1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
|
/* dlag2s.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 dlag2s_(integer *m, integer *n, doublereal *a, integer *
lda, real *sa, integer *ldsa, integer *info)
{
/* System generated locals */
integer sa_dim1, sa_offset, a_dim1, a_offset, i__1, i__2;
/* Local variables */
integer i__, j;
doublereal rmax;
extern doublereal slamch_(char *);
/* -- LAPACK PROTOTYPE auxiliary routine (version 3.1.2) -- */
/* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */
/* August 2007 */
/* .. */
/* .. Scalar Arguments .. */
/* .. */
/* .. Array Arguments .. */
/* .. */
/* Purpose */
/* ======= */
/* DLAG2S converts a DOUBLE PRECISION matrix, SA, to a SINGLE */
/* PRECISION matrix, A. */
/* RMAX is the overflow for the SINGLE PRECISION arithmetic */
/* DLAG2S checks that all the entries of A are between -RMAX and */
/* RMAX. If not the convertion is aborted and a flag is raised. */
/* This is an auxiliary routine so there is no argument checking. */
/* Arguments */
/* ========= */
/* M (input) INTEGER */
/* The number of lines of the matrix A. M >= 0. */
/* N (input) INTEGER */
/* The number of columns of the matrix A. N >= 0. */
/* A (input) DOUBLE PRECISION array, dimension (LDA,N) */
/* On entry, the M-by-N coefficient matrix A. */
/* LDA (input) INTEGER */
/* The leading dimension of the array A. LDA >= max(1,M). */
/* SA (output) REAL array, dimension (LDSA,N) */
/* On exit, if INFO=0, the M-by-N coefficient matrix SA; if */
/* INFO>0, the content of SA is unspecified. */
/* LDSA (input) INTEGER */
/* The leading dimension of the array SA. LDSA >= max(1,M). */
/* INFO (output) INTEGER */
/* = 0: successful exit. */
/* = 1: an entry of the matrix A is greater than the SINGLE */
/* PRECISION overflow threshold, in this case, the content */
/* of SA in exit is unspecified. */
/* ========= */
/* .. Local Scalars .. */
/* .. */
/* .. External Functions .. */
/* .. */
/* .. Executable Statements .. */
/* Parameter adjustments */
a_dim1 = *lda;
a_offset = 1 + a_dim1;
a -= a_offset;
sa_dim1 = *ldsa;
sa_offset = 1 + sa_dim1;
sa -= sa_offset;
/* Function Body */
rmax = slamch_("O");
i__1 = *n;
for (j = 1; j <= i__1; ++j) {
i__2 = *m;
for (i__ = 1; i__ <= i__2; ++i__) {
if (a[i__ + j * a_dim1] < -rmax || a[i__ + j * a_dim1] > rmax) {
*info = 1;
goto L30;
}
sa[i__ + j * sa_dim1] = a[i__ + j * a_dim1];
/* L10: */
}
/* L20: */
}
*info = 0;
L30:
return 0;
/* End of DLAG2S */
} /* dlag2s_ */
|
