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
Carmen Meier wrote:> 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 >Hi, R> nc <- nchar(bits) R> substring(bits,1:nc,1:nc) == "1" R> which( substring(bits,1:nc,1:nc) == "1" ) Cheers, Romain -- Mango Solutions Tel +44 1249 467 467 Fax +44 1249 467 468 Mob +44 7813 526 123 data analysis that delivers
Try: # TRUE if all 0 and 1 regexpr("^[01]*$", bits) > 0 # positions of 1s gregexpr("1", bits)[[1]] On 11/29/06, Carmen Meier <carmei3 at web.de> wrote:> 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 > > ______________________________________________ > R-help at stat.math.ethz.ch 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. >
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 > > ______________________________________________ > R-help at stat.math.ethz.ch 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.
Hi gregexpr can be used bits <-"0011011aaa0" gregexpr("[01]", bits) [[1]] [1] 1 2 3 4 5 6 7 11 attr(,"match.length") [1] 1 1 1 1 1 1 1 1 or grep("[^01]", bits) if you want to know that there is any other character then 0 or 1 gregexpr("1", bits) if you want to know location of 1's HTH Petr On 29 Nov 2006 at 15:06, Carmen Meier wrote: Date sent: Wed, 29 Nov 2006 15:06:08 +0100 From: Carmen Meier <carmei3 at web.de> To: R-help <r-help at stat.math.ethz.ch> 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 > > ______________________________________________ > R-help at stat.math.ethz.ch 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.Petr Pikal petr.pikal at precheza.cz