[R] type of object of a variable in a data frame

From: Chang Liu <changisme_at_hotmail.com>
Date: Wed, 12 Mar 2008 16:17:57 -0700

I have used read.csv to read in a data frame, and there are a few variables in it, however, when I tried is.list(data$V1)

In fact, I have tried, they are not vectors either.  

I'm wondering:

1. What objects are these "lists" of data?
2. How could I find out about the type/inheritence of an object in general?
3. The reason I want it to be a list or vector, is that I want to fill in some blank values, i can't seem to do things like:
data$V1[1] = 3
Is it because these variables are pointers? Is there a better way to do this?  

Sorry to cram so many questions in one email!  


l. Click here to learn how.

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