# Bumps 0.7.6 documentation

## diffev - Differential evolution MCMC stepper

`de_step` | Generates offspring using METROPOLIS HASTINGS monte-carlo markov chain

Differential evolution MCMC stepper.

`bumps.dream.diffev.``de_step`(Nchain, pop, CR, max_pairs=2, eps=0.05, snooker_rate=0.1, noise=1e-06, scale=1.0)

  Generates offspring using METROPOLIS HASTINGS monte-carlo markov chain

  The number of chains may be smaller than the population size if the population is selected from both the current generation and the ancestors.