/src/igraph/vendor/lapack/dlabad.c

Source (jump to first uncovered line)
/*  -- translated by f2c (version 20191129).
   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"

/* > \brief \b DLABAD   

    =========== DOCUMENTATION ===========   

   Online html documentation available at   
              http://www.netlib.org/lapack/explore-html/   

   > \htmlonly   
   > Download DLABAD + dependencies   
   > <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/dlabad.
f">   
   > [TGZ]</a>   
   > <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/dlabad.
f">   
   > [ZIP]</a>   
   > <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/dlabad.
f">   
   > [TXT]</a>   
   > \endhtmlonly   

    Definition:   
    ===========   

         SUBROUTINE DLABAD( SMALL, LARGE )   

         DOUBLE PRECISION   LARGE, SMALL   


   > \par Purpose:   
    =============   
   >   
   > \verbatim   
   >   
   > DLABAD takes as input the values computed by DLAMCH for underflow and   
   > overflow, and returns the square root of each of these values if the   
   > log of LARGE is sufficiently large.  This subroutine is intended to   
   > identify machines with a large exponent range, such as the Crays, and   
   > redefine the underflow and overflow limits to be the square roots of   
   > the values computed by DLAMCH.  This subroutine is needed because   
   > DLAMCH does not compensate for poor arithmetic in the upper half of   
   > the exponent range, as is found on a Cray.   
   > \endverbatim   

    Arguments:   
    ==========   

   > \param[in,out] SMALL   
   > \verbatim   
   >          SMALL is DOUBLE PRECISION   
   >          On entry, the underflow threshold as computed by DLAMCH.   
   >          On exit, if LOG10(LARGE) is sufficiently large, the square   
   >          root of SMALL, otherwise unchanged.   
   > \endverbatim   
   >   
   > \param[in,out] LARGE   
   > \verbatim   
   >          LARGE is DOUBLE PRECISION   
   >          On entry, the overflow threshold as computed by DLAMCH.   
   >          On exit, if LOG10(LARGE) is sufficiently large, the square   
   >          root of LARGE, otherwise unchanged.   
   > \endverbatim   

    Authors:   
    ========   

   > \author Univ. of Tennessee   
   > \author Univ. of California Berkeley   
   > \author Univ. of Colorado Denver   
   > \author NAG Ltd.   

   > \date November 2011   

   > \ingroup auxOTHERauxiliary   

    =====================================================================   
   Subroutine */ int igraphdlabad_(doublereal *small, doublereal *large)
{
    /* Builtin functions */
    double d_lg10(doublereal *), sqrt(doublereal);


/*  -- LAPACK auxiliary routine (version 3.4.0) --   
    -- LAPACK is a software package provided by Univ. of Tennessee,    --   
    -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--   
       November 2011   


    =====================================================================   


       If it looks like we're on a Cray, take the square root of   
       SMALL and LARGE to avoid overflow and underflow problems. */

    if (d_lg10(large) > 2e3) {
  *small = sqrt(*small);
  *large = sqrt(*large);
    }

    return 0;

/*     End of DLABAD */

} /* igraphdlabad_ */


Line	Count	Source (jump to first uncovered line)
1		/* -- translated by f2c (version 20191129).
2		You must link the resulting object file with libf2c:
3		on Microsoft Windows system, link with libf2c.lib;
4		on Linux or Unix systems, link with .../path/to/libf2c.a -lm
5		or, if you install libf2c.a in a standard place, with -lf2c -lm
6		-- in that order, at the end of the command line, as in
7		cc *.o -lf2c -lm
8		Source for libf2c is in /netlib/f2c/libf2c.zip, e.g.,
9
10		http://www.netlib.org/f2c/libf2c.zip
11		*/
12
13		#include "f2c.h"
14
15		/* > \brief \b DLABAD
16
17		=========== DOCUMENTATION ===========
18
19		Online html documentation available at
20		http://www.netlib.org/lapack/explore-html/
21
22		> \htmlonly
23		> Download DLABAD + dependencies
24		> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/dlabad.
25		f">
26		> [TGZ]</a>
27		> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/dlabad.
28		f">
29		> [ZIP]</a>
30		> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/dlabad.
31		f">
32		> [TXT]</a>
33		> \endhtmlonly
34
35		Definition:
36		===========
37
38		SUBROUTINE DLABAD( SMALL, LARGE )
39
40		DOUBLE PRECISION LARGE, SMALL
41
42
43		> \par Purpose:
44		=============
45		>
46		> \verbatim
47		>
48		> DLABAD takes as input the values computed by DLAMCH for underflow and
49		> overflow, and returns the square root of each of these values if the
50		> log of LARGE is sufficiently large. This subroutine is intended to
51		> identify machines with a large exponent range, such as the Crays, and
52		> redefine the underflow and overflow limits to be the square roots of
53		> the values computed by DLAMCH. This subroutine is needed because
54		> DLAMCH does not compensate for poor arithmetic in the upper half of
55		> the exponent range, as is found on a Cray.
56		> \endverbatim
57
58		Arguments:
59		==========
60
61		> \param[in,out] SMALL
62		> \verbatim
63		> SMALL is DOUBLE PRECISION
64		> On entry, the underflow threshold as computed by DLAMCH.
65		> On exit, if LOG10(LARGE) is sufficiently large, the square
66		> root of SMALL, otherwise unchanged.
67		> \endverbatim
68		>
69		> \param[in,out] LARGE
70		> \verbatim
71		> LARGE is DOUBLE PRECISION
72		> On entry, the overflow threshold as computed by DLAMCH.
73		> On exit, if LOG10(LARGE) is sufficiently large, the square
74		> root of LARGE, otherwise unchanged.
75		> \endverbatim
76
77		Authors:
78		========
79
80		> \author Univ. of Tennessee
81		> \author Univ. of California Berkeley
82		> \author Univ. of Colorado Denver
83		> \author NAG Ltd.
84
85		> \date November 2011
86
87		> \ingroup auxOTHERauxiliary
88
89		=====================================================================
90		Subroutine / int igraphdlabad_(doublereal small, doublereal *large)
91	0	{
92		/* Builtin functions */
93	0	double d_lg10(doublereal *), sqrt(doublereal);
94
95
96		/* -- LAPACK auxiliary routine (version 3.4.0) --
97		-- LAPACK is a software package provided by Univ. of Tennessee, --
98		-- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
99		November 2011
100
101
102		=====================================================================
103
104
105		If it looks like we're on a Cray, take the square root of
106		SMALL and LARGE to avoid overflow and underflow problems. */
107
108	0	if (d_lg10(large) > 2e3) {
109	0	small = sqrt(small);
110	0	large = sqrt(large);
111	0	}
112
113	0	return 0;
114
115		/* End of DLABAD */
116
117	0	} /* igraphdlabad_ */
118

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Created: 2023-09-25 06:05