/*  -- translated by f2c (version 20100827).
   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"

/* Subroutine */ int igraphdladiv_(doublereal *a, doublereal *b, doublereal *c__, 
	doublereal *d__, doublereal *p, doublereal *q)
{
    doublereal e, f;


/*  -- 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   
    =======   

    DLADIV performs complex division in  real arithmetic   

                          a + i*b   
               p + i*q = ---------   
                          c + i*d   

    The algorithm is due to Robert L. Smith and can be found   
    in D. Knuth, The art of Computer Programming, Vol.2, p.195   

    Arguments   
    =========   

    A       (input) DOUBLE PRECISION   
    B       (input) DOUBLE PRECISION   
    C       (input) DOUBLE PRECISION   
    D       (input) DOUBLE PRECISION   
            The scalars a, b, c, and d in the above expression.   

    P       (output) DOUBLE PRECISION   
    Q       (output) DOUBLE PRECISION   
            The scalars p and q in the above expression.   

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


    if (abs(*d__) < abs(*c__)) {
	e = *d__ / *c__;
	f = *c__ + *d__ * e;
	*p = (*a + *b * e) / f;
	*q = (*b - *a * e) / f;
    } else {
	e = *c__ / *d__;
	f = *d__ + *c__ * e;
	*p = (*b + *a * e) / f;
	*q = (-(*a) + *b * e) / f;
    }

    return 0;

/*     End of DLADIV */

} /* igraphdladiv_ */

