[R] subsetting a dataframe

[Ryan Derickson]

Lots of ways to do this, I use %in% with bracket notation [row, column].
The empty column argument below returns all columns but you could have
conditional logic there as well.

dd[dd$rows %in% test_rows, ]



On Mon, Jun 8, 2015 at 6:44 PM, Bogdan Tanasa <tanasa at gmail.com> wrote:

> Dear all,
>
> would appreciate your suggestions on subsetting a dataframe : please let's
> consider an example dataframe df:
>
> dd<-c(1,2,3)
> rows<-c("A1","A2","A3")
> columns<-c("B1","B2","B3")
> numbers <- c(400, 500, 600)
> df <- dataframe(dd,rows,columns, numbers)
>
> and a vector : test_rows <-c("A1","A3") ;
>
> how could I subset the dataframe df function of vector test_rows, in such a
> way that only the lines of dataframe df (df$rows) that match the elements
> of test_rows ("A1" and "A3") are listed ?
>
> thank you very much,
>
> -- bogdan
>
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