Named dimensions of MCMC objects
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) <- value
x | 
 an   | 
allow.null | 
 Logical argument that determines whether the function may return NULL  | 
value | 
 A character vector, or NULL  | 
A character vector , or NULL.
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