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

[John Kane]

There are several ways to subset the dataframe 
?select will give you one.

or mydata[mydata$A=value]<- mydata

then apply sum()


I do not think there is one single command equivalent to sumif()



--- On Sun, 9/28/08, caocheng曹成 <caocheng8230 at gmail.com> wrote:

> From: caocheng曹成 <caocheng8230 at gmail.com>
> Subject: [R] does there any function like sumif in excel?
> To: R-help at r-project.org
> Received: Sunday, September 28, 2008, 10:25 PM
> 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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> and provide commented, minimal, self-contained,
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