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std::expm1

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Defined in header <cmath>
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<td >
float       expm1( float arg );
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<td class="t-dcl-nopad"> </td> <td > (since C++11) </td> </tr> <tr class="t-dcl-sep"><td></td><td></td><td></td></tr>

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<td >
double      expm1( double arg );
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<td >
long double expm1( long double arg );
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<td >
double      expm1( Integral arg );
</td>

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

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.

Parameters

arg - floating point value

Return value

earg
-1

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

See also

Template:cpp/numeric/math/dcl list expTemplate:cpp/numeric/math/dcl list log1pTemplate:cpp/numeric/math/dcl list exp2