.
Y	A vector of dimension at least (1 + (N-1) * abs(INCY) ); on entry, the incremented array Y must contain the N element vector y; unchanged on exit.
INCY	On entry, INCY specifies the increment for the elements of Y; INCY must not be 0; unchanged on exit.
A	An array of dimension ( LDA, N ); on 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	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.