[R] For each entry type in column?

mviljamaa mviljamaa at kapsi.fi
Mon Nov 6 18:40:23 CET 2017

How can I do a for loop that does to a data.frame column what:

for x in xs:

does in Python?

Obviously the data.frame column in question holds "levels". What if the 
data.frame is in matrix form?

BR, Matti

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