margin: The dimension on which applying the function. Maybe "all" (default) to apply the function on all values, "var" to apply the function on the variability dimension, "unc" to apply the function on the uncertainty dimension, or "variates" to apply the function on the variates. Watch out: do not use 'var' for 'variates'
fun: The function to be applied. When applied to a vector of length n , fun should return a vector of length n
or 1 .
...: Optional arguments to fun .
Returns
If fun returns a function of length n or if margin="all" , the returned mcnode s are of type and dimension of x . In other cases, the type of mcnode is changed.