[R] Return the indices of rows of a data frame

Jeff Newmiller jdnewmil at dcn.davis.ca.us
Tue Sep 20 06:06:38 CEST 2016

What do you think?
This is covered in the Introduction to R document that comes with R.
Sent from my phone. Please excuse my brevity.

On September 19, 2016 8:37:30 PM PDT, John <miaojpm at gmail.com> wrote:
>   I have the following dataframe:
>> temp<-data.frame(a=c(1,1,2), b=2:4, c=1:3)
>> row.names(temp)<-c("D", "E", "F")
>> temp
>  a b c
>D 1 2 1
>E 1 3 2
>F 2 4 3
>   I would like R to tell me which rows has value "a" equal to 1. The
>answer is the first row and the second row, or row D and row E. Which
>function should i use? function subset? function which?
>   Thanks!
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