dger.c

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/* DGER.F -- translated by f2c (version 19941215).
   You must link the resulting object file with the libraries:
        -lf2c -lm   (in that order)
*/

#include "f2c.h"
#include "cblasimpexp.h"


/* *********************************************************************** */

/* Subroutine */ int __IMPEXP__ dger_(m, n, alpha, x, incx, y, incy, a, lda)
integer *m, *n;
doublereal *alpha, *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 */
    static integer info;
    static doublereal temp;
    static integer i, j, ix, jy, kx;
    extern /* Subroutine */ int xerbla_();

/*     .. 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. */

/*  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  - 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 .. */
/*     .. */
/*     .. Executable Statements .. */

/*     Test the input parameters. */

    /* Parameter adjustments */
    --x;
    --y;
    a_dim1 = *lda;
    a_offset = a_dim1 + 1;
    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, 6L);
        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_ */

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