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     3 <title>MayaChemTools:Code:Constants.pm</title>
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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 <msud@san.rr.com></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 <http://www.gnu.org/licenses/> 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">=></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">=></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">=></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">=></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">=></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">=></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">=></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">=></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">=></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">=></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">=></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">=></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">=></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">=></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> </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>
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