Difference between revisions of "cpp/numeric/math/log1p"

Revision as of 20:26, 19 April 2012

<td>

Defined in header <cmath>

</td>

<td >

float log1p( float arg );

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

<td >

double log1p( double arg );

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

<td >

long double log1p( long double arg );

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

<td >

double log1p( Integral arg );

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<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.

arg

-

floating point value

$ln(1+arg)$

Domain error occurs if arg is negative. NAN is returned in that case.

Range error occurs if arg is 0. -HUGE_VAL is returned in that case.

@@ Line 17: / Line 17: @@
 {{ddcl list end}}
-Computes the natural (base {{cpp|e}}) logarithm of {{cpp|1+arg}}. This function is more precise than the expression {{cpp|std::log(1+arg)}} if {{tt|arg}} is close to zero.
+Computes the natural (base {{c|e}}) logarithm of {{c|1+arg}}. This function is more precise than the expression {{c|std::log(1+arg)}} if {{tt|arg}} is close to zero.
 ===Parameters===
@@ Line 28: / Line 28: @@
 {{math|ln(1+arg)}}
-Domain error occurs if {{tt|arg}} is negative. {{cpp|NAN}} is returned in that case.
+Domain error occurs if {{tt|arg}} is negative. {{c|NAN}} is returned in that case.
-Range error occurs if {{tt|arg}} is {{cpp|0}}. {{cpp|-HUGE_VAL}} is returned in that case.
+Range error occurs if {{tt|arg}} is {{c|0}}. {{c|-HUGE_VAL}} is returned in that case.
 ===See also===