Some new GP features
zeros of Bessel functions
The functions besseljzero and besselyzero return the
n-th zero of the corresponding Bessel function:
? bz=besseljzero(Pi,1)
%58 = 6.5531024735734022070727271054828304261
? besselj(Pi,bz)
%59 = -5.9576642536872543212799829806359075922E-40
? bz=besselyzero(2,10)
%60 = 32.143002257627550524573578252532211033
? bessely(2,bz)
%61 = -1.9968602274696716479973132188802789421E-39