Numerical simulation of non-Gaussian random fields with prescribed correlation structure

In this paper we will consider the problem of the numerical simulation of n on-Gaussian, scalar random fields with a prescribed correlation structure e ither provided by a theoretical model or computed on a set of observational data. Although the numerical generation of a generic, non-Gaussian random field is a trivial operation, the task becomes difficult when the field is constrained with a prescribed correlation structure. In this regard, three numerical methods, useful for astronomical applications, are presented. The limits and capabilities of each method are discussed, and the pseudocodes describing the numerical implementation are provided for two of them.