27 lines
524 B
Plaintext
27 lines
524 B
Plaintext
func generate_statistics(n) {
|
|
var(sum=0, sum2=0);
|
|
var hist = 10.of(0);
|
|
|
|
n.times {
|
|
var r = 1.rand;
|
|
sum += r;
|
|
sum2 += r**2;
|
|
hist[10*r] += 1;
|
|
}
|
|
|
|
var mean = sum/n;
|
|
var stddev = Math.sqrt(sum2/n - mean**2);
|
|
|
|
say "size: #{n}";
|
|
say "mean: #{mean}";
|
|
say "stddev: #{stddev}";
|
|
|
|
var max = hist.max;
|
|
hist.range.each {|i|
|
|
printf("%.1f:%s\n", 0.1*i, "=" * 70*hist[i]/max);
|
|
}
|
|
print "\n";
|
|
}
|
|
|
|
[100, 1000, 10000].each {|n| generate_statistics(n) }
|