Function dlapy2_

numpy/linalg/lapack_lite/f2c_d_lapack.c:17229–17277

} /* dlanv2_ */

doublereal dlapy2_(doublereal *x, doublereal *y)
{
    /* System generated locals */
    doublereal ret_val, d__1;

    /* Local variables */
    static doublereal w, z__, xabs, yabs;


/*
    -- LAPACK auxiliary routine (version 3.2) --
    -- LAPACK is a software package provided by Univ. of Tennessee,    --
    -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
       November 2006


    Purpose
    =======

    DLAPY2 returns sqrt(x**2+y**2), taking care not to cause unnecessary
    overflow.

    Arguments
    =========

    X       (input) DOUBLE PRECISION
    Y       (input) DOUBLE PRECISION
            X and Y specify the values x and y.

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


    xabs = abs(*x);
    yabs = abs(*y);
    w = max(xabs,yabs);
    z__ = min(xabs,yabs);
    if (z__ == 0.) {
	ret_val = w;
    } else {
/* Computing 2nd power */
	d__1 = z__ / w;
	ret_val = w * sqrt(d__1 * d__1 + 1.);
    }
    return ret_val;

/*     End of DLAPY2 */

} /* dlapy2_ */

doublereal dlapy3_(doublereal *x, doublereal *y, doublereal *z__)
{