[datatable-help] Update columns in data.table programmatically

[Gene Leynes]

I want to update a group of columns programmatically.  Based on a
predetermined list I want to convert the classes of some columns.

This is simple a simple task with data.frame, but in data.table this
requires a confusing combination of `substitute`, `as.symbol`, and `eval`.

Am I doing this right?

My example:   https://gist.github.com/geneorama/4998308

I was about to post a question, but SO suggested this answer:
http://stackoverflow.com/questions/8374816/loop-through-columns-in-a-data-table-and-transform-those-columns

Thank you,

Gene
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