mirror of
https://github.com/opencv/opencv.git
synced 2024-11-29 22:00:25 +08:00
182 lines
4.4 KiB
C
182 lines
4.4 KiB
C
#include "clapack.h"
|
|
|
|
/* Subroutine */ int dger_(integer *m, integer *n, doublereal *alpha,
|
|
doublereal *x, integer *incx, doublereal *y, integer *incy,
|
|
doublereal *a, integer *lda)
|
|
{
|
|
/* System generated locals */
|
|
integer a_dim1, a_offset, i__1, i__2;
|
|
|
|
/* Local variables */
|
|
integer i__, j, ix, jy, kx, info;
|
|
doublereal temp;
|
|
extern /* Subroutine */ int xerbla_(char *, integer *);
|
|
|
|
/* .. Scalar Arguments .. */
|
|
/* .. */
|
|
/* .. Array Arguments .. */
|
|
/* .. */
|
|
|
|
/* Purpose */
|
|
/* ======= */
|
|
|
|
/* DGER 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. */
|
|
|
|
/* Arguments */
|
|
/* ========== */
|
|
|
|
/* 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 - DOUBLE PRECISION. */
|
|
/* On entry, ALPHA specifies the scalar alpha. */
|
|
/* Unchanged on exit. */
|
|
|
|
/* X - DOUBLE PRECISION 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 - DOUBLE PRECISION 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 - DOUBLE PRECISION 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 .. */
|
|
/* .. */
|
|
/* .. Local Scalars .. */
|
|
/* .. */
|
|
/* .. External Subroutines .. */
|
|
/* .. */
|
|
/* .. Intrinsic Functions .. */
|
|
/* .. */
|
|
|
|
/* Test the input parameters. */
|
|
|
|
/* Parameter adjustments */
|
|
--x;
|
|
--y;
|
|
a_dim1 = *lda;
|
|
a_offset = 1 + a_dim1;
|
|
a -= a_offset;
|
|
|
|
/* Function Body */
|
|
info = 0;
|
|
if (*m < 0) {
|
|
info = 1;
|
|
} else if (*n < 0) {
|
|
info = 2;
|
|
} else if (*incx == 0) {
|
|
info = 5;
|
|
} else if (*incy == 0) {
|
|
info = 7;
|
|
} else if (*lda < max(1,*m)) {
|
|
info = 9;
|
|
}
|
|
if (info != 0) {
|
|
xerbla_("DGER ", &info);
|
|
return 0;
|
|
}
|
|
|
|
/* Quick return if possible. */
|
|
|
|
if (*m == 0 || *n == 0 || *alpha == 0.) {
|
|
return 0;
|
|
}
|
|
|
|
/* Start the operations. In this version the elements of A are */
|
|
/* accessed sequentially with one pass through A. */
|
|
|
|
if (*incy > 0) {
|
|
jy = 1;
|
|
} else {
|
|
jy = 1 - (*n - 1) * *incy;
|
|
}
|
|
if (*incx == 1) {
|
|
i__1 = *n;
|
|
for (j = 1; j <= i__1; ++j) {
|
|
if (y[jy] != 0.) {
|
|
temp = *alpha * y[jy];
|
|
i__2 = *m;
|
|
for (i__ = 1; i__ <= i__2; ++i__) {
|
|
a[i__ + j * a_dim1] += x[i__] * temp;
|
|
/* L10: */
|
|
}
|
|
}
|
|
jy += *incy;
|
|
/* L20: */
|
|
}
|
|
} else {
|
|
if (*incx > 0) {
|
|
kx = 1;
|
|
} else {
|
|
kx = 1 - (*m - 1) * *incx;
|
|
}
|
|
i__1 = *n;
|
|
for (j = 1; j <= i__1; ++j) {
|
|
if (y[jy] != 0.) {
|
|
temp = *alpha * y[jy];
|
|
ix = kx;
|
|
i__2 = *m;
|
|
for (i__ = 1; i__ <= i__2; ++i__) {
|
|
a[i__ + j * a_dim1] += x[ix] * temp;
|
|
ix += *incx;
|
|
/* L30: */
|
|
}
|
|
}
|
|
jy += *incy;
|
|
/* L40: */
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
/* End of DGER . */
|
|
|
|
} /* dger_ */
|