From alireza.s.mahani at gmail.com  Tue Apr 24 18:41:25 2012
From: alireza.s.mahani at gmail.com (Alireza Mahani)
Date: Tue, 24 Apr 2012 09:41:25 -0700 (PDT)
Subject: [Rd] Creating model frame from R formula inside compiled code
Message-ID: <1335285685506-4584124.post@n4.nabble.com>

I am developing a custom regression package, which accepts a formula object
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!


--
View this message in context: http://r.789695.n4.nabble.com/Creating-model-frame-from-R-formula-inside-compiled-code-tp4584124p4584124.html
Sent from the R devel mailing list archive at Nabble.com.



[Rd] Creating model frame from R formula inside compiled code
Alireza Mahani