js/src/t/math-partial-sums.js

   1 // The Computer Language Shootout
   2 // http://shootout.alioth.debian.org/
   3 // contributed by Isaac Gouy
   4
   5 function partial(n){
   6     var a1 = a2 = a3 = a4 = a5 = a6 = a7 = a8 = a9 = 0.0;
   7     var twothirds = 2.0/3.0;
   8     var alt = -1.0;
   9     var k2 = k3 = sk = ck = 0.0;
  10
  11     for (var k = 1; k <= n; k++){
  12         k2 = k*k;
  13         k3 = k2*k;
  14         sk = Math.sin(k);
  15         ck = Math.cos(k);
  16         alt = -alt;
  17
  18         a1 += Math.pow(twothirds,k-1);
  19         a2 += Math.pow(k,-0.5);
  20         a3 += 1.0/(k*(k+1.0));
  21         a4 += 1.0/(k3 * sk*sk);
  22         a5 += 1.0/(k3 * ck*ck);
  23         a6 += 1.0/k;
  24         a7 += 1.0/k2;
  25         a8 += alt/k;
  26         a9 += alt/(2*k -1);
  27     }
  28 }
  29
  30 for (var i = 1024; i <= 16384; i *= 2) {
  31     partial(i);
  32 }
  33