[R] Subset error on atomic vectors why?

jcrosbie james at crosb.ie
Thu Apr 3 00:35:49 CEST 2014

I'm getting this error: "Error in MOPrice$Date : $ operator is invalid for
atomic vectors"

The cost is: subset(MOPrice,

The date column looks like:
"2013-12-31" "2013-12-31" "2013-12-31" "2013-12-31" "2013-12-31"

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