assigning probability

Hi,

I'm doing a basic simulated annealing experiment and I want to assign a probability to decide whether a variable change is accepted or not.

My probability function is

probability=exp(-(A2-A1)/temp);

where A is the variable that I'm trying to minimise. As temp decreases the probability of accepting A2>A1 decreases, so that A1 will eventually be in a minimal state.

How can I program my code such that if probability=0.8 (where A2>A1 at a high value of temp), there is an 80% chance that the line

A1=A2;

will be accepted.

If I haven't explained the problem clearly enough, please comment and I'll try to elaborate.

Thanks,

Richard

[darksideofthemoon101]

Anyone?

Answer 1

[David Young]

if rand < probability
  A1 = A2;
end