Julia

この投稿が面白かったので、Juliaの練習を兼ねてちょっと遊んで見る。
https://twitter.com/solove_math/status/1035480802144833536

==ここからコード==
using Plots

function func2(n)
      return [1.0/(2.0*Float64(n) - 1.0),-1.0/(4.0*Float64(n) - 2.0) ,-1.0/(4.0*Float64(n)) ]
end

function func1(n)
      return [1.0/(2.0*Float64(n) - 1.0),-1.0/(2.0*Float64(n) )]
end

function main()

   n = 60
   y = 0.0
   y2= 0.0
   arr_y = zeros(Float64,n, 2)
   #arr_x = zeros(Int64,n)
   arr_x = 1:n
   for i in 1:n/2
      y = func1(i)
      arr_y[2*Int64(i)-1,1]= y[1]
      arr_y[2*Int64(i)  ,1]= y[2]
   end
   for i in 1:n/3
      y = func2(i)
      arr_y[3*Int64(i)-2,2]= y[1]
      arr_y[3*Int64(i)-1,2]= y[2]
      arr_y[3*Int64(i)  ,2]= y[3]
   end
   for i in 2:n
      arr_y[i,1]= arr_y[i,1] + arr_y[i-1,1]
      arr_y[i,2]= arr_y[i,2] + arr_y[i-1,2]
   end

   plt = plot(arr_x,arr_y)
   gui(plt)
   readline()
end


main()
==ここまでコード==

NASA's servers with worldwindjava 1.5.1 on Linux

At least JDK-10.0.2 can communicate https servers of NASA, but older versions do not.
As far as I can see there are problems regarding SSL on older versions of JAVA.
If you are struggling with https connection, please try to use new versions.