[sf.cmath.expint] (original) (raw)

29 Numerics library [numerics]

29.7 Mathematical functions for floating-point types [c.math]

29.7.6 Mathematical special functions [sf.cmath]

29.7.6.15 Exponential integral [sf.cmath.expint]

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_floating-point-type_ expint(_floating-point-type_ x);float expintf(float x);long double expintl(long double x);

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Effects: These functions compute the exponential integral of their respective argumentsx.

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Returns: Ei(x), where Ei is given by Formula 29.35 andx is x.