The real problem with data.table is that it has too much magic. It's great for interactive use, but it's hard to program to. If, for example, you want to aggre

The real problem with data.table is that it has too much magic. It's great for interactive use, but it's hard to program to. If, for example, you want to aggregate a table using a list of supplied variable names, like if you wanted to abstract out some aggregation code, you need to descend into horrible quote/substitute/etc. hackery to make it work.