[R] subsetting a dataframe

[William Dunlap]

Use is.element(elements,set), or its equivalent, elements %in% set:

df <- data.frame(dd = c(1, 2, 3),
                 rows = c("A1", "A2", "A3"),
                 columns = c("B1", "B2", "B3"),
                 numbers = c(400, 500, 600))
test_rows <-c("A1","A3")
df[ is.element(df$rows, test_rows), ]
#  dd rows columns numbers
#1  1   A1      B1     400
#3  3   A3      B3     600


Bill Dunlap
TIBCO Software
wdunlap tibco.com

On Mon, Jun 8, 2015 at 3:44 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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>
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