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  1 /******************************************************************************
  2 *
  3 * Copyright (C) 2008, The Gentee Group. All rights reserved. 
  4 * This file is part of the Gentee open source project - http://www.gentee.com. 
  5 * 
  6 * THIS FILE IS PROVIDED UNDER THE TERMS OF THE GENTEE LICENSE ("AGREEMENT"). 
  7 * ANY USE, REPRODUCTION OR DISTRIBUTION OF THIS FILE CONSTITUTES RECIPIENTS 
  8 * ACCEPTANCE OF THE AGREEMENT.
  9 *
 10 * Author: Alexey Krivonogov ( gentee )
 11 *
 12 ******************************************************************************/
 13 
 14 /*-----------------------------------------------------------------------------
 15 * Id: math L "Math"
 16 * 
 17 * Summary: Mathematical functions.
 18 *
 19 * List: *, abs, acos, asin, atan, ceil, cos, exp, fabs, floor, ln, log, 
 20            modf, pow, sin, sqrt, tan 
 21 * 
 22 -----------------------------------------------------------------------------*/
 23 
 24 /*-----------------------------------------------------------------------------
 25 * Id: abs F
 26 * 
 27 * Summary: The absolute value for integers |x|. 
 28 *  
 29 * Params: x - An integer value.
 30 *
 31 * Return: The absolute value. 
 32 *
 33 -----------------------------------------------------------------------------*/
 34 
 35 func uint abs( int x )
 36 
 37 /*-----------------------------------------------------------------------------
 38 * Id: acos F
 39 * 
 40 * Summary: Calculating the arc cosine. 
 41 *  
 42 * Params: x - A value for calculating the arc cosine.
 43 *
 44 * Return: The arc cosine of x within the range [ 0; PI ]. 
 45 *
 46 -----------------------------------------------------------------------------*/
 47 
 48 func double acos( double x )
 49 
 50 /*-----------------------------------------------------------------------------
 51 * Id: asin F
 52 * 
 53 * Summary: Calculating the arc sine. 
 54 *  
 55 * Params: x - A value for calculating the arc sine.
 56 *
 57 * Return: The arc cosine of x within the range [ -PI/2 ; PI/2 ]. 
 58 *
 59 -----------------------------------------------------------------------------*/
 60 
 61 func double asin( double x )
 62 
 63 /*-----------------------------------------------------------------------------
 64 * Id: atan F
 65 * 
 66 * Summary: Calculating the arc tangent. 
 67 *  
 68 * Params: x - A value for calculating the arc tangent.
 69 *
 70 * Return: The arc tangent of x within the range [ -PI/2 ; PI/2 ]. 
 71 *
 72 -----------------------------------------------------------------------------*/
 73 
 74 func double atan( double x )
 75 
 76 /*-----------------------------------------------------------------------------
 77 * Id: ceil F
 78 * 
 79 * Desc:    Smallest double integer not less than given.
 80 * Summary: Getting the smallest integer that is greater than or equal to x.  
 81 *  
 82 * Params: x - Floating-point value. 
 83 *
 84 * Return: The closest least integer. 
 85 *
 86 -----------------------------------------------------------------------------*/
 87 
 88 func double ceil( double x )
 89 
 90 /*-----------------------------------------------------------------------------
 91 * Id: cos F
 92 * 
 93 * Summary: Calculating the cosine. 
 94 *  
 95 * Params: x - An angle in radians.
 96 *
 97 * Return: The cosine of x. 
 98 *
 99 -----------------------------------------------------------------------------*/
100 
101 func double cos( double x )
102 
103 /*-----------------------------------------------------------------------------
104 * Id: exp F
105 * 
106 * Summary: Exponential function. 
107 *  
108 * Params: x - A power for the number e.
109 *
110 * Return: The number e raised to the power of x. 
111 *
112 -----------------------------------------------------------------------------*/
113 
114 func double exp( double x )
115 
116 /*-----------------------------------------------------------------------------
117 * Id: fabs F
118 * 
119 * Summary: The absolute value for double |x|. 
120 *  
121 * Params: x - Floating-point value.
122 *
123 * Return: The absolute value. 
124 *
125 -----------------------------------------------------------------------------*/
126 
127 func double fabs( double x )
128 
129 /*-----------------------------------------------------------------------------
130 * Id: floor F
131 * 
132 * Desc:    Largest double integer not greater than given.
133 * Summary: Getting the largest integer that is less than or equal to x.  
134 *  
135 * Params: x - Floating-point value. 
136 *
137 * Return: The closest greatest integer. 
138 *
139 -----------------------------------------------------------------------------*/
140 
141 func double floor( double x )
142 
143 /*-----------------------------------------------------------------------------
144 * Id: ln F
145 * 
146 * Summary: Natural logarithm.  
147 *  
148 * Params: x - Floating-point value.
149 *
150 * Return: The natural logarithm ln( x ).  
151 *
152 -----------------------------------------------------------------------------*/
153 
154 func double ln( double x )
155 
156 /*-----------------------------------------------------------------------------
157 * Id: log F
158 * 
159 * Summary: Common logarithm.  
160 *  
161 * Params: x - Floating-point value.
162 *
163 * Return: The common logarithm log10( x ).  
164 *
165 -----------------------------------------------------------------------------*/
166 
167 func double log( double x )
168 
169 /*-----------------------------------------------------------------------------
170 * Id: modf F
171 * 
172 * Summary: Splitting into whole and fractional parts.  
173 *  
174 * Params: x - Floating-point value.
175           y - A pointer to double for getting the whole part. 
176 *
177 * Return: The fractional part of x.  
178 *
179 -----------------------------------------------------------------------------*/
180 
181 func double modf( double x, uint y )
182 
183 /*-----------------------------------------------------------------------------
184 * Id: pow F
185 * 
186 * Summary: Raising to the power.  
187 *  
188 * Params: x - A base.
189           y - A power. 
190 *
191 * Return: Raising x to the power of y.  
192 *
193 -----------------------------------------------------------------------------*/
194 
195 func double pow( double x, double y )
196 
197 /*-----------------------------------------------------------------------------
198 * Id: sin F
199 * 
200 * Summary: Calculating the sine. 
201 *  
202 * Params: x - An angle in radians.
203 *
204 * Return: The sine of x. 
205 *
206 -----------------------------------------------------------------------------*/
207 
208 func double sin( double x )
209 
210 /*-----------------------------------------------------------------------------
211 * Id: sqrt F
212 * 
213 * Summary: Square root. 
214 *  
215 * Params: x - A positive floating-point value.
216 *
217 * Return: The square root of x.  
218 *
219 -----------------------------------------------------------------------------*/
220 
221 func double sqrt( double x )
222 
223 /*-----------------------------------------------------------------------------
224 ** Id: tan F
225 * 
226 * Summary: Calculating the tangent. 
227 *  
228 * Params: x - An angle in radians.
229 *
230 * Return: The tangent of x.  
231 *
232 -----------------------------------------------------------------------------*/
233 
234 func double tan( double x )
235