[R] indexing question

[ONKELINX, Thierry]

Dear Bunny,

You need to add a comma: data[data$particularcol ==1, ] 

data[put here the conditions for rows, put here conditions for columns].


HTH,

Thierry

------------------------------------------------------------------------
----
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature
and Forest
Cel biometrie, methodologie en kwaliteitszorg / Section biometrics,
methodology and quality assurance
Gaverstraat 4
9500 Geraardsbergen
Belgium 
tel. + 32 54/436 185
Thierry.Onkelinx at inbo.be 
www.inbo.be 

To call in the statistician after the experiment is done may be no more
than asking him to perform a post-mortem examination: he may be able to
say what the experiment died of.
~ Sir Ronald Aylmer Fisher

The plural of anecdote is not data.
~ Roger Brinner

The combination of some data and an aching desire for an answer does not
ensure that a reasonable answer can be extracted from a given body of
data.
~ John Tukey

-----Oorspronkelijk bericht-----
Van: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
Namens Bunny, lautloscrew.com
Verzonden: dinsdag 13 januari 2009 10:26
Aan: r-help at r-project.org
Onderwerp: [R] indexing question

Hi all,

i have a pretty easy indexing question, at least i believe so. The  
main reason i post it here, is that brackets and $ are hard to google.

How do I index correctly, if i just want to display the whole dataset  
conditioned on the fact that some particular column equals one.

I know i can do something like:   data$somecolumn[data$particularcol  
==1] . That will show all "some column" values where the particular  
column is 1.
Unfortunately something like : data[data$particularcol ==1] does not  
work to get the whole matrix.

is there some easy way except the % in % stuff ?

Thx in advance

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