On Sep 23, 2011, at 8:43 AM, Metronome123 wrote:

Thanks, I will read the posting guide.

Please do it NOW. Before any further postings.


Q1: thanks for helping me out!

Q2: What I mean is that given the dataset:

subject1,class1_yes, class2_no, class3_yes, class4_no
subject2, class1_no, class2_no, class3_no, class4_yes
subject3, class1_yes, class2_no, class3_yes, class4_no

I want to count for each unique class combination the number of subjects that share this whole combination.

In this case the result should be:

2 counts for the combination class1_yes, class2_no, class3_yes, class4_no 1 count for the combination class1_no, class2_no, class3_yes, class4_yes

Perhaps:

with( datfrm, table( interaction( <names of columns> ) ) )

Had you read the Posting Guide you would have found that you are requested to post a working example and you are also given instruction how a proper working example can be created from your own data. The Posting Guide uses 'dump' but I usually use 'dput'. Then we would not have needed to post guesswork and pseudo-code.

--
david.

Regards,


Lars


Op 23 sep. 2011 (w38), om 14:12 heeft Petr Pikal [via R] het volgende geschreven:


[R] Newbie question: Converting Table

Hi,

I'm new to R, and I have searched helpfiles and this forum on my 2
questions. Hope you guys can help me out! :-)

You did not search enough. You probably want table or xtabs

Q1
untested

res <- xtabs(~subject+class, data=your.file)
ifelse(res==1, "yes", "no")

Q2

I do not understand what exactly do you want. Please be more specific.

BTW, if you are in it you'd rather give a look to posting guide.

Regards
Petr


Many thanks in advance!

Cheers,


Lars

Q1: I imported a csv file with columnames subject and class. There are
about

1000 different classes...
It looks like this:
subject1, class1
subject1, class2
subject2, class1
subject2, class3
...
subject999, class1
subject999, class2

Now I want to transform this in R into a table (with columnnames
subject,class1,class2,...) like:
subject1, yes, yes, no, ...
subject2, yes, no, yes, ...
...

Q2: I want to count the matching class patterns in the previous table
(output: in a table with columns count, class1, ...). In this example
for

only the subjects1,2 and 999 it looks like this:
2,yes,yes,no,..
1,yes,no,yes
...



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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

David Winsemius, MD
West Hartford, CT

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and provide commented, minimal, self-contained, reproducible code.

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