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/* blas/zgerc.f -- translated by f2c (version 20050501).
You must link the resulting object file with libf2c:
on Microsoft Windows system, link with libf2c.lib;
on Linux or Unix systems, link with .../path/to/libf2c.a -lm
or, if you install libf2c.a in a standard place, with -lf2c -lm
-- in that order, at the end of the command line, as in
cc *.o -lf2c -lm
Source for libf2c is in /netlib/f2c/libf2c.zip, e.g.,
http://www.netlib.org/f2c/libf2c.zip
*/
#ifdef __cplusplus
extern "C" {
#endif
#include "v3p_netlib.h"
/*< SUBROUTINE ZGERC ( M, N, ALPHA, X, INCX, Y, INCY, A, LDA ) >*/
/* Subroutine */ int zgerc_(integer *m, integer *n, doublecomplex *alpha,
doublecomplex *x, integer *incx, doublecomplex *y, integer *incy,
doublecomplex *a, integer *lda)
{
/* System generated locals */
integer a_dim1, a_offset, i__1, i__2, i__3, i__4, i__5;
doublecomplex z__1, z__2;
/* Builtin functions */
void d_cnjg(doublecomplex *, doublecomplex *);
/* Local variables */
integer i__, j, ix, jy, kx, info;
doublecomplex temp;
extern /* Subroutine */ int xerbla_(char *, integer *, ftnlen);
/* .. Scalar Arguments .. */
/*< COMPLEX*16 ALPHA >*/
/*< INTEGER INCX, INCY, LDA, M, N >*/
/* .. Array Arguments .. */
/*< COMPLEX*16 A( LDA, * ), X( * ), Y( * ) >*/
/* .. */
/* Purpose */
/* ======= */
/* ZGERC performs the rank 1 operation */
/* A := alpha*x*conjg( 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. */
/* 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. */
/* .. Parameters .. */
/*< COMPLEX*16 ZERO >*/
/*< PARAMETER ( ZERO = ( 0.0D+0, 0.0D+0 ) ) >*/
/* .. Local Scalars .. */
/*< COMPLEX*16 TEMP >*/
/*< INTEGER I, INFO, IX, J, JY, KX >*/
/* .. External Subroutines .. */
/*< EXTERNAL XERBLA >*/
/* .. Intrinsic Functions .. */
/*< INTRINSIC DCONJG, MAX >*/
/* .. */
/* .. Executable Statements .. */
/* Test the input parameters. */
/*< INFO = 0 >*/
/* Parameter adjustments */
--x;
--y;
a_dim1 = *lda;
a_offset = 1 + a_dim1;
a -= a_offset;
/* Function Body */
info = 0;
/*< IF ( M.LT.0 )THEN >*/
if (*m < 0) {
/*< INFO = 1 >*/
info = 1;
/*< ELSE IF( N.LT.0 )THEN >*/
} else if (*n < 0) {
/*< INFO = 2 >*/
info = 2;
/*< ELSE IF( INCX.EQ.0 )THEN >*/
} else if (*incx == 0) {
/*< INFO = 5 >*/
info = 5;
/*< ELSE IF( INCY.EQ.0 )THEN >*/
} else if (*incy == 0) {
/*< INFO = 7 >*/
info = 7;
/*< ELSE IF( LDA.LT.MAX( 1, M ) )THEN >*/
} else if (*lda < max(1,*m)) {
/*< INFO = 9 >*/
info = 9;
/*< END IF >*/
}
/*< IF( INFO.NE.0 )THEN >*/
if (info != 0) {
/*< CALL XERBLA( 'ZGERC ', INFO ) >*/
xerbla_("ZGERC ", &info, (ftnlen)6);
/*< RETURN >*/
return 0;
/*< END IF >*/
}
/* Quick return if possible. */
/*< >*/
if (*m == 0 || *n == 0 || (alpha->r == 0. && alpha->i == 0.)) {
return 0;
}
/* Start the operations. In this version the elements of A are */
/* accessed sequentially with one pass through A. */
/*< IF( INCY.GT.0 )THEN >*/
if (*incy > 0) {
/*< JY = 1 >*/
jy = 1;
/*< ELSE >*/
} else {
/*< JY = 1 - ( N - 1 )*INCY >*/
jy = 1 - (*n - 1) * *incy;
/*< END IF >*/
}
/*< IF( INCX.EQ.1 )THEN >*/
if (*incx == 1) {
/*< DO 20, J = 1, N >*/
i__1 = *n;
for (j = 1; j <= i__1; ++j) {
/*< IF( Y( JY ).NE.ZERO )THEN >*/
i__2 = jy;
if (y[i__2].r != 0. || y[i__2].i != 0.) {
/*< TEMP = ALPHA*DCONJG( Y( JY ) ) >*/
d_cnjg(&z__2, &y[jy]);
z__1.r = alpha->r * z__2.r - alpha->i * z__2.i, z__1.i =
alpha->r * z__2.i + alpha->i * z__2.r;
temp.r = z__1.r, temp.i = z__1.i;
/*< DO 10, I = 1, M >*/
i__2 = *m;
for (i__ = 1; i__ <= i__2; ++i__) {
/*< A( I, J ) = A( I, J ) + X( I )*TEMP >*/
i__3 = i__ + j * a_dim1;
i__4 = i__ + j * a_dim1;
i__5 = i__;
z__2.r = x[i__5].r * temp.r - x[i__5].i * temp.i, z__2.i =
x[i__5].r * temp.i + x[i__5].i * temp.r;
z__1.r = a[i__4].r + z__2.r, z__1.i = a[i__4].i + z__2.i;
a[i__3].r = z__1.r, a[i__3].i = z__1.i;
/*< 10 CONTINUE >*/
/* L10: */
}
/*< END IF >*/
}
/*< JY = JY + INCY >*/
jy += *incy;
/*< 20 CONTINUE >*/
/* L20: */
}
/*< ELSE >*/
} else {
/*< IF( INCX.GT.0 )THEN >*/
if (*incx > 0) {
/*< KX = 1 >*/
kx = 1;
/*< ELSE >*/
} else {
/*< KX = 1 - ( M - 1 )*INCX >*/
kx = 1 - (*m - 1) * *incx;
/*< END IF >*/
}
/*< DO 40, J = 1, N >*/
i__1 = *n;
for (j = 1; j <= i__1; ++j) {
/*< IF( Y( JY ).NE.ZERO )THEN >*/
i__2 = jy;
if (y[i__2].r != 0. || y[i__2].i != 0.) {
/*< TEMP = ALPHA*DCONJG( Y( JY ) ) >*/
d_cnjg(&z__2, &y[jy]);
z__1.r = alpha->r * z__2.r - alpha->i * z__2.i, z__1.i =
alpha->r * z__2.i + alpha->i * z__2.r;
temp.r = z__1.r, temp.i = z__1.i;
/*< IX = KX >*/
ix = kx;
/*< DO 30, I = 1, M >*/
i__2 = *m;
for (i__ = 1; i__ <= i__2; ++i__) {
/*< A( I, J ) = A( I, J ) + X( IX )*TEMP >*/
i__3 = i__ + j * a_dim1;
i__4 = i__ + j * a_dim1;
i__5 = ix;
z__2.r = x[i__5].r * temp.r - x[i__5].i * temp.i, z__2.i =
x[i__5].r * temp.i + x[i__5].i * temp.r;
z__1.r = a[i__4].r + z__2.r, z__1.i = a[i__4].i + z__2.i;
a[i__3].r = z__1.r, a[i__3].i = z__1.i;
/*< IX = IX + INCX >*/
ix += *incx;
/*< 30 CONTINUE >*/
/* L30: */
}
/*< END IF >*/
}
/*< JY = JY + INCY >*/
jy += *incy;
/*< 40 CONTINUE >*/
/* L40: */
}
/*< END IF >*/
}
/*< RETURN >*/
return 0;
/* End of ZGERC . */
/*< END >*/
} /* zgerc_ */
#ifdef __cplusplus
}
#endif
|
