Random Numbers Random Walk - UMass
Random Numbers Random Walk
Computational Physics Random Numbers Random Walk
Outline
Random Systems Random Numbers Monte Carlo Integration Example Random Walk Exercise 7 Introduction
Random Systems
Deterministic Systems
Describe with equations Exact solution
Random or Stochastic Systems
Models with random processes Describe behavior with statistics
Example
Particles in a Box
Consider 1cm3 box
~1019 particles motion and collisions Not interested in detailed trajectories
Model behavior as result of action of random processes
Statistical Description of Results: e.g. probability of finding particle at particular location
Generation of Random Numbers
Most computing systems and computer languages have a means to generate random numbers between 0 and 1.
Sequence generated from recursive relationship: xn+1 = (a xn + b) mod m
need a "seed" to start the process same sequence generated by each seed
"pseudorandom" in real systems, sequences may repeat
eventually. Caveat Emptor!
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