How to derive a simple difference equation from a differential equation?
for example, the discrete form of logistic equation is n(t)=a/(1+b*n(t-1)). Mine equation is much complicated than the logistic equation. Can someone tell me how to derive the discrete form of the logistic equation? ???
then start from there, I can work out my problem.
Thank you!!

Question

anonymous · Answer

whats your equation

anonymous · Answer

actually it is a set of equations:
dn/dt=a*n-b*n*m/(c+n)
dm/dt=d*m*a*n/(c+n)-e*m
a,b,c,d,e are constants

anonymous · Answer

sorry this is new to me, i need to read up on it  do you have a website etc

anonymous · Answer

I am just looking for the right material to read on the web. but no luck at this moment.

anonymous · Answer

You need to solve these with laplace transforms, also matlab can solve systems of ordinary differential equations. move all terms involving the independent variable and its derivatives on one side and all constant terms on the other side, You can then use the laplace transform approach to solve the problem.