Thank you Eric and Shaun for your answers to my question. We are looking for an application of geostatistical analysis allows us to simulate several categorical variables using the Gaussian method. But actually, as Shaun points out, there is apparently no GIS system that has implemented this algorithm, except MatLab. A colleague told me about the implementation of this algorithm with a software named SGeMS developed by Stanford University, but first I wanted to see the side of ESRI.
I come back to you on the details justifying the reason for the use of this algorithm.
thank you again.
Regards.