as way of setting up the model matrix and response variable from a data
frame. For large data sets, I expect that going through R memory might be
too slow, so I'm thinking about reading the data directly into C (e.g. from
a database) and then parsing the formula inside of C (by calling an R
function such as model.frame()). Is this possible? An alternative solution
is to read the large data set into R in chunks, create the model matrix for
each chunk and save the matrix chunk to disk, and then load and piece
together these chunks inside of C. But my solution seems sub-optimal to me.
Any suggestions? Thank you!
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