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legndr
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legndr(l,m, x)
return the associated Legendre function Plm(x). The X may
be an array (-1<=x<=1), but L and M (0<=M<=L) must be scalar
values. For m=0, these are the Legendre polynomials Pl(x).
Relation of Plm(x) to Pl(x):
Plm(x) = (-1)^m (1-x^2)^(m/2) d^m/dx^m(Pl(x))
Relation of Plm(x) to spherical harmonics Ylm:
Ylm(theta,phi)= sqrt((2*l+1)(l-m)!/(4*pi*(l+m)!)) *
Plm(cos(theta)) * exp(1i*m*phi)
interpreted function, defined at i/legndr.i line 12
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