On Tue, Jul 10, 2012 at 9:15 AM, Liviu Andronic <[email protected]> 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> -- Statistics & Software Consulting GKX Group, GKX Associates Inc. tel: 1-877-GKX-GROUP email: ggrothendieck at gmail.com ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
