MathExpm1

Returns the value of the expression MathExp(x)-1.

double  MathExpm1(
   double  value      // power for the number e
   );

Parameters

value

[in] The number specifying the power.

Return Value

A value of the double type. In case of overflow the function returns INF (infinity), in case of underflow MathExpm1 returns 0.

Note

At values of x close to 0, the MathExpm1(x) function generates much more accurate values than the MathExp(x)-1 function.

Instead of the MathExpm1() function you can use the expm1() function.