I would like to subset by dataframe by matching all rows that have any value
from a list of values.  I can get it to work if I have exactly one value,
I'm not
sure how to do it with a list of values though.

This works and gives me exactly one line:
my.df[ which( mydf$IDX==17)), ]

I would like to do something like this:
my.df[ which( mydf$IDX==c(17, 42), ]

Obviously that won't work, but I hope the meaning is clear.
What's the right way to express this?

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