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67<h1>log_exp.h File Reference</h1>Logarithmic and exponenential functions - header file. 
68<a href="#_details">More...</a>
69<p>
70<code>#include &lt;<a class="el" href="itcompat_8h-source.html">itpp/base/itcompat.h</a>&gt;</code><br>
71<code>#include &lt;<a class="el" href="help__functions_8h-source.html">itpp/base/help_functions.h</a>&gt;</code><br>
72
73<p>
74<a href="log__exp_8h-source.html">Go to the source code of this file.</a><table border="0" cellpadding="0" cellspacing="0">
75<tr><td></td></tr>
76<tr><td colspan="2"><br><h2>Functions</h2></td></tr>
77<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="g5275297e979272e5102fa31f0fc782b4"></a><!-- doxytag: member="log_exp.h::logb" ref="g5275297e979272e5102fa31f0fc782b4" args="(double b, double x)" -->
78double&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#g5275297e979272e5102fa31f0fc782b4">itpp::logb</a> (double b, double x)</td></tr>
79
80<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Base-b logarithm. <br></td></tr>
81<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="g44da7c49dc0f990f661404a47e2bf9be"></a><!-- doxytag: member="log_exp.h::pow2i" ref="g44da7c49dc0f990f661404a47e2bf9be" args="(int x)" -->
82int&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#g44da7c49dc0f990f661404a47e2bf9be">itpp::pow2i</a> (int x)</td></tr>
83
84<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Calculate two to the power of x (2^x); x is integer. <br></td></tr>
85<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="g84ee8bfb44de3c26fdcb756ecb21d9e9"></a><!-- doxytag: member="log_exp.h::pow2" ref="g84ee8bfb44de3c26fdcb756ecb21d9e9" args="(double x)" -->
86double&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#g84ee8bfb44de3c26fdcb756ecb21d9e9">itpp::pow2</a> (double x)</td></tr>
87
88<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Calculate two to the power of x (2^x). <br></td></tr>
89<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="gc5653517728e4837a91131655b4a18da"></a><!-- doxytag: member="log_exp.h::pow10" ref="gc5653517728e4837a91131655b4a18da" args="(double x)" -->
90double&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#gc5653517728e4837a91131655b4a18da">itpp::pow10</a> (double x)</td></tr>
91
92<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Calculate ten to the power of x (10^x). <br></td></tr>
93<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="g5c448e69f3678181e108e1caead5c28b"></a><!-- doxytag: member="log_exp.h::dB" ref="g5c448e69f3678181e108e1caead5c28b" args="(double x)" -->
94double&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#g5c448e69f3678181e108e1caead5c28b">itpp::dB</a> (double x)</td></tr>
95
96<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Decibel of x (10*log10(x)). <br></td></tr>
97<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="g9a4a3d1188d2ec6a6815c237bd3ab2cc"></a><!-- doxytag: member="log_exp.h::inv_dB" ref="g9a4a3d1188d2ec6a6815c237bd3ab2cc" args="(double x)" -->
98double&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#g9a4a3d1188d2ec6a6815c237bd3ab2cc">itpp::inv_dB</a> (double x)</td></tr>
99
100<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Inverse of decibel of x. <br></td></tr>
101<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="g70cf103d3f9443eb852db037115cd709"></a><!-- doxytag: member="log_exp.h::int2bits" ref="g70cf103d3f9443eb852db037115cd709" args="(int n)" -->
102int&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#g70cf103d3f9443eb852db037115cd709">itpp::int2bits</a> (int n)</td></tr>
103
104<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Calculate the number of bits needed to represent an inteager <code>n</code>. <br></td></tr>
105<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="gef5f3fac5ff2afee6458ea7901323c61"></a><!-- doxytag: member="log_exp.h::levels2bits" ref="gef5f3fac5ff2afee6458ea7901323c61" args="(int n)" -->
106int&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#gef5f3fac5ff2afee6458ea7901323c61">itpp::levels2bits</a> (int n)</td></tr>
107
108<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Calculate the number of bits needed to represent <code>n</code> different values (levels). <br></td></tr>
109<tr><td class="memItemLeft" nowrap align="right" valign="top">double&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#g02907e0ed7d04cde3a43e2a9d00c24c0">itpp::trunc_log</a> (double x)</td></tr>
110
111<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Truncated natural logarithm function.  <a href="group__logexpfunc.html#g02907e0ed7d04cde3a43e2a9d00c24c0"></a><br></td></tr>
112<tr><td class="memItemLeft" nowrap align="right" valign="top">double&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#ga62c8362aeeb68ba0fc65c99267bd1fd">itpp::trunc_exp</a> (double x)</td></tr>
113
114<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Truncated exponential function.  <a href="group__logexpfunc.html#ga62c8362aeeb68ba0fc65c99267bd1fd"></a><br></td></tr>
115<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="g1b295e7695ab2a3290bfadb26a149304"></a><!-- doxytag: member="log_exp.h::log_add" ref="g1b295e7695ab2a3290bfadb26a149304" args="(double log_a, double log_b)" -->
116double&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#g1b295e7695ab2a3290bfadb26a149304">itpp::log_add</a> (double log_a, double log_b)</td></tr>
117
118<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Safe substitute for <code>log(exp(log_a) + exp(log_b))</code>. <br></td></tr>
119<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="gc1495ce5d82dc54376a5550ccc76df7a"></a><!-- doxytag: member="log_exp.h::exp" ref="gc1495ce5d82dc54376a5550ccc76df7a" args="(const vec &amp;x)" -->
120<a class="el" href="classitpp_1_1Vec.html#02e1bb55f60f3c2eb7a020eb1c2cfcf4">vec</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#gc1495ce5d82dc54376a5550ccc76df7a">itpp::exp</a> (const <a class="el" href="classitpp_1_1Vec.html#02e1bb55f60f3c2eb7a020eb1c2cfcf4">vec</a> &amp;x)</td></tr>
121
122<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Exp of the elements of a vector <code>x</code>. <br></td></tr>
123<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="gd4f099ec6f7ad0489d088d815247829c"></a><!-- doxytag: member="log_exp.h::exp" ref="gd4f099ec6f7ad0489d088d815247829c" args="(const cvec &amp;x)" -->
124<a class="el" href="classitpp_1_1Vec.html#e83c1408740e41a7e29c383b71d4d544">cvec</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#gd4f099ec6f7ad0489d088d815247829c">itpp::exp</a> (const <a class="el" href="classitpp_1_1Vec.html#e83c1408740e41a7e29c383b71d4d544">cvec</a> &amp;x)</td></tr>
125
126<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Exp of the elements of a complex vector <code>x</code>. <br></td></tr>
127<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="g42899b4c00b0b5e703ac8dfe04b18ac1"></a><!-- doxytag: member="log_exp.h::exp" ref="g42899b4c00b0b5e703ac8dfe04b18ac1" args="(const mat &amp;m)" -->
128<a class="el" href="classitpp_1_1Mat.html#6bba394f181c76fda12759568986c613">mat</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#g42899b4c00b0b5e703ac8dfe04b18ac1">itpp::exp</a> (const <a class="el" href="classitpp_1_1Mat.html#6bba394f181c76fda12759568986c613">mat</a> &amp;m)</td></tr>
129
130<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Exp of the elements of a matrix <code>m</code>. <br></td></tr>
131<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="g7a3da29d4e6a8c814237453086793335"></a><!-- doxytag: member="log_exp.h::exp" ref="g7a3da29d4e6a8c814237453086793335" args="(const cmat &amp;m)" -->
132<a class="el" href="classitpp_1_1Mat.html#6fbac4b7184807da188e5b85d42f038b">cmat</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#g7a3da29d4e6a8c814237453086793335">itpp::exp</a> (const <a class="el" href="classitpp_1_1Mat.html#6fbac4b7184807da188e5b85d42f038b">cmat</a> &amp;m)</td></tr>
133
134<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Exp of the elements of a complex matrix <code>m</code>. <br></td></tr>
135<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="g0c42d158b1f623f9b72c1ccde7e2fd09"></a><!-- doxytag: member="log_exp.h::pow" ref="g0c42d158b1f623f9b72c1ccde7e2fd09" args="(const double x, const vec &amp;y)" -->
136<a class="el" href="classitpp_1_1Vec.html#02e1bb55f60f3c2eb7a020eb1c2cfcf4">vec</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#g0c42d158b1f623f9b72c1ccde7e2fd09">itpp::pow</a> (const double x, const <a class="el" href="classitpp_1_1Vec.html#02e1bb55f60f3c2eb7a020eb1c2cfcf4">vec</a> &amp;y)</td></tr>
137
138<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Calculates x to the power of y (x^y). <br></td></tr>
139<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="g0c153229b93549e8a6449327a92c934f"></a><!-- doxytag: member="log_exp.h::pow" ref="g0c153229b93549e8a6449327a92c934f" args="(const double x, const mat &amp;y)" -->
140<a class="el" href="classitpp_1_1Mat.html#6bba394f181c76fda12759568986c613">mat</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#g0c153229b93549e8a6449327a92c934f">itpp::pow</a> (const double x, const <a class="el" href="classitpp_1_1Mat.html#6bba394f181c76fda12759568986c613">mat</a> &amp;y)</td></tr>
141
142<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Calculates x to the power of y (x^y). <br></td></tr>
143<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="g9bd8947c2d1056f05812670491668241"></a><!-- doxytag: member="log_exp.h::pow" ref="g9bd8947c2d1056f05812670491668241" args="(const vec &amp;x, const double y)" -->
144<a class="el" href="classitpp_1_1Vec.html#02e1bb55f60f3c2eb7a020eb1c2cfcf4">vec</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#g9bd8947c2d1056f05812670491668241">itpp::pow</a> (const <a class="el" href="classitpp_1_1Vec.html#02e1bb55f60f3c2eb7a020eb1c2cfcf4">vec</a> &amp;x, const double y)</td></tr>
145
146<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Calculates x to the power of y (x^y). <br></td></tr>
147<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="g40f48a75172e7f8bc8e58ed54262a04d"></a><!-- doxytag: member="log_exp.h::pow" ref="g40f48a75172e7f8bc8e58ed54262a04d" args="(const mat &amp;x, const double y)" -->
148<a class="el" href="classitpp_1_1Mat.html#6bba394f181c76fda12759568986c613">mat</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#g40f48a75172e7f8bc8e58ed54262a04d">itpp::pow</a> (const <a class="el" href="classitpp_1_1Mat.html#6bba394f181c76fda12759568986c613">mat</a> &amp;x, const double y)</td></tr>
149
150<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Calculates x to the power of y (x^y). <br></td></tr>
151<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="g054afa4559b8fa4e85e557273bdde7ac"></a><!-- doxytag: member="log_exp.h::pow2" ref="g054afa4559b8fa4e85e557273bdde7ac" args="(const vec &amp;x)" -->
152<a class="el" href="classitpp_1_1Vec.html#02e1bb55f60f3c2eb7a020eb1c2cfcf4">vec</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#g054afa4559b8fa4e85e557273bdde7ac">itpp::pow2</a> (const <a class="el" href="classitpp_1_1Vec.html#02e1bb55f60f3c2eb7a020eb1c2cfcf4">vec</a> &amp;x)</td></tr>
153
154<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Calculates two to the power of x (2^x). <br></td></tr>
155<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="g0035dfbd1fcffdb28cadacba42ad8996"></a><!-- doxytag: member="log_exp.h::pow2" ref="g0035dfbd1fcffdb28cadacba42ad8996" args="(const mat &amp;x)" -->
156<a class="el" href="classitpp_1_1Mat.html#6bba394f181c76fda12759568986c613">mat</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#g0035dfbd1fcffdb28cadacba42ad8996">itpp::pow2</a> (const <a class="el" href="classitpp_1_1Mat.html#6bba394f181c76fda12759568986c613">mat</a> &amp;x)</td></tr>
157
158<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Calculates two to the power of x (2^x). <br></td></tr>
159<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="ge702eea92311fe090faebc2ec9501854"></a><!-- doxytag: member="log_exp.h::pow10" ref="ge702eea92311fe090faebc2ec9501854" args="(const vec &amp;x)" -->
160<a class="el" href="classitpp_1_1Vec.html#02e1bb55f60f3c2eb7a020eb1c2cfcf4">vec</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#ge702eea92311fe090faebc2ec9501854">itpp::pow10</a> (const <a class="el" href="classitpp_1_1Vec.html#02e1bb55f60f3c2eb7a020eb1c2cfcf4">vec</a> &amp;x)</td></tr>
161
162<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Calculates ten to the power of x (10^x). <br></td></tr>
163<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="g4f390e0a4e938e7d9b98613ad66bdf1c"></a><!-- doxytag: member="log_exp.h::pow10" ref="g4f390e0a4e938e7d9b98613ad66bdf1c" args="(const mat &amp;x)" -->
164<a class="el" href="classitpp_1_1Mat.html#6bba394f181c76fda12759568986c613">mat</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#g4f390e0a4e938e7d9b98613ad66bdf1c">itpp::pow10</a> (const <a class="el" href="classitpp_1_1Mat.html#6bba394f181c76fda12759568986c613">mat</a> &amp;x)</td></tr>
165
166<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Calculates ten to the power of x (10^x). <br></td></tr>
167<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="g60e39caa21db1b5f9f6006cf7508fbcb"></a><!-- doxytag: member="log_exp.h::log" ref="g60e39caa21db1b5f9f6006cf7508fbcb" args="(const vec &amp;x)" -->
168<a class="el" href="classitpp_1_1Vec.html#02e1bb55f60f3c2eb7a020eb1c2cfcf4">vec</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#g60e39caa21db1b5f9f6006cf7508fbcb">itpp::log</a> (const <a class="el" href="classitpp_1_1Vec.html#02e1bb55f60f3c2eb7a020eb1c2cfcf4">vec</a> &amp;x)</td></tr>
169
170<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">The natural logarithm of the elements. <br></td></tr>
171<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="g83350f223110246183d90254a7933c75"></a><!-- doxytag: member="log_exp.h::log" ref="g83350f223110246183d90254a7933c75" args="(const mat &amp;x)" -->
172<a class="el" href="classitpp_1_1Mat.html#6bba394f181c76fda12759568986c613">mat</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#g83350f223110246183d90254a7933c75">itpp::log</a> (const <a class="el" href="classitpp_1_1Mat.html#6bba394f181c76fda12759568986c613">mat</a> &amp;x)</td></tr>
173
174<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">The natural logarithm of the elements. <br></td></tr>
175<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="gc4c7043d21d91e79409c75a732b14c3a"></a><!-- doxytag: member="log_exp.h::log" ref="gc4c7043d21d91e79409c75a732b14c3a" args="(const cvec &amp;x)" -->
176<a class="el" href="classitpp_1_1Vec.html#e83c1408740e41a7e29c383b71d4d544">cvec</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#gc4c7043d21d91e79409c75a732b14c3a">itpp::log</a> (const <a class="el" href="classitpp_1_1Vec.html#e83c1408740e41a7e29c383b71d4d544">cvec</a> &amp;x)</td></tr>
177
178<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">The natural logarithm of the elements. <br></td></tr>
179<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="g320dc9f6d27a6cfe4e149633fd1ea566"></a><!-- doxytag: member="log_exp.h::log" ref="g320dc9f6d27a6cfe4e149633fd1ea566" args="(const cmat &amp;x)" -->
180<a class="el" href="classitpp_1_1Mat.html#6fbac4b7184807da188e5b85d42f038b">cmat</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#g320dc9f6d27a6cfe4e149633fd1ea566">itpp::log</a> (const <a class="el" href="classitpp_1_1Mat.html#6fbac4b7184807da188e5b85d42f038b">cmat</a> &amp;x)</td></tr>
181
182<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">The natural logarithm of the elements. <br></td></tr>
183<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="gbaf1eabe626389b5a4aca26b6ef0d86f"></a><!-- doxytag: member="log_exp.h::log2" ref="gbaf1eabe626389b5a4aca26b6ef0d86f" args="(const vec &amp;x)" -->
184<a class="el" href="classitpp_1_1Vec.html#02e1bb55f60f3c2eb7a020eb1c2cfcf4">vec</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#gbaf1eabe626389b5a4aca26b6ef0d86f">itpp::log2</a> (const <a class="el" href="classitpp_1_1Vec.html#02e1bb55f60f3c2eb7a020eb1c2cfcf4">vec</a> &amp;x)</td></tr>
185
186<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">log-2 of the elements <br></td></tr>
187<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="gd50278d885a02a1448976186bb4ad5cd"></a><!-- doxytag: member="log_exp.h::log2" ref="gd50278d885a02a1448976186bb4ad5cd" args="(const mat &amp;x)" -->
188<a class="el" href="classitpp_1_1Mat.html#6bba394f181c76fda12759568986c613">mat</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#gd50278d885a02a1448976186bb4ad5cd">itpp::log2</a> (const <a class="el" href="classitpp_1_1Mat.html#6bba394f181c76fda12759568986c613">mat</a> &amp;x)</td></tr>
189
190<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">log-2 of the elements <br></td></tr>
191<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="gfc3c7f9e5088c92dff4b569bed1634a8"></a><!-- doxytag: member="log_exp.h::log10" ref="gfc3c7f9e5088c92dff4b569bed1634a8" args="(const vec &amp;x)" -->
192<a class="el" href="classitpp_1_1Vec.html#02e1bb55f60f3c2eb7a020eb1c2cfcf4">vec</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#gfc3c7f9e5088c92dff4b569bed1634a8">itpp::log10</a> (const <a class="el" href="classitpp_1_1Vec.html#02e1bb55f60f3c2eb7a020eb1c2cfcf4">vec</a> &amp;x)</td></tr>
193
194<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">log-10 of the elements <br></td></tr>
195<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="gd24b6c9440eaf8851f2a3173df42a19e"></a><!-- doxytag: member="log_exp.h::log10" ref="gd24b6c9440eaf8851f2a3173df42a19e" args="(const mat &amp;x)" -->
196<a class="el" href="classitpp_1_1Mat.html#6bba394f181c76fda12759568986c613">mat</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#gd24b6c9440eaf8851f2a3173df42a19e">itpp::log10</a> (const <a class="el" href="classitpp_1_1Mat.html#6bba394f181c76fda12759568986c613">mat</a> &amp;x)</td></tr>
197
198<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">log-10 of the elements <br></td></tr>
199<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="gd0b12b1902cf38b354520884ac18429e"></a><!-- doxytag: member="log_exp.h::logb" ref="gd0b12b1902cf38b354520884ac18429e" args="(double b, const vec &amp;x)" -->
200<a class="el" href="classitpp_1_1Vec.html#02e1bb55f60f3c2eb7a020eb1c2cfcf4">vec</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#gd0b12b1902cf38b354520884ac18429e">itpp::logb</a> (double b, const <a class="el" href="classitpp_1_1Vec.html#02e1bb55f60f3c2eb7a020eb1c2cfcf4">vec</a> &amp;x)</td></tr>
201
202<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">log-b of <code>x</code> <br></td></tr>
203<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="g913e6b2c337604c5ca8991c020a5ab80"></a><!-- doxytag: member="log_exp.h::logb" ref="g913e6b2c337604c5ca8991c020a5ab80" args="(double b, const mat &amp;x)" -->
204<a class="el" href="classitpp_1_1Mat.html#6bba394f181c76fda12759568986c613">mat</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#g913e6b2c337604c5ca8991c020a5ab80">itpp::logb</a> (double b, const <a class="el" href="classitpp_1_1Mat.html#6bba394f181c76fda12759568986c613">mat</a> &amp;x)</td></tr>
205
206<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">log-b of <code>x</code> <br></td></tr>
207<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="gf6a9b19ce9cb64c65199b3148b1b0469"></a><!-- doxytag: member="log_exp.h::dB" ref="gf6a9b19ce9cb64c65199b3148b1b0469" args="(const vec &amp;x)" -->
208<a class="el" href="classitpp_1_1Vec.html#02e1bb55f60f3c2eb7a020eb1c2cfcf4">vec</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#gf6a9b19ce9cb64c65199b3148b1b0469">itpp::dB</a> (const <a class="el" href="classitpp_1_1Vec.html#02e1bb55f60f3c2eb7a020eb1c2cfcf4">vec</a> &amp;x)</td></tr>
209
210<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Calculates 10*log10(x). <br></td></tr>
211<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="g03bd0214373c9505ef89b8886746e189"></a><!-- doxytag: member="log_exp.h::dB" ref="g03bd0214373c9505ef89b8886746e189" args="(const mat &amp;x)" -->
212<a class="el" href="classitpp_1_1Mat.html#6bba394f181c76fda12759568986c613">mat</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#g03bd0214373c9505ef89b8886746e189">itpp::dB</a> (const <a class="el" href="classitpp_1_1Mat.html#6bba394f181c76fda12759568986c613">mat</a> &amp;x)</td></tr>
213
214<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Calculates 10*log10(x). <br></td></tr>
215<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="g250b6ec368bc12844492285a7bb6ed94"></a><!-- doxytag: member="log_exp.h::inv_dB" ref="g250b6ec368bc12844492285a7bb6ed94" args="(const vec &amp;x)" -->
216<a class="el" href="classitpp_1_1Vec.html#02e1bb55f60f3c2eb7a020eb1c2cfcf4">vec</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#g250b6ec368bc12844492285a7bb6ed94">itpp::inv_dB</a> (const <a class="el" href="classitpp_1_1Vec.html#02e1bb55f60f3c2eb7a020eb1c2cfcf4">vec</a> &amp;x)</td></tr>
217
218<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Calulates the inverse of dB, 10^(x/10). <br></td></tr>
219<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="g5b4a5173187ffcd178523d63253bb312"></a><!-- doxytag: member="log_exp.h::inv_dB" ref="g5b4a5173187ffcd178523d63253bb312" args="(const mat &amp;x)" -->
220<a class="el" href="classitpp_1_1Mat.html#6bba394f181c76fda12759568986c613">mat</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#g5b4a5173187ffcd178523d63253bb312">itpp::inv_dB</a> (const <a class="el" href="classitpp_1_1Mat.html#6bba394f181c76fda12759568986c613">mat</a> &amp;x)</td></tr>
221
222<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Calculates the inverse of dB, 10^(x/10). <br></td></tr>
223<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="gdf1b40ed813a44d3ae68bbbae84b45c6"></a><!-- doxytag: member="log_exp.h::int2bits" ref="gdf1b40ed813a44d3ae68bbbae84b45c6" args="(const ivec &amp;v)" -->
224<a class="el" href="classitpp_1_1Vec.html#b03757d874926a9be91535e71af1656e">ivec</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#gdf1b40ed813a44d3ae68bbbae84b45c6">itpp::int2bits</a> (const <a class="el" href="classitpp_1_1Vec.html#b03757d874926a9be91535e71af1656e">ivec</a> &amp;v)</td></tr>
225
226<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Calculate the number of bits needed to represent each inteager in a vector. <br></td></tr>
227<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="g4a774bd5418520f574eddf730333dada"></a><!-- doxytag: member="log_exp.h::levels2bits" ref="g4a774bd5418520f574eddf730333dada" args="(const ivec &amp;v)" -->
228<a class="el" href="classitpp_1_1Vec.html#b03757d874926a9be91535e71af1656e">ivec</a>&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#g4a774bd5418520f574eddf730333dada">itpp::levels2bits</a> (const <a class="el" href="classitpp_1_1Vec.html#b03757d874926a9be91535e71af1656e">ivec</a> &amp;v)</td></tr>
229
230<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Calculate the number of bits needed to represent a numer of levels saved in a vector. <br></td></tr>
231<tr><td colspan="2"><br><h2>Variables</h2></td></tr>
232<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="g88c6cb15374a05289feecb35fdcd20f3"></a><!-- doxytag: member="log_exp.h::log_double_max" ref="g88c6cb15374a05289feecb35fdcd20f3" args="" -->
233const double&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#g88c6cb15374a05289feecb35fdcd20f3">itpp::log_double_max</a> = std::log(std::numeric_limits&lt;double&gt;::max())</td></tr>
234
235<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Constant definition to speed up <a class="el" href="group__logexpfunc.html#g02907e0ed7d04cde3a43e2a9d00c24c0" title="Truncated natural logarithm function.">trunc_log()</a> and <a class="el" href="group__logexpfunc.html#ga62c8362aeeb68ba0fc65c99267bd1fd" title="Truncated exponential function.">trunc_exp()</a>. <br></td></tr>
236<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="g7df3364a77d620d852c447b91dab2c77"></a><!-- doxytag: member="log_exp.h::log_double_min" ref="g7df3364a77d620d852c447b91dab2c77" args="" -->
237const double&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__logexpfunc.html#g7df3364a77d620d852c447b91dab2c77">itpp::log_double_min</a> = std::log(std::numeric_limits&lt;double&gt;::min())</td></tr>
238
239<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Constant definition to speed up <a class="el" href="group__logexpfunc.html#g02907e0ed7d04cde3a43e2a9d00c24c0" title="Truncated natural logarithm function.">trunc_log()</a>, <a class="el" href="group__logexpfunc.html#ga62c8362aeeb68ba0fc65c99267bd1fd" title="Truncated exponential function.">trunc_exp()</a> and <a class="el" href="group__logexpfunc.html#g1b295e7695ab2a3290bfadb26a149304" title="Safe substitute for log(exp(log_a) + exp(log_b)).">log_add()</a>. <br></td></tr>
240</table>
241<hr><a name="_details"></a><h2>Detailed Description</h2>
242Logarithmic and exponenential functions - header file.
243<p>
244<dl class="author" compact><dt><b>Author:</b></dt><dd>Tony Ottosson, Adam Piatyszek and Conrad Sanderson</dd></dl>
245-------------------------------------------------------------------------<p>
246Copyright (C) 1995-2008 (see AUTHORS file for a list of contributors)<p>
247This file is part of IT++ - a C++ library of mathematical, signal processing, speech processing, and communications classes and functions.<p>
248IT++ is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.<p>
249IT++ is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.<p>
250You should have received a copy of the GNU General Public License along with IT++. If not, see &lt;<a href="http://www.gnu.org/licenses/">http://www.gnu.org/licenses/</a>&gt;.<p>
251------------------------------------------------------------------------- </div>
252<hr size="1"><address style="text-align: right;"><small>Generated on Tue Jun 2 10:02:14 2009 for mixpp by&nbsp;
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