[R] does there any function like sumif in excel?

[jim holtman]

yourData$B[yourData$A == someValue]

On Sun, Sep 28, 2008 at 10:25 PM, caocheng曹成 <caocheng8230 at gmail.com> wrote:
> I have a data.frame datas which have two columns A and B.
> I want to filter column A by some values and to get a value list which
> contain the value in B.
> Best wishes!
>
>        [[alternative HTML version deleted]]
>
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-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem that you are trying to solve?