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Create an Empty Data.Frame
I need to create an empty data frame in R with specified column names. Any simplest way ?
asked Sep 27, 2012 at 4:04
Surjya Narayana Padhi
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2 Answers
Just create a data.frame with 0 length variables
eg
nodata <- data.frame(x= numeric(0), y= integer(0), z = character(0))
str(nodata)
## 'data.frame': 0 obs. of 3 variables:
## $ x: num
## $ y: int
## $ z: Factor w/ 0 levels:
or to create a data.frame with 5 columns named a,b,c,d,e
nodata <- as.data.frame(setNames(replicate(5,numeric(0), simplify = F), letters[1:5]))
2 Comments
pssguy
why does z convert to Factor?
Antoine Lizée
@pssguy because of the default behaviour of data.frame, and specifically the default value for the argument stringsAsFactors = T.
Perhaps:
> data.frame(aname=NA, bname=NA)[numeric(0), ]
[1] aname bname
<0 rows> (or 0-length row.names)
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