function [ret,x0,str,ts,xts]=COLAS_Nonlin(t,x,u,flag);
%COLAS_NONLIN is the M-file description of the SIMULINK system named COLAS_NONLIN.
% The block-diagram can be displayed by typing: COLAS_NONLIN.
%
% SYS=COLAS_NONLIN(T,X,U,FLAG) returns depending on FLAG certain
% system values given time...