Rolf Turner wrote:
On 19/10/2009, at 4:23 PM, milton ruser wrote:
Hi there,
Try ?subset
No. Don't.
Just do:
X <- dataframe[dataframe$Name=='T44',]
Note the comma in the penultimate position.
Read up on array indexing; see ?"[" and An Introduction to R,
section 5.2 for starters.
A data frame is two dimensional; you were basically trying to
treat it as one dimensional.
And don't call your data frame ``dataframe''. Would you
call your dog ``dog''? (Pace Barry Rowlingson! :-) )
cheers,
Rolf Turner
?str may also be useful..
str is indeed useful --- but not here.
Rolf, I would disagree. For anyone new to R, it's a good idea
to use str() after any operation they were sufficiently
unsure about to ask for help.
Cheers,
-Peter Ehlers
R. T.
bests
milton
On Sun, Oct 18, 2009 at 11:10 PM, ANJAN PURKAYASTHA <
anjan.purkayas...@gmail.com> wrote:
Hi,
newbie question. I have a data-frame with 3 named columns: Name, Obs1,
Obs2.
The Name column members are made of alphanumeric characters: T1, T2, T3
etc.
I would like to acess only that subset of the data-frame with Name ==
T44.
X <- dataframe[dataframe$Name=='T44'] does not work.
Any ideas on how to do this?
I'm sure I'm missing a simple concept here.
Thanks,
Anjan
--
=============================
anjan purkayastha, phd
bioinformatics analyst
whitehead institute for biomedical research
nine cambridge center
cambridge, ma 02142
purkayas [at] wi [dot] mit [dot] edu
703.740.6939
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