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1 <html>
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2 <head>
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3 <title>MayaChemTools:Code:Constants.pm</title>
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4 <meta http-equiv="content-type" content="text/html;charset=utf-8">
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5 <link rel="stylesheet" type="text/css" href="../../../css/MayaChemToolsCode.css">
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6 </head>
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7 <body leftmargin="20" rightmargin="20" topmargin="10" bottommargin="10">
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8 <br/>
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9 <center>
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10 <a href="http://www.mayachemtools.org" title="MayaChemTools Home"><img src="../../../images/MayaChemToolsLogo.gif" border="0" alt="MayaChemTools"></a>
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11 </center>
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12 <br/>
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13 <pre>
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14 <a name="package-Constants-"></a> 1 <span class="k">package </span><span class="i">Constants</span><span class="sc">;</span>
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15 2 <span class="c">#</span>
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16 3 <span class="c"># $RCSfile: Constants.pm,v $</span>
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17 4 <span class="c"># $Date: 2015/02/28 20:47:02 $</span>
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18 5 <span class="c"># $Revision: 1.21 $</span>
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19 6 <span class="c">#</span>
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20 7 <span class="c"># Author: Manish Sud &lt;msud@san.rr.com&gt;</span>
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21 8 <span class="c">#</span>
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22 9 <span class="c"># Copyright (C) 2015 Manish Sud. All rights reserved.</span>
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23 10 <span class="c">#</span>
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24 11 <span class="c"># This file is part of MayaChemTools.</span>
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25 12 <span class="c">#</span>
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26 13 <span class="c"># MayaChemTools is free software; you can redistribute it and/or modify it under</span>
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27 14 <span class="c"># the terms of the GNU Lesser General Public License as published by the Free</span>
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28 15 <span class="c"># Software Foundation; either version 3 of the License, or (at your option) any</span>
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29 16 <span class="c"># later version.</span>
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30 17 <span class="c">#</span>
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31 18 <span class="c"># MayaChemTools is distributed in the hope that it will be useful, but without</span>
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32 19 <span class="c"># any warranty; without even the implied warranty of merchantability of fitness</span>
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33 20 <span class="c"># for a particular purpose. See the GNU Lesser General Public License for more</span>
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34 21 <span class="c"># details.</span>
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35 22 <span class="c">#</span>
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36 23 <span class="c"># You should have received a copy of the GNU Lesser General Public License</span>
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37 24 <span class="c"># along with MayaChemTools; if not, see &lt;http://www.gnu.org/licenses/&gt; or</span>
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38 25 <span class="c"># write to the Free Software Foundation Inc., 59 Temple Place, Suite 330,</span>
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39 26 <span class="c"># Boston, MA, 02111-1307, USA.</span>
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40 27 <span class="c">#</span>
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41 28
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42 29 <span class="k">use</span> <span class="w">strict</span><span class="sc">;</span>
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43 30 <span class="k">use</span> <span class="w">Exporter</span><span class="sc">;</span>
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44 31
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45 32 <span class="k">use</span> <span class="w">vars</span> <span class="q">qw(@ISA @EXPORT @EXPORT_OK %EXPORT_TAGS)</span><span class="sc">;</span>
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46 33
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47 34 <span class="i">@ISA</span> = <span class="q">qw(Exporter)</span><span class="sc">;</span>
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48 35
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49 36 <span class="c"># Groups of constants...</span>
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50 37 <span class="k">my</span><span class="s">(</span><span class="i">@MathConstants</span><span class="s">)</span> = <span class="q">qw(Pi TwoPi PiByTwo PiByFour InversePi OneByPi SqrtTwoPi OneBySqrtTwoPi InverseSqrtTwoPi Phi E BigNumber)</span><span class="sc">;</span>
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51 38
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52 39 <span class="c"># Export all constants...</span>
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53 40 <span class="i">@EXPORT</span> = <span class="s">(</span><span class="i">@MathConstants</span><span class="s">)</span><span class="sc">;</span>
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54 41 <span class="i">@EXPORT_OK</span> = <span class="q">qw()</span><span class="sc">;</span>
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55 42
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56 43 <span class="c"># Tags to export individual groups of constants...</span>
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57 44 <span class="i">%EXPORT_TAGS</span> = <span class="s">(</span>
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58 45 <span class="w">math</span> <span class="cm">=&gt;</span> <span class="s">[</span><span class="i">@MathConstants</span><span class="s">]</span><span class="cm">,</span>
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59 46 <span class="w">all</span> <span class="cm">=&gt;</span> <span class="s">[</span><span class="i">@EXPORT</span><span class="cm">,</span> <span class="i">@EXPORT_OK</span><span class="s">]</span>
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60 47 <span class="s">)</span><span class="sc">;</span>
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61 48
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62 49 <span class="c"># Math constants..</span>
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63 50 <span class="k">use</span> <span class="w">constant</span> <span class="s">{</span>
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64 51 <span class="w">Pi</span> <span class="cm">=&gt;</span> <span class="i">CORE::</span><span class="k">atan2</span><span class="s">(</span><span class="n">0</span><span class="cm">,</span> <span class="n">-1</span><span class="s">)</span><span class="cm">,</span>
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65 52 <span class="w">TwoPi</span> <span class="cm">=&gt;</span> <span class="n">2</span> * <span class="i">CORE::</span><span class="k">atan2</span><span class="s">(</span><span class="n">0</span><span class="cm">,</span> <span class="n">-1</span><span class="s">)</span><span class="cm">,</span>
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66 53 <span class="w">PiByTwo</span> <span class="cm">=&gt;</span> <span class="i">CORE::</span><span class="k">atan2</span><span class="s">(</span><span class="n">1</span><span class="cm">,</span> <span class="n">0</span><span class="s">)</span><span class="cm">,</span>
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67 54 <span class="w">PiByFour</span> <span class="cm">=&gt;</span> <span class="i">CORE::</span><span class="k">atan2</span><span class="s">(</span><span class="n">1</span><span class="cm">,</span> <span class="n">1</span><span class="s">)</span><span class="cm">,</span>
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68 55 <span class="w">OneByPi</span> <span class="cm">=&gt;</span> <span class="n">1.0</span> / <span class="i">CORE::</span><span class="k">atan2</span><span class="s">(</span><span class="n">0</span><span class="cm">,</span> <span class="n">-1</span><span class="s">)</span><span class="cm">,</span>
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69 56 <span class="w">InversePi</span> <span class="cm">=&gt;</span> <span class="n">1.0</span> / <span class="i">CORE::</span><span class="k">atan2</span><span class="s">(</span><span class="n">0</span><span class="cm">,</span> <span class="n">-1</span><span class="s">)</span><span class="cm">,</span>
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70 57 <span class="w">SqrtTwoPi</span> <span class="cm">=&gt;</span> <span class="i">CORE::</span><span class="k">sqrt</span><span class="s">(</span><span class="n">2</span> * <span class="i">CORE::</span><span class="k">atan2</span><span class="s">(</span><span class="n">0</span><span class="cm">,</span> <span class="n">-1</span><span class="s">)</span><span class="s">)</span><span class="cm">,</span>
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71 58 <span class="w">OneBySqrtTwoPi</span> <span class="cm">=&gt;</span> <span class="n">1</span> / <span class="i">CORE::</span><span class="k">sqrt</span><span class="s">(</span><span class="n">2</span> * <span class="i">CORE::</span><span class="k">atan2</span><span class="s">(</span><span class="n">0</span><span class="cm">,</span> <span class="n">-1</span><span class="s">)</span><span class="s">)</span><span class="cm">,</span>
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72 59 <span class="w">InverseSqrtTwoPi</span> <span class="cm">=&gt;</span> <span class="n">1</span> / <span class="i">CORE::</span><span class="k">sqrt</span><span class="s">(</span><span class="n">2</span> * <span class="i">CORE::</span><span class="k">atan2</span><span class="s">(</span><span class="n">0</span><span class="cm">,</span> <span class="n">-1</span><span class="s">)</span><span class="s">)</span><span class="cm">,</span>
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73 60
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74 61 <span class="w">Phi</span> <span class="cm">=&gt;</span> <span class="s">(</span><span class="n">1</span> + <span class="i">CORE::</span><span class="k">sqrt</span><span class="s">(</span><span class="n">5</span><span class="s">)</span><span class="s">)</span>/<span class="n">2</span><span class="cm">,</span> <span class="c"># Golden ratio...</span>
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75 62
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76 63 <span class="w">E</span> <span class="cm">=&gt;</span> <span class="i">CORE::</span><span class="k">exp</span><span class="s">(</span><span class="n">1</span><span class="s">)</span><span class="cm">,</span>
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77 64
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78 65 <span class="w">BigNumber</span> <span class="cm">=&gt;</span> <span class="n">2</span>**<span class="n">31</span> - <span class="n">1</span><span class="cm">,</span> <span class="c"># Unsigned 31 bit number</span>
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79 66
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80 67 <span class="s">}</span><span class="sc">;</span>
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81 68
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82 <a name="EOF-"></a></pre>
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83 <p>&nbsp;</p>
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84 <br />
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85 <center>
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86 <img src="../../../images/h2o2.png">
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87 </center>
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88 </body>
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89 </html>