It is easier and more straightforward than any of the suggestions so far. Simply multiply the matrix by 1, or add 0 to it:
x<-matrix(c(TRUE,FALSE,TRUE,FALSE,TRUE,FALSE,TRUE,FALSE,TRUE),nrow=3) 1*x # [,1] [,2] [,3] # [1,] 1 0 1 # [2,] 0 1 0 # [3,] 1 0 1 0+x # [,1] [,2] [,3] # [1,] 1 0 1 # [2,] 0 1 0 # [3,] 1 0 1 Reason: When a logical value takes part in a numeric expression, it is automatically coerced to numeric (0 or 1). As the night-club bouncer said to the un-dressed clubber: "We're not letting you in just wearing Naked Truth. You've got to put on a proper black suit or white suit." Ted. On 20-Jul-11 15:40:49, Joshua Wiley wrote: > Hi, > > I am not sure about "correct", but R stores logical values TRUE/FALSE > as 1/0 already so simply changing the mode would suffice: > > mode(x) <- "numeric" > > alternately > > x + 0 > > HTH, > > Josh > > On Wed, Jul 20, 2011 at 8:16 AM, Julian TszKin Chan <cjul...@bu.edu> > wrote: >> Hi all, >> >> Suppose I have a matrix of logical value: >> >> x<-matrix(c(TRUE,FALSE,TRUE,FALSE,TRUE,FALSE,TRUE,FALSE,TRUE),nrow=3) >> >> I would like to change the value of FALSE to 0 and TRUE to 1. An >> obvious way to do it is : >> y<-as.numeric(x) >> >> However this method doesn't keep the dim of x. I also need to copy the >> dim information to y too. >> attributes(y)<-attributes(x) >> >> Is this a correct way to do it in R? Is there any single step function >> which can do the something? Thanks >> >> >> Regards, >> TszKin Julian >> >> ______________________________________________ >> R-help@r-project.org 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. >> > > > > -- > Joshua Wiley > Ph.D. Student, Health Psychology > University of California, Los Angeles > https://joshuawiley.com/ > > ______________________________________________ > R-help@r-project.org 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. -------------------------------------------------------------------- E-Mail: (Ted Harding) <ted.hard...@wlandres.net> Fax-to-email: +44 (0)870 094 0861 Date: 20-Jul-11 Time: 17:17:56 ------------------------------ XFMail ------------------------------ ______________________________________________ R-help@r-project.org 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.
