[R] String question

[John Fox]

Dear Carmen,

length(grep("[^01]", bits)) == 0

should do the trick, returning TRUE if the string contains only 0's and 1's.

I hope this helps,
 John

--------------------------------
John Fox
Department of Sociology
McMaster University
Hamilton, Ontario
Canada L8S 4M4
905-525-9140x23604
http://socserv.mcmaster.ca/jfox 
-------------------------------- 

> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Carmen Meier
> Sent: Wednesday, November 29, 2006 9:06 AM
> To: R-help
> Subject: [R] String question
> 
> Hi to all
> I would to determinate whether bits is a binary code and I 
> would to find out the which bit is set to 1
> 
> bits <-"00110110"
> I found to detect whether there are only numbers
> all.digits(bits)
> but is there any function to detect whether there are only 0 
> and 1 in the string
> 
> And how could I get the f.e the third "bit" from the right hand side
> 
> With regards Carmen
> 
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