68 lines
1.6 KiB
Java
68 lines
1.6 KiB
Java
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public class Prob{
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static long TRIALS= 1000000;
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private static class Expv{
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public String name;
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public int probcount;
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public double expect;
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public double mapping;
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public Expv(String name, int probcount, double expect, double mapping){
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this.name= name;
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this.probcount= probcount;
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this.expect= expect;
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this.mapping= mapping;
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}
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}
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static Expv[] items=
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{new Expv("aleph", 0, 0.0, 0.0), new Expv("beth", 0, 0.0, 0.0),
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new Expv("gimel", 0, 0.0, 0.0),
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new Expv("daleth", 0, 0.0, 0.0),
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new Expv("he", 0, 0.0, 0.0), new Expv("waw", 0, 0.0, 0.0),
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new Expv("zayin", 0, 0.0, 0.0),
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new Expv("heth", 0, 0.0, 0.0)};
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public static void main(String[] args){
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int i, j;
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double rnum, tsum= 0.0;
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for(i= 0, rnum= 5.0;i < 7;i++, rnum+= 1.0){
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items[i].expect= 1.0 / rnum;
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tsum+= items[i].expect;
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}
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items[7].expect= 1.0 - tsum;
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items[0].mapping= 1.0 / 5.0;
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for(i= 1;i < 7;i++){
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items[i].mapping= items[i - 1].mapping + 1.0 / ((double)i + 5.0);
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}
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items[7].mapping= 1.0;
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for(i= 0;i < TRIALS;i++){
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rnum= Math.random();
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for(j= 0;j < 8;j++){
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if(rnum < items[j].mapping){
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items[j].probcount++;
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break;
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}
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}
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}
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System.out.printf("Trials: %d\n", TRIALS);
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System.out.printf("Items: ");
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for(i= 0;i < 8;i++)
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System.out.printf("%-8s ", items[i].name);
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System.out.printf("\nTarget prob.: ");
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for(i= 0;i < 8;i++)
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System.out.printf("%8.6f ", items[i].expect);
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System.out.printf("\nAttained prob.: ");
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for(i= 0;i < 8;i++)
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System.out.printf("%8.6f ", (double)(items[i].probcount)
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/ (double)TRIALS);
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System.out.printf("\n");
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}
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}
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