The function calculates the products among arrays.
prod3(m, a1, a2, a3)The three-way contingency table weighted with respect the suitable weight matrices (depending on the analysis variants).
The original three-way contingency table.
The weight matrix related to the rows of the table.
The weight matrix related to the columns of the table.
The weight matrix related to the tubes of the table.
Rosaria Lombardo, Eric J Beh, Ida Camminatiello.
It is utilised in standtab, rstand3 and rstand3delta in order to weight the
contingency table with respect to the three weigth matrices defined in the row, column and tube spaces
differently for the three variants of three-way correspondence analysis.