source: trunk/libs/libmath/math.h @ 621

Last change on this file since 621 was 469, checked in by alain, 6 years ago

1) Introduce the libsemaphore library.
2) Introduce a small libmath library, required by the "fft" application..
3) Introduce the multithreaded "fft" application.
4) Fix a bad synchronisation bug in the Copy-On-Write mechanism.
File size: 4.9 KB
RevLine 
[469]1/*
2 * math.h - User level <math> library definition.
3 *
4 * Author     Alain Greiner (2016,2017,2018)
5 *
6 * Copyright (c) UPMC Sorbonne Universites
7 *
8 * This file is part of ALMOS-MKH.
9 *
10 * ALMOS-MKH is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; version 2.0 of the License.
13 *
14 * ALMOS-MKH is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
21 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24#ifndef MATH_H_
25#define MATH_H_
26
27/*****************************************************************************************
28 * This file defines the user level, mathematical functions library.
29 * Most of this code is a modification of the <ulibc> library, developped by Sun
30 * Microsystem Inc in 1993, and ported to the ALMOS-MKH 0S in August 2018.
31 ****************************************************************************************/
32
33
34/*****************************************************************************************
35 * This function returns the absolute value of the <x> argument.
36 ****************************************************************************************/
37double  fabs    (double x);
38
39/*****************************************************************************************
40* This function returns the remainder of <x/y>.
41 ****************************************************************************************/
42double  fmod    (double x, double y);
43
44/*****************************************************************************************
45 * This function round to the largest integer value not larger than <x>.
46 ****************************************************************************************/
47double  floor   (double x);
48
49/*****************************************************************************************
50 * This function round to the smallest integer value not less than <x>.
51 ****************************************************************************************/
52double  ceil    (double x);
53
54/*****************************************************************************************
55 * This function returns the sine function of the <x> argument in radian.
56 ****************************************************************************************/
57double  sin             (double x);
58
59/*****************************************************************************************
60 * This function returns the cosine function of the <x> argument in radian.
61 ****************************************************************************************/
62double  cos             (double x);
63
64/*****************************************************************************************
65 * This function returns the value of <x> raised to the power of <y>.
66 ****************************************************************************************/
67double  pow             (double x, double y);
68
69/*****************************************************************************************
70 * This function returns the base-e exponential of <x>.
71 ****************************************************************************************/
72double  exp     (double x);
73
74/*****************************************************************************************
75 * This function returns non-zero if <x> is not a number (NaN).
76 ****************************************************************************************/
77int             isnan   (double x);
78
79/*****************************************************************************************
80 * This function returns non-zero if <x> is infinite.
81 ****************************************************************************************/
82int             isfinite(double x);
83
84/*****************************************************************************************
85 * These functions return x*(2**n), computed by exponent manipulation.
86 ****************************************************************************************/
87double  scalbln (double x, long n);
88double  scalbn  (double x, int n);
89
90/*****************************************************************************************
91 * This function changes the sign of <x> to that of <y>.
92 ****************************************************************************************/
93double  copysign(double x, double y);
94
95/*****************************************************************************************
96 * This function return the integral value nearest to <x> (according to the
97 * prevailing rounding mode) in floating-point format.
98 ****************************************************************************************/
99double  rint    (double x);
100
101
102#endif
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