25 Numerics library [numerics]

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

25.8.5 Mathematical special functions [sf.cmath]

25.8.5.2 Associated Legendre functions [sf.cmath.assoc_legendre]

double assoc_legendre(unsigned l, unsigned m, double x); float assoc_legendref(unsigned l, unsigned m, float x); long double assoc_legendrel(unsigned l, unsigned m, long double x);
Effects: These functions compute the associated Legendre functions of their respective arguments l, m, and x.
Returns:
where l is l, m is m, and x is x.
Remarks: The effect of calling each of these functions is implementation-defined if l >= 128.