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<?xml version='1.0'?>
<html xmlns='http://www.w3.org/1999/xhtml'
      xmlns:math='http://www.w3.org/1998/Math/MathML'
>
<head>
<title>Base Type Requirements for Standard Math Functions</title>
<meta http-equiv='Content-Type' content='text/html' charset='utf-8'/>
<meta name="description" id="description" content="Base Type Requirements for Standard Math Functions"/>
<meta name="keywords" id="keywords" content=" base type requirements for standard math functions require purpose unary cppad_standard_math_unary Cppad_standard_math_unary erf sign pow isnan limits numeric Base numeric_limits epsilon "/>
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body { color : black }
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<body>
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<center><b><big><big>Base Type Requirements for Standard Math Functions</big></big></b></center>
<br/>
<b><big><a name="Purpose" id="Purpose">Purpose</a></big></b>
<br/>
These definitions are required for the user's code to use the type

<code><font color="blue"><span style='white-space: nowrap'>AD&lt;</span></font><i><font color="black"><span style='white-space: nowrap'>Base</span></font></i><font color="blue"><span style='white-space: nowrap'>&gt;</span></font></code>
:

<br/>
<br/>
<b><big><a name="Unary Standard Math" id="Unary Standard Math">Unary Standard Math</a></big></b>
 


<br/>
The type 
<code><i><font color="black"><span style='white-space: nowrap'>Base</span></font></i></code>
 must support the following functions
unary standard math functions (in the CppAD namespace):
<table><tr><td align='left'  valign='top'>

<b>Syntax</b> </td><td align='left'  valign='top'>
 <b>Result</b> 
</td></tr><tr><td align='left'  valign='top'>


<code><i><font color="black"><span style='white-space: nowrap'>y</span></font></i><font color="blue"><span style='white-space: nowrap'>&#xA0;=&#xA0;abs(</span></font><i><font color="black"><span style='white-space: nowrap'>x</span></font></i><font color="blue"><span style='white-space: nowrap'>)</span></font></code>
  </td><td align='left'  valign='top'>
 absolute value     </td></tr><tr><td align='left'  valign='top'>


<code><i><font color="black"><span style='white-space: nowrap'>y</span></font></i><font color="blue"><span style='white-space: nowrap'>&#xA0;=&#xA0;acos(</span></font><i><font color="black"><span style='white-space: nowrap'>x</span></font></i><font color="blue"><span style='white-space: nowrap'>)</span></font></code>
 </td><td align='left'  valign='top'>
 inverse cosine     </td></tr><tr><td align='left'  valign='top'>


<code><i><font color="black"><span style='white-space: nowrap'>y</span></font></i><font color="blue"><span style='white-space: nowrap'>&#xA0;=&#xA0;asin(</span></font><i><font color="black"><span style='white-space: nowrap'>x</span></font></i><font color="blue"><span style='white-space: nowrap'>)</span></font></code>
 </td><td align='left'  valign='top'>
 inverse sine       </td></tr><tr><td align='left'  valign='top'>


<code><i><font color="black"><span style='white-space: nowrap'>y</span></font></i><font color="blue"><span style='white-space: nowrap'>&#xA0;=&#xA0;atan(</span></font><i><font color="black"><span style='white-space: nowrap'>x</span></font></i><font color="blue"><span style='white-space: nowrap'>)</span></font></code>
 </td><td align='left'  valign='top'>
 inverse tangent    </td></tr><tr><td align='left'  valign='top'>


<code><i><font color="black"><span style='white-space: nowrap'>y</span></font></i><font color="blue"><span style='white-space: nowrap'>&#xA0;=&#xA0;cos(</span></font><i><font color="black"><span style='white-space: nowrap'>x</span></font></i><font color="blue"><span style='white-space: nowrap'>)</span></font></code>
  </td><td align='left'  valign='top'>
 cosine             </td></tr><tr><td align='left'  valign='top'>


<code><i><font color="black"><span style='white-space: nowrap'>y</span></font></i><font color="blue"><span style='white-space: nowrap'>&#xA0;=&#xA0;cosh(</span></font><i><font color="black"><span style='white-space: nowrap'>x</span></font></i><font color="blue"><span style='white-space: nowrap'>)</span></font></code>
 </td><td align='left'  valign='top'>
 hyperbolic cosine  </td></tr><tr><td align='left'  valign='top'>


<code><i><font color="black"><span style='white-space: nowrap'>y</span></font></i><font color="blue"><span style='white-space: nowrap'>&#xA0;=&#xA0;exp(</span></font><i><font color="black"><span style='white-space: nowrap'>x</span></font></i><font color="blue"><span style='white-space: nowrap'>)</span></font></code>
  </td><td align='left'  valign='top'>
 exponential        </td></tr><tr><td align='left'  valign='top'>


<code><i><font color="black"><span style='white-space: nowrap'>y</span></font></i><font color="blue"><span style='white-space: nowrap'>&#xA0;=&#xA0;fabs(</span></font><i><font color="black"><span style='white-space: nowrap'>x</span></font></i><font color="blue"><span style='white-space: nowrap'>)</span></font></code>
 </td><td align='left'  valign='top'>
 absolute value     </td></tr><tr><td align='left'  valign='top'>


<code><i><font color="black"><span style='white-space: nowrap'>y</span></font></i><font color="blue"><span style='white-space: nowrap'>&#xA0;=&#xA0;log(</span></font><i><font color="black"><span style='white-space: nowrap'>x</span></font></i><font color="blue"><span style='white-space: nowrap'>)</span></font></code>
  </td><td align='left'  valign='top'>
 natural logarithm  </td></tr><tr><td align='left'  valign='top'>


<code><i><font color="black"><span style='white-space: nowrap'>y</span></font></i><font color="blue"><span style='white-space: nowrap'>&#xA0;=&#xA0;sin(</span></font><i><font color="black"><span style='white-space: nowrap'>x</span></font></i><font color="blue"><span style='white-space: nowrap'>)</span></font></code>
  </td><td align='left'  valign='top'>
 sine               </td></tr><tr><td align='left'  valign='top'>


<code><i><font color="black"><span style='white-space: nowrap'>y</span></font></i><font color="blue"><span style='white-space: nowrap'>&#xA0;=&#xA0;sinh(</span></font><i><font color="black"><span style='white-space: nowrap'>x</span></font></i><font color="blue"><span style='white-space: nowrap'>)</span></font></code>
 </td><td align='left'  valign='top'>
 hyperbolic sine    </td></tr><tr><td align='left'  valign='top'>


<code><i><font color="black"><span style='white-space: nowrap'>y</span></font></i><font color="blue"><span style='white-space: nowrap'>&#xA0;=&#xA0;sqrt(</span></font><i><font color="black"><span style='white-space: nowrap'>x</span></font></i><font color="blue"><span style='white-space: nowrap'>)</span></font></code>
 </td><td align='left'  valign='top'>
 square root        </td></tr><tr><td align='left'  valign='top'>


<code><i><font color="black"><span style='white-space: nowrap'>y</span></font></i><font color="blue"><span style='white-space: nowrap'>&#xA0;=&#xA0;tan(</span></font><i><font color="black"><span style='white-space: nowrap'>x</span></font></i><font color="blue"><span style='white-space: nowrap'>)</span></font></code>
  </td><td align='left'  valign='top'>
 tangent           
</td></tr>
</table>
where the arguments and return value have the prototypes

<code><font color="blue"><span style='white-space: nowrap'><br/>
&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;const&#xA0;</span></font><i><font color="black"><span style='white-space: nowrap'>Base</span></font></i><font color="blue"><span style='white-space: nowrap'>&amp;&#xA0;</span></font><i><font color="black"><span style='white-space: nowrap'>x</span></font></i><font color="blue"><span style='white-space: nowrap'><br/>
&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;</span></font><i><font color="black"><span style='white-space: nowrap'>Base</span></font></i><font color="blue"><span style='white-space: nowrap'>&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;</span></font><i><font color="black"><span style='white-space: nowrap'>y</span></font></i><font color="blue"><span style='white-space: nowrap'><br/>
</span></font></code>
For example,
<a href="base_alloc.hpp.xml#Unary Standard Math" target="_top"><span style='white-space: nowrap'>base_alloc</span></a>
,


<br/>
<br/>
<b><big><a name="CPPAD_STANDARD_MATH_UNARY" id="CPPAD_STANDARD_MATH_UNARY">CPPAD_STANDARD_MATH_UNARY</a></big></b>

<br/>
The macro invocation, within the CppAD namespace,

<code><font color="blue"><span style='white-space: nowrap'><br/>
&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;CPPAD_STANDARD_MATH_UNARY(</span></font><i><font color="black"><span style='white-space: nowrap'>Base</span></font></i><font color="blue"><span style='white-space: nowrap'>,&#xA0;</span></font><i><font color="black"><span style='white-space: nowrap'>Fun</span></font></i><font color="blue"><span style='white-space: nowrap'>)<br/>
</span></font></code>
defines the syntax

<code><font color="blue"><span style='white-space: nowrap'><br/>
&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;</span></font><i><font color="black"><span style='white-space: nowrap'>y</span></font></i><font color="blue"><span style='white-space: nowrap'>&#xA0;=&#xA0;CppAD::</span></font><i><font color="black"><span style='white-space: nowrap'>Fun</span></font></i><font color="blue"><span style='white-space: nowrap'>(</span></font><i><font color="black"><span style='white-space: nowrap'>x</span></font></i><font color="blue"><span style='white-space: nowrap'>)<br/>
</span></font></code>
This macro uses the functions 
<code><font color="blue"><span style='white-space: nowrap'>std::</span></font><i><font color="black"><span style='white-space: nowrap'>Fun</span></font></i></code>
 which
must be defined and have the same prototype as 
<code><font color="blue"><span style='white-space: nowrap'>CppAD::</span></font><i><font color="black"><span style='white-space: nowrap'>Fun</span></font></i></code>
.
For example, 
<a href="base_float.hpp.xml#Unary Standard Math" target="_top"><span style='white-space: nowrap'>float</span></a>
.

<br/>
<br/>
<b><big><a name="erf" id="erf">erf</a></big></b>



<br/>
If the error function is supported by the compiler,
<a href="erf.xml#Method.CPPAD_COMPILER_HAS_ERF" target="_top"><span style='white-space: nowrap'>CPPAD_COMPILER_HAS_ERF</span></a>

is one,
the type 
<code><i><font color="black"><span style='white-space: nowrap'>Base</span></font></i></code>
 must support the syntax

<code><font color="blue"><span style='white-space: nowrap'><br/>
&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;</span></font><i><font color="black"><span style='white-space: nowrap'>y</span></font></i><font color="blue"><span style='white-space: nowrap'>&#xA0;=&#xA0;CppAD::erf(</span></font><i><font color="black"><span style='white-space: nowrap'>x</span></font></i><font color="blue"><span style='white-space: nowrap'>)<br/>
</span></font></code>
where 
<code><i><font color="black"><span style='white-space: nowrap'>x</span></font></i></code>
 and 
<code><i><font color="black"><span style='white-space: nowrap'>y</span></font></i></code>
 have the same prototype as above.
For example, see
<a href="base_alloc.hpp.xml#erf" target="_top"><span style='white-space: nowrap'>base_alloc</span></a>
.

<br/>
<br/>
<b><big><a name="sign" id="sign">sign</a></big></b>



<br/>
The type 
<code><i><font color="black"><span style='white-space: nowrap'>Base</span></font></i></code>
 must support the syntax

<code><font color="blue"><span style='white-space: nowrap'><br/>
&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;</span></font><i><font color="black"><span style='white-space: nowrap'>y</span></font></i><font color="blue"><span style='white-space: nowrap'>&#xA0;=&#xA0;CppAD::sign(</span></font><i><font color="black"><span style='white-space: nowrap'>x</span></font></i><font color="blue"><span style='white-space: nowrap'>)<br/>
</span></font></code>
which computes

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block"><mrow>
<mi mathvariant='italic'>y</mi>
<mo stretchy="false">=</mo>
<mrow><mo stretchy="true">{</mo><mrow><mtable rowalign="center" ><mtr><mtd columnalign="left" >
<mo stretchy="false">+</mo>
<mn>1</mn>
</mtd><mtd columnalign="left" >
<mrow><mstyle mathvariant='normal'><mi mathvariant='normal'>if</mi>
</mstyle></mrow>
<mspace width='.3em'/>
<mi mathvariant='italic'>x</mi>
<mo stretchy="false">&gt;</mo>
<mn>0</mn>
</mtd></mtr><mtr><mtd columnalign="left" >
<mn>0</mn>
</mtd><mtd columnalign="left" >
<mrow><mstyle mathvariant='normal'><mi mathvariant='normal'>if</mi>
</mstyle></mrow>
<mspace width='.3em'/>
<mi mathvariant='italic'>x</mi>
<mo stretchy="false">=</mo>
<mn>0</mn>
</mtd></mtr><mtr><mtd columnalign="left" >
<mn>-1</mn>
</mtd><mtd columnalign="left" >
<mrow><mstyle mathvariant='normal'><mi mathvariant='normal'>if</mi>
</mstyle></mrow>
<mspace width='.3em'/>
<mi mathvariant='italic'>x</mi>
<mo stretchy="false">&lt;</mo>
<mn>0</mn>
</mtd></mtr></mtable>
</mrow><mo stretchy="true"> </mo></mrow>
</mrow></math>

where 
<code><i><font color="black"><span style='white-space: nowrap'>x</span></font></i></code>
 and 
<code><i><font color="black"><span style='white-space: nowrap'>y</span></font></i></code>
 have the same prototype as above.
For example, see
<a href="base_alloc.hpp.xml#sign" target="_top"><span style='white-space: nowrap'>base_alloc</span></a>
.
Note that, if ordered comparisons are not defined for the type 
<code><i><font color="black"><span style='white-space: nowrap'>Base</span></font></i></code>
,
the <code><font color="blue">code sign</font></code> function should generate an assert if it is used; see
<a href="base_complex.hpp.xml#Invalid Unary Math" target="_top"><span style='white-space: nowrap'>complex&#xA0;invalid&#xA0;unary&#xA0;math</span></a>
.

<br/>
<br/>
<b><big><a name="pow" id="pow">pow</a></big></b>



<br/>
The type 
<code><i><font color="black"><span style='white-space: nowrap'>Base</span></font></i></code>
 must support the syntax

<code><font color="blue"><span style='white-space: nowrap'><br/>
&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;</span></font><i><font color="black"><span style='white-space: nowrap'>z</span></font></i><font color="blue"><span style='white-space: nowrap'>&#xA0;=&#xA0;CppAD::pow(</span></font><i><font color="black"><span style='white-space: nowrap'>x</span></font></i><font color="blue"><span style='white-space: nowrap'>,&#xA0;</span></font><i><font color="black"><span style='white-space: nowrap'>y</span></font></i><font color="blue"><span style='white-space: nowrap'>)<br/>
</span></font></code>
which computes 
<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow>
<mi mathvariant='italic'>z</mi>
<mo stretchy="false">=</mo>
<msup><mi mathvariant='italic'>x</mi>
<mi mathvariant='italic'>y</mi>
</msup>
</mrow></math>

.
The arguments 
<code><i><font color="black"><span style='white-space: nowrap'>x</span></font></i></code>
 and 
<code><i><font color="black"><span style='white-space: nowrap'>y</span></font></i></code>
 have prototypes

<code><font color="blue"><span style='white-space: nowrap'><br/>
&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;const&#xA0;</span></font><i><font color="black"><span style='white-space: nowrap'>Base</span></font></i><font color="blue"><span style='white-space: nowrap'>&amp;&#xA0;</span></font><i><font color="black"><span style='white-space: nowrap'>x</span></font></i><font color="blue"><span style='white-space: nowrap'><br/>
&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;const&#xA0;</span></font><i><font color="black"><span style='white-space: nowrap'>Base</span></font></i><font color="blue"><span style='white-space: nowrap'>&amp;&#xA0;</span></font><i><font color="black"><span style='white-space: nowrap'>y</span></font></i><font color="blue"><span style='white-space: nowrap'><br/>
</span></font></code>
and the return value 
<code><i><font color="black"><span style='white-space: nowrap'>z</span></font></i></code>
 has prototype

<code><font color="blue"><span style='white-space: nowrap'><br/>
&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;</span></font><i><font color="black"><span style='white-space: nowrap'>Base</span></font></i><font color="blue"><span style='white-space: nowrap'>&#xA0;</span></font><i><font color="black"><span style='white-space: nowrap'>z</span></font></i><font color="blue"><span style='white-space: nowrap'><br/>
</span></font></code>
For example, see
<a href="base_alloc.hpp.xml#pow" target="_top"><span style='white-space: nowrap'>base_alloc</span></a>
.


<br/>
<br/>
<b><big><a name="isnan" id="isnan">isnan</a></big></b>


<br/>
If 
<code><i><font color="black"><span style='white-space: nowrap'>Base</span></font></i></code>
 defines the <code><font color="blue">isnan</font></code> function,
you may also have to provide a definition in the CppAD namespace
(to avoid a function ambiguity).
For example, see
<a href="base_complex.hpp.xml#isnan" target="_top"><span style='white-space: nowrap'>base_complex</span></a>
.


<br/>
<br/>
<b><big><a name="limits" id="limits">limits</a></big></b>



<br/>
The <a href="limits.xml" target="_top"><span style='white-space: nowrap'>numeric_limits</span></a>
 functions

<code><font color="blue"><span style='white-space: nowrap'><br/>
&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;</span></font><i><font color="black"><span style='white-space: nowrap'>Base</span></font></i><font color="blue"><span style='white-space: nowrap'>&#xA0;CppAD::numeric_limits&lt;</span></font><i><font color="black"><span style='white-space: nowrap'>Base</span></font></i><font color="blue"><span style='white-space: nowrap'>&gt;::epsilon()<br/>
&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;</span></font><i><font color="black"><span style='white-space: nowrap'>Base</span></font></i><font color="blue"><span style='white-space: nowrap'>&#xA0;CppAD::numeric_limits&lt;</span></font><i><font color="black"><span style='white-space: nowrap'>Base</span></font></i><font color="blue"><span style='white-space: nowrap'>&gt;::min()<br/>
&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;</span></font><i><font color="black"><span style='white-space: nowrap'>Base</span></font></i><font color="blue"><span style='white-space: nowrap'>&#xA0;CppAD::numeric_limits&lt;</span></font><i><font color="black"><span style='white-space: nowrap'>Base</span></font></i><font color="blue"><span style='white-space: nowrap'>&gt;::max()<br/>
</span></font></code>
must return machine epsilon,
minimum positive normalize value,
and maximum finite value for the type 
<code><i><font color="black"><span style='white-space: nowrap'>Base</span></font></i></code>
.

<br/>
<br/>
<b><a name="limits.epsilon" id="limits.epsilon">epsilon</a></b>
<br/>
The deprecated function <a href="epsilon.xml" target="_top"><span style='white-space: nowrap'>epsilon</span></a>
 function
must also be included. It can be implemented using

<code><font color="blue"><span style='white-space: nowrap'><br/>
namespace&#xA0;CppAD&#xA0;{<br/>
&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;template&#xA0;&lt;&gt;&#xA0;inline&#xA0;</span></font><i><font color="black"><span style='white-space: nowrap'>Base</span></font></i><font color="blue"><span style='white-space: nowrap'>&#xA0;epsilon&lt;</span></font><i><font color="black"><span style='white-space: nowrap'>Base</span></font></i><font color="blue"><span style='white-space: nowrap'>&gt;(void)<br/>
&#xA0;&#xA0;&#xA0;&#xA0;&#xA0;{&#xA0;&#xA0;&#xA0;&#xA0;return&#xA0;numeric_limits&lt;</span></font><i><font color="black"><span style='white-space: nowrap'>Base</span></font></i><font color="blue"><span style='white-space: nowrap'>&gt;::epsilon();&#xA0;}<br/>
}<br/>
</span></font></code>

<hr/>Input File: cppad/local/base_std_math.hpp

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