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Unit step function explanation

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Smit Patel
Smit Patel 2019-11-30
编辑： Jim Riggs 2019-11-30
function u = u(t)
u=double(t>=0);
end
Question: Why is this the function for unit step? and what does double mean? I know that it gives the unit step function of constant 1 after 0 but I don't know why. Can anyone please help?
Thanks

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Jim Riggs
Jim Riggs 2019-11-30
编辑：Jim Riggs 2019-11-30
Double is simply the data type , i.e. double precision.
(T>=0) is a logical 0 or 1.
double converts the answer to double precision.

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