ZSCAL(3) BLAS routine ZSCAL(3)NAME
ZSCAL - scales a vector by a constant.
SYNOPSIS
subroutine zscal(n,za,zx,incx)
c scales a vector by a constant.
c jack dongarra, 3/11/78.
c modified to correct problem with negative increment, 8/21/90.
double complex za,zx(1)
integer i,incx,ix,n
if(n.le.0)return
if(incx.eq.1)go to 20
c code for increment not equal to 1
ix = 1
if(incx.lt.0)ix = (-n+1)*incx + 1
do 10 i = 1,n
zx(ix) = za*zx(ix)
ix = ix + incx
10 continue
return
c code for increment equal to 1
20 do 30 i = 1,n
zx(i) = za*zx(i)
30 continue
return
end
PURPOSE BLAS routine 16 October 1992 ZSCAL(3)
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ZGERU(l) BLAS routine ZGERU(l)
NAME
ZGERU - perform the rank 1 operation A := alpha*x*y' + A,
SYNOPSIS
SUBROUTINE ZGERU ( M, N, ALPHA, X, INCX, Y, INCY, A, LDA )
COMPLEX*16 ALPHA
INTEGER INCX, INCY, LDA, M, N
COMPLEX*16 A( LDA, * ), X( * ), Y( * )
PURPOSE
ZGERU 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 - COMPLEX*16 .
On entry, ALPHA specifies the scalar alpha. Unchanged on exit.
X - COMPLEX*16 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 - COMPLEX*16 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 - COMPLEX*16 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 Cen-
tral Office. Richard Hanson, Sandia National Labs.
BLAS routine 16 October 1992 ZGERU(l)
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