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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