www.pudn.com > qpsk-simulink.rar > Signum.m

function y=signum(x) 
%SIGNUM	finds the signum of a vector. 
%	Y=SIGNUM(X) 
%	X=input vector 
 
y=x; 
y(find(x>0))=ones(size(find(x>0))); 
y(find(x<0))=-ones(size(find(x<0))); 
y(find(x==0))=zeros(size(find(x==0)));