O()

function out=O(in)

Input:

• in: $N_s$ sets of $d=3$ dimensional data, stored as an $\prod S_k\,\times\,N_s$ matrix

Global variables:

• gbl_S: dimensions of $d=3$ dimensional data sets

Output:

• out: O operator applied to in

Actually, because the action of O() is simply multiplication by a constant, an operation already defined properly in octave for matrices, your software for O() should probably function fine ``as is''.