Unit step function explanation

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

Answer 1

[Jim Riggs]

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.