haedhar

Worldbuilders Probability

Dec 8th, 2015
115
Never
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  1. function compute(tickets) {
  2.     var Prob,nn,m,n,x;
  3.     nn=Math.floor(0); // because this is 0 ...
  4.     m=Math.floor(2054);
  5.     n=Math.floor(tickets);
  6.     x=Math.floor(0);
  7.     if ((n<=0)||(m<=0)||(nn<=0)) {
  8.         alert("Parameters must be positive integers");
  9.         Prob=0 // ... this is set to 0 ...
  10.     } else if ((m>nn)||(n>nn)) {
  11.         alert("m and n must be less than N");
  12.         Prob=0
  13.     } else if ((x<0)||(x<n+m-nn)) {Prob=0} else if ((x>=n)||(x>=m)) {Prob=1} else {
  14.         if (2*m>nn) {
  15.             if (2*n>nn) {Prob=hyp(nn-m-n+x,nn-n,nn-m,nn)} else {Prob=1-hyp(n-x-1,n,nn-m,nn)}
  16.         } else if (2*n>nn) {Prob=1-hyp(m-x-1,m,nn-n,nn)} else {Prob=hyp(x,n,m,nn)}
  17.     }
  18.     Prob=Math.round(Prob*100000)/100000; // ... which means this is 0 ...
  19.    
  20.     return {
  21.         probability: Prob,
  22.         percentage: (1 - Prob) * 100 // ... so this always works out to 100%    
  23.     }
  24. }
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