Message-ID: <1342026164.56364.YahooMailNeo@web39402.mail.mud.yahoo.com>
Date: 2012-07-11T17:02:44Z
From: arun
Subject: fill 0-row data.frame with 1 line of NAs
In-Reply-To: <CABxs9Vn5NHMSmY7TdL3CQjyPv6vTd_wB=oBtOjXqmaKoZSAS9Q@mail.gmail.com>
Hi,
Try this:
.xa<-iris[1,][rep(NA,length(iris),1),]
.xa
#?? Sepal.Length Sepal.Width Petal.Length Petal.Width Species
#NA?????????? NA????????? NA?????????? NA????????? NA??? <NA>
#or
.xb<-iris[1,][rep(NA,ncol(iris),1),]
?.xb
#?? Sepal.Length Sepal.Width Petal.Length Petal.Width Species
#NA?????????? NA????????? NA?????????? NA????????? NA??? <NA>
A.K.
----- Original Message -----
From: Liviu Andronic <landronimirc at gmail.com>
To: "r-help at r-project.org Help" <r-help at r-project.org>
Cc:
Sent: Tuesday, July 10, 2012 9:15 AM
Subject: [R] fill 0-row data.frame with 1 line of NAs
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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