function yhat=oxygen_fit_new_equation(beta,x)
%OXYGEN_FIT_NONE - dissolved oxygen calculation (no trend) 

% $Revision: 1.6 $
% $Date: 2008/04/09 00:02:18 $
% $Id: oxygen_fit_none.m,v 1.6 2008/04/09 00:02:18 duncombe Exp duncombe $

%
b1=beta(1);
b2=beta(2);
b3=beta(3);
b4=beta(4);
b5=beta(5);
b6=beta(6);
x1=x(:,1);
x2=x(:,2);
x3=x(:,3);
x4=x(:,4);
yhat=((b1.*(x1+b2))).*(1.0+(b3.*x3)+(b4.*x3.^2)+(b5.*x3.^3)).*x2.*exp((b6.*x4)./(x3+273.15));

return;

