Originally Posted by

**rem88** Hi, i have a question about this M file, wondering if anyone could help me:

function dx=gfb(t,x);

dx=zeros(size(x));

u = (0.177*x(2)/(0.005+x(2)));

f = (3000*19.5*exp(u*t)/(630*0.42));

v = (3000+f);

dx(1)=u*x(1) - (f*x(1))/v;

dx(2)=(f*630)/v - (u*x(1))/0.42;

Does anyone know if by setting it up like this, with f as defined sepratly, will it still be intergrated, as it has a t (time) term in it.

also is there a way to plot f and u against time also?

Appreciate any help,

Rem