Re: [R] length of empty string

2011-11-18 Thread R. Michael Weylandt
Because it's a character vector with only one element, which just happens to be empty - sort of like why the cardinality of the set { /O } is one. (/O being my best shot at the empty set symbol in plain text). You might be thinking of nchar(). Michael On Nov 18, 2011, at 10:09 AM, "Jaensch,

Re: [R] length of empty string

2011-11-18 Thread David Winsemius
On Nov 18, 2011, at 10:09 AM, Jaensch, Steffen [TIBBE] wrote: Hi all, Can somebody explain why length("") returns 1 and not 0? How do I test if a given string is the empty string? character(0) is not the same as "" -- David Winsemius, MD West Hartford, CT __

Re: [R] length of empty string

2011-11-18 Thread Rainer Schuermann
> nchar("") > > [1] 0 On Friday 18 November 2011 16:09:38 Jaensch, Steffen [TIBBE] wrote: > Hi all, > > > > Can s

Re: [R] length of empty string

2011-11-18 Thread Milan Bouchet-Valat
Le vendredi 18 novembre 2011 à 16:09 +0100, Jaensch, Steffen [TIBBE] a écrit : > Hi all, > > Can somebody explain why length("") returns 1 and not 0? Probably because it contains one element, "". > How do I test if a given string is the empty string? a <- "" a == "" [1] TRUE Seems to be enough to

[R] length of empty string

2011-11-18 Thread Jaensch, Steffen [TIBBE]
Hi all, Can somebody explain why length("") returns 1 and not 0? How do I test if a given string is the empty string? Thanks, Steffen. [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.c