GSL.jlの使い方（雑なメモ）
GSLの使い方 入力にポインターが必要なとき (sf_elljac_e) function gsl_ellipj ( ϕ , m ) sn , cn , dn = Cdouble [ 0 ] , Cdouble [ 0 ] , Cdouble [ 0 ] sf_elljac_e ( ϕ , m , sn , cn , dn ) return sn [ 1 ] , cn [ 1 ] , dn [ 1 ] end import Elliptic import GSL function ellipj_GSL ( ϕ , m ) sn , cn , dn = Cdouble [ 0 ] , Cdouble [ 0 ] , Cdouble [ 0 ] sf_elljac_e ( ϕ , m , sn , cn , dn ) return sn [ 1 ] , cn [ 1 ] , dn [ 1 ] end ellipj_Elliptic = Elliptic . ellipj ( ϕ , m ) ϕ , m = 0.672 , 0.36 result_Elliptic = elliptic_Elliptic ( ϕ , m ) @show result_Elliptic # 0.6095196917919022, 0.792770928653356, 0.9307281387786907 result_GSL = elliptic_GSL ( ϕ , m ) @show result_GSL # 0.6095196917919021, 0.792770928653356, 0.9307281387786907