select_feq.m

cognitive radio model programme with MATLAB

function [sys, x0, str, ts] = select_feq(t, x, u, flag)

switch flag,
    case 0 
        [sys,x0, str, ts] = mdlInitializeSizes;
    case 3
        sys = mdlOutputs(t,x,u);
    case {1,2,4,9}
        sys = [];
    otherwise
        error(['Unhandled flag = ', num2str(flag)]);
                
end;

function [sys, x0, str, ts] = mdlInitializeSizes
sizes = simsizes;
sizes.NumContStates = 0;
sizes.NumDiscStates = 0;
sizes.NumOutputs = 1;
sizes.NumInputs = 1;
sizes.DirFeedthrough = 1;
sizes.NumSampleTimes = 1;
sys = simsizes(sizes);
x0=[];
str=[];
ts=[-1,0];
function sys = mdlOutputs(t,x,u)

sys = cos(2*pi*u*t);