varnames() returns the variable names and chanames
returns the chain names, or NULL if these are not set.
If allow.null = FALSE then NULL values will be
replaced with canonical names.
varnames(x, allow.null=TRUE)
chanames(x, allow.null=TRUE)
varnames(x) <- value
chanames(x) <- valuean mcmc or mcmc.list object
Logical argument that determines whether the function may return NULL
A character vector, or NULL
A character vector , or NULL.