On Thu, 2 Apr 2009, Yue Sheng wrote:
Hi, since bigglm doesn't have update, I was wondering how to achieve
something like (similar to the example in ff package manual using biglm):
bigglm() doesn't have update because it needs to iterate over the data and
update() couldn't do that.
Instead of calling update(), you have to supply a function that will load
the next chunk of data, and that can be reset to start again at the
beginning. There is an example on the help page, and the code for
bigglm.data.frame gives another example, as do the SQLiteConnection
and RODBC methods.
-thomas
first <- TRUE
ffrowapply ({
if (first) {
first <- FALSE
fit <- bigglm(eqn, as.data.frame(bigdata[i1:i2,,drop=FALSE]), chunksize =
10000, family = binomial())
} else {
fit <- update(fit, as.data.frame(bigdata[i1:i2,,drop=FALSE]), chunksize =
10000, family = binomial())
}
}, X=bigdata, VERBOSE = TRUE, BATCHSIZE = nmax)
Many thanks.
Yuesheng
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Thomas Lumley Assoc. Professor, Biostatistics
[email protected] University of Washington, Seattle
______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
