15.2.5  Root mean square: rms

The rms command finds the room mean square of a list of numbers X=[x₁,x₂,…,x_n], which is defined by

• rms takes one argument:
  X, a list of real or complex numbers [x₁,x₂,…,x_n].
• rms(X) returns the root mean square of X.

Examples.

• Input:
  rms([1,2,5,8,3,6,7,9,-1])
  Output:

  √

  30

• Input:
  rms([1,1-i,2+3i,5-2i])
  Output:

  3 2

  √

  5