Just something I learned about using the initial expressions, the second expression is updated by the first inside the table, so if you read this and are looking at the Linear Prey-Predator model don't copy the set of expressions that I used. Mine go ahead of themselves compared to the books.

Dear Declan,

just to make sure, that it is what you want to do. You see, if you want to create a list, there is a much easier way to do that. In the code above there are three functions Do, Sow, and Reap. This is because I understood that you want to use a Do loop. You can of course also do this:

t = 500; d = 200; alpha = 0.5; beta = 0.4; gamma = 0.1; delta = 0.17;

Table[{t = ((1 - alpha)*t) + (beta*d), d = (-delta*t) + (1 + gamma)*d}, {i, 1, 10}]

which does the same thing with only one (!) function.

Cheers, Marco

Thank you, I am on my way again, these are new functions to me, however they do the job.