Function name: g2Test_univariate
Description:

The function does all the pairwise G^2 test of independence and gives the position inside the matrix. The user must build the associations matrix now, similarly to the correlation matrix. See the examples of how to do that. The p-value is not returned, we live this to the user. See the examples of how to obtain it.

Authors: Giorgos Borboudakis, John Burkardt and Manos Papadakis