I need code for discretize a tf with "Integral forward"

2012 3 7
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I did this function and work fine...
function [sys] = adelante(sys, T)
z = tf('z');
T = input('Tiempo de Muestreo: ');
s = (T*z)/(z-1);
FuncT = input('Ingrese la funcion de transferencia: ');
sys = FuncT;
end
but when I do this doesn't works
close all
clear all
clc
syms s
Gs = (303*s + 463.9)/(s^2 + 508.7*s + 779.9);
Ep = double(limit((1/(1+Gs)),s,0))
T = 0.001;
adelante(Gs,T)
and the function
function [sysd] = adelante(sys,T)
z = tf('z',T)
s = (T*z)/(z-1)
sysd = FuncT;
end

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Sergio
Sergio
2012-3-7

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