[R] locate the rows in a dataframe with some criteria

[Henrique Dallazuanna]

Try:

with(m, which((x >= 10 & y == "A")))

On 07/03/2008, zhihuali <lzhtom at hotmail.com> wrote:
>
>  Hi, netters,
>
>  This is probably a rookie question but I couldn't find the answer after hours of searching and trying.
>
>  Suppose there'a a dataframe M:
>
>  x     y
>  10   A
>  13   B
>  8     A
>   11   A
>
>  I want to locate the rows where x >=10 and y="A". I know how to do it to vectors by using
>  which, but how to do it with the dataframe?
>
>  Thank you very much!
>
>
>  Zhihua Li
>
>
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-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O