PLaSK library
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cosq1i.c
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1/* cosq1i.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__3 = 3;
18static integer c_n5 = -5;
19
20/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
21/* * * */
22/* * copyright (c) 2011 by UCAR * */
23/* * * */
24/* * University Corporation for Atmospheric Research * */
25/* * * */
26/* * all rights reserved * */
27/* * * */
28/* * FFTPACK version 5.1 * */
29/* * * */
30/* * A Fortran Package of Fast Fourier * */
31/* * * */
32/* * Subroutines and Example Programs * */
33/* * * */
34/* * by * */
35/* * * */
36/* * Paul Swarztrauber and Dick Valent * */
37/* * * */
38/* * of * */
39/* * * */
40/* * the National Center for Atmospheric Research * */
41/* * * */
42/* * Boulder, Colorado (80307) U.S.A. * */
43/* * * */
44/* * which is sponsored by * */
45/* * * */
46/* * the National Science Foundation * */
47/* * * */
48/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
49
50/* Subroutine */ int cosq1i_(integer *n, doublereal *wsave, integer *lensav,
51 integer *ier)
52{
53 /* System generated locals */
54 integer i__1;
55
56 /* Builtin functions */
57 double log(doublereal), atan(doublereal), cos(doublereal);
58
59 /* Local variables */
60 integer k;
61 doublereal fk, dt, pih;
62 integer ier1, lnsv;
63 extern /* Subroutine */ int rfft1i_(integer *, doublereal *, integer *,
64 integer *), xerfft_(char *, integer *, ftnlen);
65
66
67 /* Parameter adjustments */
68 --wsave;
69
70 /* Function Body */
71 *ier = 0;
72 if (*lensav < (*n << 1) + (integer) (log((doublereal) (*n)) / log(2.)) +
73 4) {
74 *ier = 2;
75 xerfft_("COSQ1I", &c__3, (ftnlen)6);
76 goto L300;
77 }
78
79 pih = atan(1.) * 2.;
80 dt = pih / (doublereal) (*n);
81 fk = 0.;
82 i__1 = *n;
83 for (k = 1; k <= i__1; ++k) {
84 fk += 1.;
85 wsave[k] = cos(fk * dt);
86/* L101: */
87 }
88 lnsv = *n + (integer) (log((doublereal) (*n)) / log(2.)) + 4;
89 rfft1i_(n, &wsave[*n + 1], &lnsv, &ier1);
90 if (ier1 != 0) {
91 *ier = 20;
92 xerfft_("COSQ1I", &c_n5, (ftnlen)6);
93 }
94L300:
95 return 0;
96} /* cosq1i_ */
97