Homepage > Man Pages > Category > Subroutines
Homepage > Man Pages > Name > Z

zgerc

man page of zgerc

zgerc: perform the rank 1 operation A := alpha*x*conjg( y' ) + A,

```NAME
ZGERC - perform the rank 1 operation   A := alpha*x*conjg( y' ) + A,

SYNOPSIS
SUBROUTINE ZGERC ( 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
ZGERC  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
Central Office.  Richard Hanson, Sandia National Labs.

ZGERC(3)
```