function z=sawt(t)
 
% The function SAWT generates a triangle saw tooth function.
%
% Calling sequence-
% z=sawt(t)
%
% Input-
%	t	- column vector data t(n) 
% Output-
%	z	- column vector data z(n)  that specifies the values 
%		  of a triangle saw tooth function

% Z.Shen			Initial

%----- Initialize
n=length(t);
z=zeros(n,1);
T=2.*pi;    %period
T1=T/2.;

%----- Generate the values
for i=1:n
   x=mod(t(i),T);
   if x <= T1
      z(i)=-1.+2./T1*x;
   else
      x1=x-T1;
      z(i)=1-2./T1*x1;
   end
end
return