fill 0-row data.frame with 1 line of NAs
Why does one want to replace a zero-row data.frame with a one-row data.frame of NA's? Unless this is for an external program that cannot handle zero-row inputs, this suggests that there is an unnecessary limitation (i.e., a bug) in the R code that uses this data.frame. Bill Dunlap Spotfire, TIBCO Software wdunlap tibco.com
-----Original Message----- From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of arun Sent: Wednesday, July 11, 2012 10:03 AM To: Liviu Andronic Cc: R help Subject: Re: [R] fill 0-row data.frame with 1 line of NAs 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 -- Do you know how to read? http://www.alienetworks.com/srtest.cfm http://goodies.xfce.org/projects/applications/xfce4-dict#speed-reader Do you know how to write? http://garbl.home.comcast.net/~garbl/stylemanual/e.htm#e-mail
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