function x = sech(x)
% Sech for adtayl objects.


if ~isreal(x.tc)
  error('X for adtayl objects must not have imaginary part')
end

 [m,n,p] = size(x.tc);
 for i=1:m*n
    
    x1.tc= reshape(x.tc(i,:),[1, 1,p]); 
    x1=class(struct('tc',x1.tc),'adtayl');
    y=  2/(exp(x1)+exp(-x1));   
    xx1.tc(i,:)=y.tc;
   
 end
x.tc = reshape(xx1.tc, m,n,p);