Retrieves the number of mcmc chains in each components of the argument.
an rv object (supposed to be generated by a MCMC process)
Assumes that the rv object was generated by a MCMC process. Umacs and R2WinBUGS are compatible.
Jouni Kerman email@example.com
Kerman, J. and Gelman, A. (2007). Manipulating and Summarizing Posterior Simulations Using Random Variable Objects. Statistics and Computing 17:3, 235-244.