The file contains: The R-code: (1) To generate a small random interaction matrix. (2) To generare the parameterization of intrinsic growth rates corresponding to the random interaction matrix. This vector of intrinsic growth rates can be generated either randomly with no other constraints, all elements with the same value, randomly inside the feasibility domain, or the vector that corresponds to the geometric centroid of the feasibility domain. (3) To check whether the community with the given random interaction matrix and chosen parameterization is feasible and stable. All the functions are written in toolbox.R and we provide a simple example.R to illustrate their application.