Hello,
If you write a function, it becomes less convoluted...
empty <- function(x){
if(NROW(x) == 0){
y <- rep(NA, NCOL(x))
names(y) <- names(x)
y
}else x
}
(.xb <- iris[ iris$Species=='zz', ])
empty(.xb)
Hope this helps,
Rui Barradas
Em 10-07-2012 14:15, Liviu Andronic escreveu:
Dear all
Is there a simpler method to achieve the following: When I obtain an
empty data.frame after subsetting, I need for it to contain one line
of NAs. Here's a dummy example:
(.xb <- iris[ iris$Species=='zz', ])
[1] Sepal.Length Sepal.Width Petal.Length Petal.Width Species
<0 rows> (or 0-length row.names)
dim(.xb)
[1] 0 5
(.xa <- data.frame(matrix(rep(NA, ncol(.xb)), 1)))
X1 X2 X3 X4 X5
1 NA NA NA NA NA
names(.xa) <- names(.xb)
(.xb <- .xa)
Sepal.Length Sepal.Width Petal.Length Petal.Width Species
1 NA NA NA NA NA
The solution I came up with is way too convoluted. Anything simpler? Regards
Liviu
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