apt install octave

Bsp.: Signal-Paket mit der Funktion rms (root mean square) → quadratischen Mittelwert.

apt install octave-signal

octave:1> P = [25 22 22 20 20 20 18 18 18 18 18 15 15 15 10];
octave:2> s = mean(P)
s = 18.267
octave:3> srms = rms(P)
error: 'rms' undefined near line 1, column 1

The 'rms' function belongs to the signal package from Octave Forge which
you have installed but not loaded.  To load the package, run 'pkg load
signal' from the Octave prompt.

Please read <https://www.octave.org/missing.html> to learn how you can
contribute missing functionality.
octave:4> pkg load signal

octave:5> srms = rms(P)
srms = 18.597