LAPACK  3.4.2
LAPACK: Linear Algebra PACKage
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cladiv.f
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1 *> \brief \b CLADIV performs complex division in real arithmetic, avoiding unnecessary overflow.
2 *
3 * =========== DOCUMENTATION ===========
4 *
5 * Online html documentation available at
6 * http://www.netlib.org/lapack/explore-html/
7 *
8 *> \htmlonly
9 *> Download CLADIV + dependencies
10 *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/cladiv.f">
11 *> [TGZ]</a>
12 *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/cladiv.f">
13 *> [ZIP]</a>
14 *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/cladiv.f">
15 *> [TXT]</a>
16 *> \endhtmlonly
17 *
18 * Definition:
19 * ===========
20 *
21 * COMPLEX FUNCTION CLADIV( X, Y )
22 *
23 * .. Scalar Arguments ..
24 * COMPLEX X, Y
25 * ..
26 *
27 *
28 *> \par Purpose:
29 * =============
30 *>
31 *> \verbatim
32 *>
33 *> CLADIV := X / Y, where X and Y are complex. The computation of X / Y
34 *> will not overflow on an intermediary step unless the results
35 *> overflows.
36 *> \endverbatim
37 *
38 * Arguments:
39 * ==========
40 *
41 *> \param[in] X
42 *> \verbatim
43 *> X is COMPLEX
44 *> \endverbatim
45 *>
46 *> \param[in] Y
47 *> \verbatim
48 *> Y is COMPLEX
49 *> The complex scalars X and Y.
50 *> \endverbatim
51 *
52 * Authors:
53 * ========
54 *
55 *> \author Univ. of Tennessee
56 *> \author Univ. of California Berkeley
57 *> \author Univ. of Colorado Denver
58 *> \author NAG Ltd.
59 *
60 *> \date September 2012
61 *
62 *> \ingroup complexOTHERauxiliary
63 *
64 * =====================================================================
65  COMPLEX FUNCTION cladiv( X, Y )
66 *
67 * -- LAPACK auxiliary routine (version 3.4.2) --
68 * -- LAPACK is a software package provided by Univ. of Tennessee, --
69 * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
70 * September 2012
71 *
72 * .. Scalar Arguments ..
73  COMPLEX x, y
74 * ..
75 *
76 * =====================================================================
77 *
78 * .. Local Scalars ..
79  REAL zi, zr
80 * ..
81 * .. External Subroutines ..
82  EXTERNAL sladiv
83 * ..
84 * .. Intrinsic Functions ..
85  INTRINSIC aimag, cmplx, real
86 * ..
87 * .. Executable Statements ..
88 *
89  CALL sladiv( REAL( X ), aimag( x ), REAL( Y ), aimag( y ), zr,
90  $ zi )
91  cladiv = cmplx( zr, zi )
92 *
93  return
94 *
95 * End of CLADIV
96 *
97  END