c@427: /* dger.f -- translated by f2c (version 20061008).
c@427:    You must link the resulting object file with libf2c:
c@427: 	on Microsoft Windows system, link with libf2c.lib;
c@427: 	on Linux or Unix systems, link with .../path/to/libf2c.a -lm
c@427: 	or, if you install libf2c.a in a standard place, with -lf2c -lm
c@427: 	-- in that order, at the end of the command line, as in
c@427: 		cc *.o -lf2c -lm
c@427: 	Source for libf2c is in /netlib/f2c/libf2c.zip, e.g.,
c@427: 
c@427: 		http://www.netlib.org/f2c/libf2c.zip
c@427: */
c@427: 
c@427: #include "f2c.h"
c@427: #include "blaswrap.h"
c@427: 
c@427: /* Subroutine */ int dger_(integer *m, integer *n, doublereal *alpha, 
c@427: 	doublereal *x, integer *incx, doublereal *y, integer *incy, 
c@427: 	doublereal *a, integer *lda)
c@427: {
c@427:     /* System generated locals */
c@427:     integer a_dim1, a_offset, i__1, i__2;
c@427: 
c@427:     /* Local variables */
c@427:     integer i__, j, ix, jy, kx, info;
c@427:     doublereal temp;
c@427:     extern /* Subroutine */ int xerbla_(char *, integer *);
c@427: 
c@427: /*     .. Scalar Arguments .. */
c@427: /*     .. */
c@427: /*     .. Array Arguments .. */
c@427: /*     .. */
c@427: 
c@427: /*  Purpose */
c@427: /*  ======= */
c@427: 
c@427: /*  DGER   performs the rank 1 operation */
c@427: 
c@427: /*     A := alpha*x*y' + A, */
c@427: 
c@427: /*  where alpha is a scalar, x is an m element vector, y is an n element */
c@427: /*  vector and A is an m by n matrix. */
c@427: 
c@427: /*  Arguments */
c@427: /*  ========== */
c@427: 
c@427: /*  M      - INTEGER. */
c@427: /*           On entry, M specifies the number of rows of the matrix A. */
c@427: /*           M must be at least zero. */
c@427: /*           Unchanged on exit. */
c@427: 
c@427: /*  N      - INTEGER. */
c@427: /*           On entry, N specifies the number of columns of the matrix A. */
c@427: /*           N must be at least zero. */
c@427: /*           Unchanged on exit. */
c@427: 
c@427: /*  ALPHA  - DOUBLE PRECISION. */
c@427: /*           On entry, ALPHA specifies the scalar alpha. */
c@427: /*           Unchanged on exit. */
c@427: 
c@427: /*  X      - DOUBLE PRECISION array of dimension at least */
c@427: /*           ( 1 + ( m - 1 )*abs( INCX ) ). */
c@427: /*           Before entry, the incremented array X must contain the m */
c@427: /*           element vector x. */
c@427: /*           Unchanged on exit. */
c@427: 
c@427: /*  INCX   - INTEGER. */
c@427: /*           On entry, INCX specifies the increment for the elements of */
c@427: /*           X. INCX must not be zero. */
c@427: /*           Unchanged on exit. */
c@427: 
c@427: /*  Y      - DOUBLE PRECISION array of dimension at least */
c@427: /*           ( 1 + ( n - 1 )*abs( INCY ) ). */
c@427: /*           Before entry, the incremented array Y must contain the n */
c@427: /*           element vector y. */
c@427: /*           Unchanged on exit. */
c@427: 
c@427: /*  INCY   - INTEGER. */
c@427: /*           On entry, INCY specifies the increment for the elements of */
c@427: /*           Y. INCY must not be zero. */
c@427: /*           Unchanged on exit. */
c@427: 
c@427: /*  A      - DOUBLE PRECISION array of DIMENSION ( LDA, n ). */
c@427: /*           Before entry, the leading m by n part of the array A must */
c@427: /*           contain the matrix of coefficients. On exit, A is */
c@427: /*           overwritten by the updated matrix. */
c@427: 
c@427: /*  LDA    - INTEGER. */
c@427: /*           On entry, LDA specifies the first dimension of A as declared */
c@427: /*           in the calling (sub) program. LDA must be at least */
c@427: /*           max( 1, m ). */
c@427: /*           Unchanged on exit. */
c@427: 
c@427: 
c@427: /*  Level 2 Blas routine. */
c@427: 
c@427: /*  -- Written on 22-October-1986. */
c@427: /*     Jack Dongarra, Argonne National Lab. */
c@427: /*     Jeremy Du Croz, Nag Central Office. */
c@427: /*     Sven Hammarling, Nag Central Office. */
c@427: /*     Richard Hanson, Sandia National Labs. */
c@427: 
c@427: 
c@427: /*     .. Parameters .. */
c@427: /*     .. */
c@427: /*     .. Local Scalars .. */
c@427: /*     .. */
c@427: /*     .. External Subroutines .. */
c@427: /*     .. */
c@427: /*     .. Intrinsic Functions .. */
c@427: /*     .. */
c@427: 
c@427: /*     Test the input parameters. */
c@427: 
c@427:     /* Parameter adjustments */
c@427:     --x;
c@427:     --y;
c@427:     a_dim1 = *lda;
c@427:     a_offset = 1 + a_dim1;
c@427:     a -= a_offset;
c@427: 
c@427:     /* Function Body */
c@427:     info = 0;
c@427:     if (*m < 0) {
c@427: 	info = 1;
c@427:     } else if (*n < 0) {
c@427: 	info = 2;
c@427:     } else if (*incx == 0) {
c@427: 	info = 5;
c@427:     } else if (*incy == 0) {
c@427: 	info = 7;
c@427:     } else if (*lda < max(1,*m)) {
c@427: 	info = 9;
c@427:     }
c@427:     if (info != 0) {
c@427: 	xerbla_("DGER  ", &info);
c@427: 	return 0;
c@427:     }
c@427: 
c@427: /*     Quick return if possible. */
c@427: 
c@427:     if (*m == 0 || *n == 0 || *alpha == 0.) {
c@427: 	return 0;
c@427:     }
c@427: 
c@427: /*     Start the operations. In this version the elements of A are */
c@427: /*     accessed sequentially with one pass through A. */
c@427: 
c@427:     if (*incy > 0) {
c@427: 	jy = 1;
c@427:     } else {
c@427: 	jy = 1 - (*n - 1) * *incy;
c@427:     }
c@427:     if (*incx == 1) {
c@427: 	i__1 = *n;
c@427: 	for (j = 1; j <= i__1; ++j) {
c@427: 	    if (y[jy] != 0.) {
c@427: 		temp = *alpha * y[jy];
c@427: 		i__2 = *m;
c@427: 		for (i__ = 1; i__ <= i__2; ++i__) {
c@427: 		    a[i__ + j * a_dim1] += x[i__] * temp;
c@427: /* L10: */
c@427: 		}
c@427: 	    }
c@427: 	    jy += *incy;
c@427: /* L20: */
c@427: 	}
c@427:     } else {
c@427: 	if (*incx > 0) {
c@427: 	    kx = 1;
c@427: 	} else {
c@427: 	    kx = 1 - (*m - 1) * *incx;
c@427: 	}
c@427: 	i__1 = *n;
c@427: 	for (j = 1; j <= i__1; ++j) {
c@427: 	    if (y[jy] != 0.) {
c@427: 		temp = *alpha * y[jy];
c@427: 		ix = kx;
c@427: 		i__2 = *m;
c@427: 		for (i__ = 1; i__ <= i__2; ++i__) {
c@427: 		    a[i__ + j * a_dim1] += x[ix] * temp;
c@427: 		    ix += *incx;
c@427: /* L30: */
c@427: 		}
c@427: 	    }
c@427: 	    jy += *incy;
c@427: /* L40: */
c@427: 	}
c@427:     }
c@427: 
c@427:     return 0;
c@427: 
c@427: /*     End of DGER  . */
c@427: 
c@427: } /* dger_ */