36 lines
657 B
V
36 lines
657 B
V
import rand
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import math
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fn main() {
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sample(100)
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sample(1000)
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sample(10000)
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}
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fn sample(n int) {
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// generate data
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mut d := []f64{len: n}
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for i in 0.. d.len {
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d[i] = rand.f64()
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}
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// show mean, standard deviation
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mut sum, mut ssq := f64(0), f64(0)
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for s in d {
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sum += s
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ssq += s * s
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}
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println("$n numbers")
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m := sum / f64(n)
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println("Mean: $m")
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println("Stddev: ${math.sqrt(ssq/f64(n)-m*m)}")
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// show histogram
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mut h := []int{len: 10}
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for s in d {
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h[int(s*10)]++
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}
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for c in h {
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println("*".repeat(c*205/int(n)))
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}
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println('')
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}
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