MATLAB: Si=2*(roun​d(rand(1,s​bit))-1/2)​;

Question

 i am trying to generate a random signal with only +1 & -1 the code works the only problem that i donot under stand way we put the 2 and -1/2

Answer 1

a=rand% 
b=rand(a) % the result is 0 or 1

%If b=1

2*(1-1/2)=1

%If b=0

2*(0-1/2)=-1