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std::log1p

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Template:ddcl list begin <tr class="t-dsc-header">

<td>
Defined in header <cmath>
</td>

<td></td> <td></td> <tr class="t-dcl ">

<td >
float       log1p( float arg );
</td>

<td class="t-dcl-nopad"> </td> <td > (since C++11) </td> </tr> <tr class="t-dcl ">

<td >
double      log1p( double arg );
</td>

<td class="t-dcl-nopad"> </td> <td > (since C++11) </td> </tr> <tr class="t-dcl ">

<td >
long double log1p( long double arg );
</td>

<td class="t-dcl-nopad"> </td> <td > (since C++11) </td> </tr> <tr class="t-dcl ">

<td >
double      log1p( Integral arg );
</td>

<td class="t-dcl-nopad"> </td> <td > (since C++11) </td> </tr> Template:ddcl list end

Computes the natural (base e) logarithm of 1+arg. This function is more precise than the expression std::log(1+arg) if arg is close to zero.

Parameters

arg - floating point value

Return value

ln(1+arg)

Domain error occurs if arg is less than -1. NAN is returned in that case.

Range error occurs if arg is -1. -HUGE_VAL is returned in that case.

See also

Template:cpp/numeric/math/dcl list logTemplate:cpp/numeric/math/dcl list expm1Template:cpp/numeric/math/dcl list log10Template:cpp/numeric/math/dcl list log2