[R] fill 0-row data.frame with 1 line of NAs

[Gabor Grothendieck]

On Tue, Jul 10, 2012 at 9:15 AM, Liviu Andronic <landronimirc at gmail.com> wrote:
> 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
>

Try this:

Try this:

>  iris[NaN,]
   Sepal.Length Sepal.Width Petal.Length Petal.Width Species
NA           NA          NA           NA          NA    <NA>

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