sger.c

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/* blas/sger.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 SGER  ( M, N, ALPHA, X, INCX, Y, INCY, A, LDA ) >*/
/* Subroutine */ int sger_(integer *m, integer *n, real *alpha, real *x, 
        integer *incx, real *y, integer *incy, real *a, integer *lda)
{
    /* System generated locals */
    integer a_dim1, a_offset, i__1, i__2;

    /* Local variables */
    integer i__, j, ix, jy, kx, info;
    real temp;
    extern /* Subroutine */ int xerbla_(char *, integer *, ftnlen);

/*     .. Scalar Arguments .. */
/*<       REAL               ALPHA >*/
/*<       INTEGER            INCX, INCY, LDA, M, N >*/
/*     .. Array Arguments .. */
/*<       REAL               A( LDA, * ), X( * ), Y( * ) >*/
/*     .. */

/*  Purpose */
/*  ======= */

/*  SGER   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  - REAL            . */
/*           On entry, ALPHA specifies the scalar alpha. */
/*           Unchanged on exit. */

/*  X      - REAL             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      - REAL             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      - REAL             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 .. */
/*<       REAL               ZERO >*/
/*<       PARAMETER        ( ZERO = 0.0E+0 ) >*/
/*     .. Local Scalars .. */
/*<       REAL               TEMP >*/
/*<       INTEGER            I, INFO, IX, J, JY, KX >*/
/*     .. External Subroutines .. */
/*<       EXTERNAL           XERBLA >*/
/*     .. Intrinsic Functions .. */
/*<       INTRINSIC          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( 'SGER  ', INFO ) >*/
        xerbla_("SGER  ", &info, (ftnlen)6);
/*<          RETURN >*/
        return 0;
/*<       END IF >*/
    }

/*     Quick return if possible. */

/*<    >*/
    if (*m == 0 || *n == 0 || *alpha == (float)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 >*/
            if (y[jy] != (float)0.) {
/*<                TEMP = ALPHA*Y( JY ) >*/
                temp = *alpha * y[jy];
/*<                DO 10, I = 1, M >*/
                i__2 = *m;
                for (i__ = 1; i__ <= i__2; ++i__) {
/*<                   A( I, J ) = A( I, J ) + X( I )*TEMP >*/
                    a[i__ + j * a_dim1] += x[i__] * temp;
/*<    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 >*/
            if (y[jy] != (float)0.) {
/*<                TEMP = ALPHA*Y( JY ) >*/
                temp = *alpha * y[jy];
/*<                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 >*/
                    a[i__ + j * a_dim1] += x[ix] * temp;
/*<                   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 SGER  . */

/*<       END >*/
} /* sger_ */

#ifdef __cplusplus
        }
#endif