besseljzero

Function: besseljzero
Section: transcendental
C-Name: besseljzero
Prototype: GD1,L,b
Help: besseljzero(nu,{k=1}): k-th zero of the J-bessel function
 of index nu.
Doc: $k$-th zero of the $J$-Bessel function of index \var{nu}, close
 to $\pi(\nu/2 + k - 1/4)$.
 \bprog
 ? besseljzero(0) \\ @com{first zero of $J_0$}
 %1 = 2.4048255576957727686216318793264546431
 ? besselj(0, %)
 %2 = 7.1951595399463653939930598011247182898 E-41
 ? besseljzero(0, 2) \\ @com{second zero}
 %3 = 5.5200781102863106495966041128130274252
 ? besseljzero(I) \\ @com{first zero of $J_i$}
 %4 = 2.5377... + 1.4753...*I
 @eprog