[R] Odp: Newbie question: Converting Table

[Petr PIKAL]

> 
> [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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> question-Converting-Table-tp3836468p3836468.html
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> 
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> PLEASE do read the posting guide 
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> and provide commented, minimal, self-contained, reproducible code.