[R] how to remove "." or replace it with NA?

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From: Yong Wang (wang@galton.uchicago.edu)
Date: Sun 30 May 2004 - 11:24:37 EST


Message-id: <Pine.LNX.4.58.0405292020180.9495@aitken.uchicago.edu>

Hi,all
a quick question
A larger file include many"." (stands for missing
value) for variable, say, x. after
read in the file and assign it another name such as :

x1<-data$x

but x1 is always a facotor but not numerical.

so How can I get a numeric vector from the read in data frame.
how can I replace those "." with "NA" to perform analysis.

thank you very much
best regards

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