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is class2 Parameter's Documentation is Ambiguous

Dario Strbenac 
Good day,

It appears that class2 needs to be of length 1.
Error in is(4, c("data.frame", "DataFrame")) : 
  length(class2) == 1L is not TRUE

However, the documentation is "class1, class2: character strings giving the names of each of the two classes between which is relations are to be examined"

Also, class1 is not a parameter of the is function. It is a parameter of the extends function. I think the mention of "is relations" is unintended. Can the documenation be rewritten to remove the ambiguity for these?

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Dario Strbenac
University of Sydney
Camperdown NSW 2050
Australia

Thread (2 messages)

Dario Strbenac is class2 Parameter's Documentation is Ambiguous Aug 16 Thierry Onkelinx is class2 Parameter's Documentation is Ambiguous Aug 16