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#!/usr/bin/awk -f
BEGIN {
min = 10000000
}
{
val = $1
if (val < min)
min = val
if (val > max)
max = val
delta = val - mean
mean += delta / NR
v += delta * (val - mean)
# percentiles
array[NR] = val
}
END {
if (NR > 1)
v = v/(NR-1)
else
v = 0
qsort(array, 1, NR)
p50 = int(NR / 2)
p90 = int(NR * 0.9)
p95 = int(NR * 0.95)
p99 = int(NR * 0.99)
print mean " min/p50/90/95/99/max/std = " min " / " array[p50] " / " array[p90] " / " array[p95] " / " array[p99] " / " max " / " sqrt(v) " n=" NR
}
function qsort(A, left, right, i, last) {
if (left >= right)
return
swap(A, left, left+int((right-left+1)*rand()))
last = left
for (i = left+1; i <= right; i++)
if (A[i] < A[left])
swap(A, ++last, i)
swap(A, left, last)
qsort(A, left, last-1)
qsort(A, last+1, right)
}
function swap(A, i, j, t) {
t = A[i]; A[i] = A[j]; A[j] = t
}
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