www.pudn.com > wenlituxiangjiansuo.rar > reflect.m

function y = reflect(x,minx,maxx) 
 
% function y = reflect(x,minx,maxx) 
% Reflect the values in matrix x about the scalar values minx and maxx. 
% Hence a vector x containing a long linearly increasing series 
% is converted into a waveform which ramps linearly up and down 
% between minx and maxx. 
% If x contains integers and minx and maxx are (integers + 0.5), 
% the ramps will have repeated max and min samples. 
% 
% Nick Kingsbury, Cambridge University, January 1999. 
 
y = x; 
 
% Reflect y in maxx. 
t = find(y > maxx); 
y(t) = 2*maxx - y(t); 
 
% Reflect y in minx. 
t = find(y < minx); 
while ~isempty(t) 
   y(t) = 2*minx - y(t); 
    
   % Repeat until no more values out of range. 
   t = find(y > maxx); 
   if ~isempty(t), y(t) = 2*maxx - y(t); end 
   t = find(y < minx); 
end 
 
return;