Function libm::expm1

source ยท
pub fn expm1(x: f64) -> f64
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Exponential, base e, of x-1 (f64)

Calculates the exponential of x and subtract 1, that is, e raised to the power x minus 1 (where e is the base of the natural system of logarithms, approximately 2.71828). The result is accurate even for small values of x, where using exp(x)-1 would lose many significant digits.