starpu-max/min-dgels/base/SRC/dlartv.c

/* dlartv.f -- translated by f2c (version 20061008).
   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
*/

#include "f2c.h"
#include "blaswrap.h"

/* Subroutine */ int dlartv_(integer *n, doublereal *x, integer *incx, 
	doublereal *y, integer *incy, doublereal *c__, doublereal *s, integer 
	*incc)
{
    /* System generated locals */
    integer i__1;

    /* Local variables */
    integer i__, ic, ix, iy;
    doublereal xi, yi;


/*  -- LAPACK auxiliary routine (version 3.2) -- */
/*     Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */
/*     November 2006 */

/*     .. Scalar Arguments .. */
/*     .. */
/*     .. Array Arguments .. */
/*     .. */

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

/*  DLARTV applies a vector of real plane rotations to elements of the */
/*  real vectors x and y. For i = 1,2,...,n */

/*     ( x(i) ) := (  c(i)  s(i) ) ( x(i) ) */
/*     ( y(i) )    ( -s(i)  c(i) ) ( y(i) ) */

/*  Arguments */
/*  ========= */

/*  N       (input) INTEGER */
/*          The number of plane rotations to be applied. */

/*  X       (input/output) DOUBLE PRECISION array, */
/*                         dimension (1+(N-1)*INCX) */
/*          The vector x. */

/*  INCX    (input) INTEGER */
/*          The increment between elements of X. INCX > 0. */

/*  Y       (input/output) DOUBLE PRECISION array, */
/*                         dimension (1+(N-1)*INCY) */
/*          The vector y. */

/*  INCY    (input) INTEGER */
/*          The increment between elements of Y. INCY > 0. */

/*  C       (input) DOUBLE PRECISION array, dimension (1+(N-1)*INCC) */
/*          The cosines of the plane rotations. */

/*  S       (input) DOUBLE PRECISION array, dimension (1+(N-1)*INCC) */
/*          The sines of the plane rotations. */

/*  INCC    (input) INTEGER */
/*          The increment between elements of C and S. INCC > 0. */

/*  ===================================================================== */

/*     .. Local Scalars .. */
/*     .. */
/*     .. Executable Statements .. */

    /* Parameter adjustments */
    --s;
    --c__;
    --y;
    --x;

    /* Function Body */
    ix = 1;
    iy = 1;
    ic = 1;
    i__1 = *n;
    for (i__ = 1; i__ <= i__1; ++i__) {
	xi = x[ix];
	yi = y[iy];
	x[ix] = c__[ic] * xi + s[ic] * yi;
	y[iy] = c__[ic] * yi - s[ic] * xi;
	ix += *incx;
	iy += *incy;
	ic += *incc;
/* L10: */
    }
    return 0;

/*     End of DLARTV */

} /* dlartv_ */