[R] Crosscorr.plot

[Doran, Harold]

Just out of curiosity, why might this be occuring:

> class(x6)
[1] "mcmc"
> crosscorr.plot(x6)
NULL

# Replicable code 

example(lmer)
x6 <- mcmcsamp(fm1, n=1000)
crosscorr.plot(x6)