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5.27.5  Root mean square: rms

rms takes one argument, a list X of real or complex numbers x1,x2,…,xn. The function returns the root mean square of X which is defined by

RMS(X)=
n
k=1
|xk|2
n

For example, input:

rms([1,2,5,8,3,6,7,9,-1])

Output:

sqrt(30)

Input:

rms([1,1-i,2+3i,5-2i])

Output:

3*sqrt(5)/2

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