PLaSK library
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cosq1b.c
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1/* cosq1b.f -- translated by f2c (version 20100827).
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/* Table of constant values */
16
17static integer c__6 = 6;
18static integer c__8 = 8;
19static integer c__10 = 10;
20static integer c_n5 = -5;
21
22/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
23/* * * */
24/* * copyright (c) 2011 by UCAR * */
25/* * * */
26/* * University Corporation for Atmospheric Research * */
27/* * * */
28/* * all rights reserved * */
29/* * * */
30/* * FFTPACK version 5.1 * */
31/* * * */
32/* * A Fortran Package of Fast Fourier * */
33/* * * */
34/* * Subroutines and Example Programs * */
35/* * * */
36/* * by * */
37/* * * */
38/* * Paul Swarztrauber and Dick Valent * */
39/* * * */
40/* * of * */
41/* * * */
42/* * the National Center for Atmospheric Research * */
43/* * * */
44/* * Boulder, Colorado (80307) U.S.A. * */
45/* * * */
46/* * which is sponsored by * */
47/* * * */
48/* * the National Science Foundation * */
49/* * * */
50/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
51
52/* Subroutine */ int cosq1b_(integer *n, integer *inc, doublereal *x, integer
53 *lenx, doublereal *wsave, integer *lensav, doublereal *work, integer *
54 lenwrk, integer *ier)
55{
56 /* System generated locals */
57 integer x_dim1, x_offset, i__1;
58
59 /* Builtin functions */
60 double log(doublereal), sqrt(doublereal);
61
62 /* Local variables */
63 doublereal x1;
64 integer ier1;
65 extern /* Subroutine */ int cosqb1_(integer *, integer *, doublereal *,
66 doublereal *, doublereal *, integer *);
67 doublereal ssqrt2;
68 extern /* Subroutine */ int xerfft_(char *, integer *, ftnlen);
69
70
71 /* Parameter adjustments */
72 x_dim1 = *inc;
73 x_offset = 1 + x_dim1;
74 x -= x_offset;
75 --wsave;
76 --work;
77
78 /* Function Body */
79 *ier = 0;
80
81 if (*lenx < *inc * (*n - 1) + 1) {
82 *ier = 1;
83 xerfft_("COSQ1B", &c__6, (ftnlen)6);
84 goto L300;
85 } else if (*lensav < (*n << 1) + (integer) (log((doublereal) (*n)) / log(
86 2.)) + 4) {
87 *ier = 2;
88 xerfft_("COSQ1B", &c__8, (ftnlen)6);
89 goto L300;
90 } else if (*lenwrk < *n) {
91 *ier = 3;
92 xerfft_("COSQ1B", &c__10, (ftnlen)6);
93 goto L300;
94 }
95
96 if ((i__1 = *n - 2) < 0) {
97 goto L300;
98 } else if (i__1 == 0) {
99 goto L102;
100 } else {
101 goto L103;
102 }
103L102:
104 ssqrt2 = 1. / sqrt(2.);
105 x1 = x[x_dim1 + 1] + x[(x_dim1 << 1) + 1];
106 x[(x_dim1 << 1) + 1] = ssqrt2 * (x[x_dim1 + 1] - x[(x_dim1 << 1) + 1]);
107 x[x_dim1 + 1] = x1;
108 return 0;
109L103:
110 cosqb1_(n, inc, &x[x_offset], &wsave[1], &work[1], &ier1);
111 if (ier1 != 0) {
112 *ier = 20;
113 xerfft_("COSQ1B", &c_n5, (ftnlen)6);
114 }
115
116L300:
117 return 0;
118} /* cosq1b_ */
119