Unknown Item Label in R in Apriori

Question

I am trying to filter rules which contain a certain category of item in the LHS, stored the items belonging to that category in the form of a vector and using this vector with subset to filter all the rules.

The error I am getting is "table contains an unknown item label".

Here's a snapshot of the code below:

top500vec is the vector which contains all the items of the same category,interested at looking for rules with these items on the LHS side

Answer 1

BY just looking at the error, it seems like top500vec contains item labels that are not defined in top500onlyrules . Check itemLabels(top500onlyrules) and make sure that top500vec only contains values that are valid item labels.

You should always post questions with reproducible examples. See: How to make a great R reproducible example