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| 67 | <div class="navpath"><b>itpp</b>::<a class="el" href="classitpp_1_1GF.html">GF</a> |
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| 70 | <div class="contents"> |
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| 71 | <h1>itpp::GF Class Reference</h1><!-- doxytag: class="itpp::GF" -->Galois Field GF(q). |
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| 72 | <a href="#_details">More...</a> |
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| 73 | <p> |
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| 74 | <code>#include <<a class="el" href="galois_8h-source.html">galois.h</a>></code> |
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| 75 | <p> |
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| 76 | |
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| 77 | <p> |
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| 78 | <a href="classitpp_1_1GF-members.html">List of all members.</a><table border="0" cellpadding="0" cellspacing="0"> |
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| 79 | <tr><td></td></tr> |
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| 80 | <tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr> |
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| 81 | <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="0436dff6aebfa5093654a31e0bc6438a"></a><!-- doxytag: member="itpp::GF::GF" ref="0436dff6aebfa5093654a31e0bc6438a" args="()" --> |
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| 82 | </td><td class="memItemRight" valign="bottom"><a class="el" href="classitpp_1_1GF.html#0436dff6aebfa5093654a31e0bc6438a">GF</a> ()</td></tr> |
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| 83 | |
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| 84 | <tr><td class="mdescLeft"> </td><td class="mdescRight">Constructor. <br></td></tr> |
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| 85 | <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="b024dbc1cb60922bb00aecce96d471ed"></a><!-- doxytag: member="itpp::GF::GF" ref="b024dbc1cb60922bb00aecce96d471ed" args="(int qvalue)" --> |
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| 86 | </td><td class="memItemRight" valign="bottom"><a class="el" href="classitpp_1_1GF.html#b024dbc1cb60922bb00aecce96d471ed">GF</a> (int qvalue)</td></tr> |
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| 87 | |
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| 88 | <tr><td class="mdescLeft"> </td><td class="mdescRight">Constructor. <br></td></tr> |
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| 89 | <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="009217ddab835ae84ee843fc328747a7"></a><!-- doxytag: member="itpp::GF::GF" ref="009217ddab835ae84ee843fc328747a7" args="(int qvalue, int inexp)" --> |
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| 90 | </td><td class="memItemRight" valign="bottom"><a class="el" href="classitpp_1_1GF.html#009217ddab835ae84ee843fc328747a7">GF</a> (int qvalue, int inexp)</td></tr> |
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| 91 | |
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| 92 | <tr><td class="mdescLeft"> </td><td class="mdescRight">Constructor. <br></td></tr> |
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| 93 | <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="babae7d9d1b114864d4b00322871512b"></a><!-- doxytag: member="itpp::GF::GF" ref="babae7d9d1b114864d4b00322871512b" args="(const GF &ingf)" --> |
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| 94 | </td><td class="memItemRight" valign="bottom"><a class="el" href="classitpp_1_1GF.html#babae7d9d1b114864d4b00322871512b">GF</a> (const <a class="el" href="classitpp_1_1GF.html">GF</a> &ingf)</td></tr> |
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| 95 | |
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| 96 | <tr><td class="mdescLeft"> </td><td class="mdescRight">Copy constructor. <br></td></tr> |
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| 97 | <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="998f0a59e3bcc6274bd9a7974efa331a"></a><!-- doxytag: member="itpp::GF::set" ref="998f0a59e3bcc6274bd9a7974efa331a" args="(int qvalue, int inexp)" --> |
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| 98 | void </td><td class="memItemRight" valign="bottom"><a class="el" href="classitpp_1_1GF.html#998f0a59e3bcc6274bd9a7974efa331a">set</a> (int qvalue, int inexp)</td></tr> |
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| 99 | |
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| 100 | <tr><td class="mdescLeft"> </td><td class="mdescRight">GF(q) equals <em>alpha</em> ^ <em>inexp</em>. <br></td></tr> |
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| 101 | <tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classitpp_1_1GF.html#5e2187d93e23ec314f5932eb367be2a0">set</a> (int qvalue, const bvec &vectorspace)</td></tr> |
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| 102 | |
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| 103 | <tr><td class="mdescLeft"> </td><td class="mdescRight">GF(q) equals the element that corresponds to the given vector space. <a href="#5e2187d93e23ec314f5932eb367be2a0"></a><br></td></tr> |
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| 104 | <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="92df68dd5d84663cf20c21d1486aed48"></a><!-- doxytag: member="itpp::GF::set_size" ref="92df68dd5d84663cf20c21d1486aed48" args="(int qvalue)" --> |
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| 105 | void </td><td class="memItemRight" valign="bottom"><a class="el" href="classitpp_1_1GF.html#92df68dd5d84663cf20c21d1486aed48">set_size</a> (int qvalue)</td></tr> |
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| 106 | |
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| 107 | <tr><td class="mdescLeft"> </td><td class="mdescRight">set q=2^mvalue <br></td></tr> |
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| 108 | <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="3202541d083d2927dd8ab3f07b18fb59"></a><!-- doxytag: member="itpp::GF::get_size" ref="3202541d083d2927dd8ab3f07b18fb59" args="() const " --> |
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| 109 | int </td><td class="memItemRight" valign="bottom"><a class="el" href="classitpp_1_1GF.html#3202541d083d2927dd8ab3f07b18fb59">get_size</a> () const </td></tr> |
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| 110 | |
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| 111 | <tr><td class="mdescLeft"> </td><td class="mdescRight">Return q. <br></td></tr> |
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| 112 | <tr><td class="memItemLeft" nowrap align="right" valign="top">bvec </td><td class="memItemRight" valign="bottom"><a class="el" href="classitpp_1_1GF.html#f9264d13f184870d06cb25aaf6c105b9">get_vectorspace</a> () const </td></tr> |
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| 113 | |
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| 114 | <tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the vector space representation of GF(q). <a href="#f9264d13f184870d06cb25aaf6c105b9"></a><br></td></tr> |
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| 115 | <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="87beac57ebd7f597cd409b04af9d5920"></a><!-- doxytag: member="itpp::GF::get_value" ref="87beac57ebd7f597cd409b04af9d5920" args="() const " --> |
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| 116 | int </td><td class="memItemRight" valign="bottom"><a class="el" href="classitpp_1_1GF.html#87beac57ebd7f597cd409b04af9d5920">get_value</a> () const </td></tr> |
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| 117 | |
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| 118 | <tr><td class="mdescLeft"> </td><td class="mdescRight">Returns the alpha exponent. <br></td></tr> |
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| 119 | <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="5a5ee69ed611dd6cada367cc241258f1"></a><!-- doxytag: member="itpp::GF::operator==" ref="5a5ee69ed611dd6cada367cc241258f1" args="(const GF &ingf) const " --> |
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| 120 | int </td><td class="memItemRight" valign="bottom"><a class="el" href="classitpp_1_1GF.html#5a5ee69ed611dd6cada367cc241258f1">operator==</a> (const <a class="el" href="classitpp_1_1GF.html">GF</a> &ingf) const </td></tr> |
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| 121 | |
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| 122 | <tr><td class="mdescLeft"> </td><td class="mdescRight">Equality check. <br></td></tr> |
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| 123 | <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="126d10787539dff093bbc04a2456ecca"></a><!-- doxytag: member="itpp::GF::operator!=" ref="126d10787539dff093bbc04a2456ecca" args="(const GF &ingf) const " --> |
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| 124 | int </td><td class="memItemRight" valign="bottom"><a class="el" href="classitpp_1_1GF.html#126d10787539dff093bbc04a2456ecca">operator!=</a> (const <a class="el" href="classitpp_1_1GF.html">GF</a> &ingf) const </td></tr> |
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| 125 | |
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| 126 | <tr><td class="mdescLeft"> </td><td class="mdescRight">Not-equality check. <br></td></tr> |
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| 127 | <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="6baaf62e11dd55e38a5917eaccda8002"></a><!-- doxytag: member="itpp::GF::operator=" ref="6baaf62e11dd55e38a5917eaccda8002" args="(const GF &ingf)" --> |
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| 128 | void </td><td class="memItemRight" valign="bottom"><a class="el" href="classitpp_1_1GF.html#6baaf62e11dd55e38a5917eaccda8002">operator=</a> (const <a class="el" href="classitpp_1_1GF.html">GF</a> &ingf)</td></tr> |
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| 129 | |
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| 130 | <tr><td class="mdescLeft"> </td><td class="mdescRight">GF(q) equals ingf. <br></td></tr> |
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| 131 | <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="8de4f28df9388592904f9cafc3ed13ed"></a><!-- doxytag: member="itpp::GF::operator=" ref="8de4f28df9388592904f9cafc3ed13ed" args="(const int inexp)" --> |
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| 132 | void </td><td class="memItemRight" valign="bottom"><a class="el" href="classitpp_1_1GF.html#8de4f28df9388592904f9cafc3ed13ed">operator=</a> (const int inexp)</td></tr> |
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| 133 | |
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| 134 | <tr><td class="mdescLeft"> </td><td class="mdescRight">GF(q) equals alpha^inexp. <br></td></tr> |
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| 135 | <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="e52540b90d82cc61f87ab440793919ad"></a><!-- doxytag: member="itpp::GF::operator+=" ref="e52540b90d82cc61f87ab440793919ad" args="(const GF &ingf)" --> |
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| 136 | void </td><td class="memItemRight" valign="bottom"><a class="el" href="classitpp_1_1GF.html#e52540b90d82cc61f87ab440793919ad">operator+=</a> (const <a class="el" href="classitpp_1_1GF.html">GF</a> &ingf)</td></tr> |
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| 137 | |
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| 138 | <tr><td class="mdescLeft"> </td><td class="mdescRight">sum of two GF(q) <br></td></tr> |
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| 139 | <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="57c153da205a2b8362f03cbeaac7d2f5"></a><!-- doxytag: member="itpp::GF::operator+" ref="57c153da205a2b8362f03cbeaac7d2f5" args="(const GF &ingf) const " --> |
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| 140 | <a class="el" href="classitpp_1_1GF.html">GF</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classitpp_1_1GF.html#57c153da205a2b8362f03cbeaac7d2f5">operator+</a> (const <a class="el" href="classitpp_1_1GF.html">GF</a> &ingf) const </td></tr> |
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| 141 | |
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| 142 | <tr><td class="mdescLeft"> </td><td class="mdescRight">sum of two GF(q) <br></td></tr> |
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| 143 | <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="77fd7d835894198e7f1d4e6f2df72545"></a><!-- doxytag: member="itpp::GF::operator-=" ref="77fd7d835894198e7f1d4e6f2df72545" args="(const GF &ingf)" --> |
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| 144 | void </td><td class="memItemRight" valign="bottom"><a class="el" href="classitpp_1_1GF.html#77fd7d835894198e7f1d4e6f2df72545">operator-=</a> (const <a class="el" href="classitpp_1_1GF.html">GF</a> &ingf)</td></tr> |
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| 145 | |
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| 146 | <tr><td class="mdescLeft"> </td><td class="mdescRight">Difference of two GF(q), same as sum for q=2^m. <br></td></tr> |
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| 147 | <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="2d8c65c93ecd2e0fb66ec2db0e48d34c"></a><!-- doxytag: member="itpp::GF::operator-" ref="2d8c65c93ecd2e0fb66ec2db0e48d34c" args="(const GF &ingf) const " --> |
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| 148 | <a class="el" href="classitpp_1_1GF.html">GF</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classitpp_1_1GF.html#2d8c65c93ecd2e0fb66ec2db0e48d34c">operator-</a> (const <a class="el" href="classitpp_1_1GF.html">GF</a> &ingf) const </td></tr> |
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| 149 | |
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| 150 | <tr><td class="mdescLeft"> </td><td class="mdescRight">Difference of two GF(q), same as sum for q=2^m. <br></td></tr> |
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| 151 | <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="92e4e4a8aef619814741f771d1e4fdfc"></a><!-- doxytag: member="itpp::GF::operator*=" ref="92e4e4a8aef619814741f771d1e4fdfc" args="(const GF &ingf)" --> |
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| 152 | void </td><td class="memItemRight" valign="bottom"><a class="el" href="classitpp_1_1GF.html#92e4e4a8aef619814741f771d1e4fdfc">operator*=</a> (const <a class="el" href="classitpp_1_1GF.html">GF</a> &ingf)</td></tr> |
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| 153 | |
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| 154 | <tr><td class="mdescLeft"> </td><td class="mdescRight">product of two GF(q) <br></td></tr> |
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| 155 | <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="e6b155ed86bc5eb7bf5593a11fb41483"></a><!-- doxytag: member="itpp::GF::operator*" ref="e6b155ed86bc5eb7bf5593a11fb41483" args="(const GF &ingf) const " --> |
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| 156 | <a class="el" href="classitpp_1_1GF.html">GF</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classitpp_1_1GF.html#e6b155ed86bc5eb7bf5593a11fb41483">operator*</a> (const <a class="el" href="classitpp_1_1GF.html">GF</a> &ingf) const </td></tr> |
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| 157 | |
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| 158 | <tr><td class="mdescLeft"> </td><td class="mdescRight">product of two GF(q) <br></td></tr> |
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| 159 | <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="b789a0bc8f1bd4130b87d01500c1606f"></a><!-- doxytag: member="itpp::GF::operator/=" ref="b789a0bc8f1bd4130b87d01500c1606f" args="(const GF &ingf)" --> |
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| 160 | void </td><td class="memItemRight" valign="bottom"><a class="el" href="classitpp_1_1GF.html#b789a0bc8f1bd4130b87d01500c1606f">operator/=</a> (const <a class="el" href="classitpp_1_1GF.html">GF</a> &ingf)</td></tr> |
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| 161 | |
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| 162 | <tr><td class="mdescLeft"> </td><td class="mdescRight">division of two GF(q) <br></td></tr> |
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| 163 | <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="15d6722131ec097cc5051ab9ba3590cc"></a><!-- doxytag: member="itpp::GF::operator/" ref="15d6722131ec097cc5051ab9ba3590cc" args="(const GF &ingf) const " --> |
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| 164 | <a class="el" href="classitpp_1_1GF.html">GF</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classitpp_1_1GF.html#15d6722131ec097cc5051ab9ba3590cc">operator/</a> (const <a class="el" href="classitpp_1_1GF.html">GF</a> &ingf) const </td></tr> |
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| 165 | |
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| 166 | <tr><td class="mdescLeft"> </td><td class="mdescRight">product of two GF(q) <br></td></tr> |
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| 167 | <tr><td colspan="2"><br><h2>Friends</h2></td></tr> |
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| 168 | <tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="80fbd553165f964a5c4ffcf3c30c9388"></a><!-- doxytag: member="itpp::GF::operator<<" ref="80fbd553165f964a5c4ffcf3c30c9388" args="(std::ostream &os, const GF &ingf)" --> |
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| 169 | std::ostream & </td><td class="memItemRight" valign="bottom"><a class="el" href="classitpp_1_1GF.html#80fbd553165f964a5c4ffcf3c30c9388">operator<<</a> (std::ostream &os, const <a class="el" href="classitpp_1_1GF.html">GF</a> &ingf)</td></tr> |
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| 170 | |
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| 171 | <tr><td class="mdescLeft"> </td><td class="mdescRight">Output stream for GF(q). <br></td></tr> |
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| 172 | </table> |
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| 173 | <hr><a name="_details"></a><h2>Detailed Description</h2> |
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| 174 | Galois Field GF(q). |
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| 175 | <p> |
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| 176 | <dl class="author" compact><dt><b>Author:</b></dt><dd>Tony Ottosson</dd></dl> |
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| 177 | Galois field GF(q), where <em>q</em> = 2^m. Possible <em>m</em> values is <em>m</em> = 1,2,...,16. Elements are given as exponents of the primitive element <em>alpha</em>. Observe that the zeroth element are given as "-1". ( log(0)=-Inf ). <h3>The following primitve polynomials are used to construct the fields:</h3> |
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| 178 | <p> |
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| 179 | <ul> |
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| 180 | <li> |
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| 181 | GF(4): 1+x+x^2 </li> |
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| 182 | <li> |
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| 183 | GF(8): 1+x+x^3 </li> |
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| 184 | <li> |
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| 185 | GF(16): 1+x+x^4 </li> |
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| 186 | <li> |
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| 187 | GF(32): 1+x^2+x^5 </li> |
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| 188 | <li> |
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| 189 | GF(64): 1+x^2+x^6 </li> |
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| 190 | <li> |
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| 191 | GF(128): 1+x^3+x^7 </li> |
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| 192 | <li> |
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| 193 | GF(256): 1+x^2+x^3+x^4+x^8 </li> |
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| 194 | <li> |
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| 195 | GF(512): 1+x^4+x^9 </li> |
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| 196 | <li> |
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| 197 | GF(1024): 1+x^3+x^10 </li> |
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| 198 | <li> |
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| 199 | <a class="el" href="classitpp_1_1GF.html" title="Galois Field GF(q).">GF</a>(2^11): 1+x^2+x^11 </li> |
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| 200 | <li> |
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| 201 | <a class="el" href="classitpp_1_1GF.html" title="Galois Field GF(q).">GF</a>(2^12): 1+x+x^4+x^12 </li> |
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| 202 | <li> |
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| 203 | <a class="el" href="classitpp_1_1GF.html" title="Galois Field GF(q).">GF</a>(2^13): 1+x+x^3+x^4+x^13 </li> |
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| 204 | <li> |
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| 205 | <a class="el" href="classitpp_1_1GF.html" title="Galois Field GF(q).">GF</a>(2^14): 1+x+x^3+x^5+x^14 </li> |
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| 206 | <li> |
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| 207 | <a class="el" href="classitpp_1_1GF.html" title="Galois Field GF(q).">GF</a>(2^15): 1+x+x^15 </li> |
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| 208 | <li> |
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| 209 | <a class="el" href="classitpp_1_1GF.html" title="Galois Field GF(q).">GF</a>(2^16): 1+x+x^3+x^12+x^16 </li> |
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| 210 | </ul> |
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| 211 | <p> |
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| 212 | As indicated it is possible to use this class for binary elements, that is GF(2). However, this is less efficient in storage (each element take 5 bytes of memory) and in speed. If possible use the class BIN instead. Observe, also that the element "0" is called "-1" and "1" called "0". <hr><h2>Member Function Documentation</h2> |
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| 213 | <a class="anchor" name="f9264d13f184870d06cb25aaf6c105b9"></a><!-- doxytag: member="itpp::GF::get_vectorspace" ref="f9264d13f184870d06cb25aaf6c105b9" args="() const " --> |
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| 214 | <div class="memitem"> |
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| 215 | <div class="memproto"> |
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| 216 | <table class="memname"> |
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| 217 | <tr> |
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| 218 | <td class="memname">bvec itpp::GF::get_vectorspace </td> |
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| 219 | <td>(</td> |
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| 220 | <td class="paramname"> </td> |
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| 221 | <td> ) </td> |
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| 222 | <td> const<code> [inline]</code></td> |
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| 223 | </tr> |
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| 224 | </table> |
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| 225 | </div> |
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| 226 | <div class="memdoc"> |
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| 227 | |
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| 228 | <p> |
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| 229 | Returns the vector space representation of GF(q). |
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| 230 | <p> |
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| 231 | The format is (...,c,b,a), where the element x is given as x=...+c*alpha^2+b*alpha+a. |
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| 232 | <p>References <a class="el" href="group__convertfunc.html#g83db366182e10eb823bcd5cb0149adf3">itpp::dec2bin()</a>.</p> |
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| 233 | |
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| 234 | </div> |
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| 235 | </div><p> |
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| 236 | <a class="anchor" name="5e2187d93e23ec314f5932eb367be2a0"></a><!-- doxytag: member="itpp::GF::set" ref="5e2187d93e23ec314f5932eb367be2a0" args="(int qvalue, const bvec &vectorspace)" --> |
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| 237 | <div class="memitem"> |
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| 238 | <div class="memproto"> |
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| 239 | <table class="memname"> |
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| 240 | <tr> |
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| 241 | <td class="memname">void itpp::GF::set </td> |
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| 242 | <td>(</td> |
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| 243 | <td class="paramtype">int </td> |
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| 244 | <td class="paramname"> <em>qvalue</em>, </td> |
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| 245 | </tr> |
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| 246 | <tr> |
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| 247 | <td class="paramkey"></td> |
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| 248 | <td></td> |
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| 249 | <td class="paramtype">const bvec & </td> |
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| 250 | <td class="paramname"> <em>vectorspace</em></td><td> </td> |
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| 251 | </tr> |
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| 252 | <tr> |
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| 253 | <td></td> |
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| 254 | <td>)</td> |
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| 255 | <td></td><td></td><td><code> [inline]</code></td> |
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| 256 | </tr> |
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| 257 | </table> |
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| 258 | </div> |
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| 259 | <div class="memdoc"> |
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| 260 | |
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| 261 | <p> |
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| 262 | GF(q) equals the element that corresponds to the given vector space. |
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| 263 | <p> |
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| 264 | The format is (...,c,b,a), where the element x is given as x=...+c*alpha^2+b*alpha+a. |
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| 265 | <p>References <a class="el" href="group__convertfunc.html#g698adf78bc0f9d36fd5987bc87d543fa">itpp::bin2dec()</a>, <a class="el" href="itassert_8h-source.html#l00107">it_assert_debug</a>, and <a class="el" href="galois_8cpp-source.html#l00042">set_size()</a>.</p> |
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| 266 | |
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| 267 | </div> |
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| 268 | </div><p> |
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| 269 | <hr>The documentation for this class was generated from the following files:<ul> |
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| 270 | <li><a class="el" href="galois_8h-source.html">galois.h</a><li><a class="el" href="galois_8cpp.html">galois.cpp</a></ul> |
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| 271 | </div> |
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| 272 | <hr size="1"><address style="text-align: right;"><small>Generated on Tue Jun 2 10:02:19 2009 for mixpp by |
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| 273 | <a href="http://www.doxygen.org/index.html"> |
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| 274 | <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.8 </small></address> |
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| 275 | </body> |
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| 276 | </html> |
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