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std::log1p

From cppreference.com
< cpp‎ | numeric‎ | math
 
 
 
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Defined in header <cmath>
float       log1p( float arg );
(since C++11)
double      log1p( double arg );
(since C++11)
long double log1p( long double arg );
(since C++11)
double      log1p( Integral arg );
(since C++11)

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.

[edit] Parameters

arg - value of floating-point or Integral type

[edit] 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.

[edit] See also

computes natural (base e) logarithm (to base e) (ln(x))
(function) [edit]
(C++11)
returns e raised to the given power, minus one (ex-1)
(function) [edit]
computes common (base 10) logarithm (log10(x))
(function) [edit]
(C++11)
base 2 logarithm of the given number
(function) [edit]
C documentation for log1p