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std::expm1

From cppreference.com
< cpp‎ | numeric‎ | math
 
 
 
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expm1
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Defined in header <cmath>
float       expm1( float arg );
(since C++11)
double      expm1( double arg );
(since C++11)
long double expm1( long double arg );
(since C++11)
double      expm1( Integral arg );
(since C++11)

Computes the e (Euler's number, 2.7182818) raised to the given power arg, minus 1. This function is more accurate than the expression std::exp(arg)-1 if arg is close to zero.

[edit] Parameters

arg - value of floating-point or Integral type

[edit] Return value

earg
-1

If the result is too large for the underlying type, range error occurs and HUGE_VAL is returned.

[edit] See also

returns e raised to the given power (ex)
(function) [edit]
(C++11)
natural logarithm (to base e) of 1 plus the given number
(function) [edit]
(C++11)
returns 2 raised to the given power (2x)
(function) [edit]
C documentation for expm1