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	<title>Computes the step response of a linear system</title>
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	<h1>Computes the step response of a linear system</h1>
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	<span class="keyword">function</span> X = simple_step(A,B,DT,N)
	n = size(A,1);
	Ad = expm( full( A * DT ) );
	Bd = ( Ad - eye(n) ) * B;
	Bd = A \ Bd;
	X = zeros(n,N);
	<span class="keyword">for</span> k = 2 : N,
	X(:,k) = Ad*X(:,k-1)+Bd;
	<span class="keyword">end</span>
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