[R] deleting rows provisionally

[Ben Bolker]

onyourmark wrote:
> 
> I have an object. I think it is a matrix, called 'answer2'
>  str(answer2)
>  int [1:1537, 1:2] 1 399 653 2 3 600 4 5 271 870 ...
>  - attr(*, "dimnames")=List of 2
>   ..$ : chr [1:1537] "a4.1" "hirschsprung.399" "peritoneal.653"
> "abdomen.2" ...
>   ..$ : chr [1:2] "row" "col"
> 
> 
> I want to delete rows that have the same entries.
> 
> 

Your "for" loop didn't make any assignments.
How about 

answer3 <- answer2[-(answer2[,1]==answer2[,2]),]  

or

answer3 <- answer2[answer2[,1]!=answer2[,2],]  

(which will be much faster than a loop anyway)

?
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