stepfun.m

经典通信系统仿真书籍《通信系统与 MATLAB (Proakis)》源代码

function y = stepfun(t,to)
%STEPFUN  Unit step function.
%	STEPFUN(T,T0), where T is a monotonically increasing vector,
%	returns a vector the same length as T with zeros where T < T0
%	and ones where T >= T0.

%	J.N. Little 6-3-87
%	Copyright (c) 1986-93 by the MathWorks, Inc.

[m,n] = size(t);
y = zeros(m,n);
i = find(t>=to);
if isempty(i)
	return
end
i = i(1);
if m == 1
	y(i:n) = ones(1,n-i+1);
else
	y(i:m) = ones(m-i+1,1);
end