% Author: Housam Binous
% Three variable autocatalator
% National Institute of Applied Sciences and Technology, Tunis, TUNISIA
% Email: binoushousam@yahoo.com
function f=diff_autocatalator(a)
global t x
s=diff(log10(x(4000:end,3)))/0.001;
f=interp1(t(4000:end-1),s,a);
end