type of object of a variable in a data frame

class(data)
class(data$V1)
str(data)
str(data$V1)
dput(data)
dput(data$V1)

Hello!
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)

FALSE

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!

Karen

_________________________________________________________________

l. Click here to learn how.

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______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

is(data$V1)

Have a look at the refcard that you can download from cran.r-project.org or
please take a look at one of the many other manuals that are provided there
for free (many manuals are also available elsewhere on the internet, so you
can google them). Almost all of them answer these basic questions. (Sorry
for not giving credit to the one who has written the refcard, but it slipped
my mind who.)

Also you can type help.search("put your search term here") or
RSiteSearch("put your search term here") to check whether your question has
been addressed by others before.

Cheers.


-------------------------
cuncta stricte discussurus
-------------------------

-----Urspr?ngliche Nachricht-----
Von: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] Im
Auftrag von Chang Liu
Gesendet: Wednesday, March 12, 2008 7:18 PM
An: R Help
Betreff: [R] type of object of a variable in a data frame


Hello! 
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)

FALSE

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!
 
Karen
_________________________________________________________________

l. Click here to learn how.


______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

Chang Liu <changisme at hotmail.com> wrote in
news:BAY144-W56113AA5B8B59D44C17F37BE080 at phx.gbl:

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? 

You have not given reproducible code, so it is difficult to know why that 
does not succeed. I have a data.frame with a similar name left over from 
another problem. When I enter DATA$V1[1] = -.5 , it has the desired 
effect. Although it is not the source of the error,  you should learn to 
use "<-" rather than "=". You should also learn to post questions with 
reproducible code.

David Winsemius