function z=saw(t)
 
% The function SAW generates a saw tooth function.
%
% Calling sequence-
% z=saw(t)
%
% Input-
%	t	- column vector data t(n) 
% Output-
%	z	- column vector data z(n) that specifies the values 
%		  of saw tooth function
 
% Z.Shen			Initial 

%----- Initialize
n=length(t);
z=zeros(n,1);
T=2.*pi;    %period

%----- Generate the values
for i=1:n
   x=mod(t(i),T);
   z(i)=-1.+2/T*x;
end
return