[R] naive question

[Patrick Connolly]

On Tue, 29-Jun-2004 at 10:31PM -0400, rivin at euclid.math.temple.edu wrote:

|> > We need more details about your problem to provide any useful
|> > help.  Are all the variables numeric?  Are they all completely
|> > different?  Is it possible to use `colClasses'?
|> >
|> It is possible, but very inconvenient. There are mostly numeric columns,
|> but some integer categories, and some string names. The total number is
|> high, so doing this by hand would take several minutes as well, so a
|> different solution is preferable. I did use as.is=TRUE, but that did not

For the lazy typist, here's an idea:

Make a small subset of the datafile (say the first 20 rows) and read
that in with read.table.

X <- read.table("blah.txt", header = TRUE, ........)

Xclasses <- sapply(X, class)

Now we have a nice long vector that you can use in your colClasses
argument with the whole data.  Even if it needs a bit of editing, it
will save you typing in all those "numeric" strings.

HTH

-- 
Patrick Connolly
HortResearch
Mt Albert
Auckland
New Zealand 
Ph: +64-9 815 4200 x 7188
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