Preserving Rownames R data table

Asked Jan 21 '16 at 02:19

Active Jan 21 '16 at 03:40

Viewed 541 times

I'm looking to perform an operation on a data table, which has column and row names defined, but then preserve those row names afterwards. For example

library(data.table)
dt <- data.table(rnorm(26))
rownames(dt) <- LETTERS
names(dt) <- "Scores"
dt[abs(Scores) < 2*sd(Scores)]
View(dt)

You can see that after that last operation, the row names are no longer the letters, but just numbered. How can I preserve the row names afterwards, so I know which ones are removed?

edited Jan 21 '16 at 03:40

Frank

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asked Jan 21 '16 at 02:19

abbas786

4

Data.tables do not support row names. See http://stackoverflow.com/questions/24199533/display-row-names-in-a-data-table-object – MrFlick Jan 21 '16 at 02:25
2

Try using a data frame instead, which does support row names. – Tim Biegeleisen Jan 21 '16 at 02:25
Nevertheless, if you are converting a data.frame `DF` with row names, you can use `DT – Konstantinos Jan 27 '16 at 22:40

Preserving Rownames R data table

0 Answers0