varp

varp(X)

X is a vector/matrix.

If X is a vector, return the population variance of X.

If X is a matrix, ccalculate the population variance of each column and return a vector.

As with all other aggregate functions, NULL values are ignored in the calculation.

varp(1 1 1);
// output
0
varp(1 2 3);
// output
0.666667

m=matrix(1 3 5 7 9, 1 4 7 10 13);
m;
// output
#0  #1
1   1
3   4
5   7
7   10
9   13
varp(m);
// output
[8,18]