Does ?I() help? See ? I() Regards Aval
On Wed, Sep 3, 2008 at 9:30 AM, <[EMAIL PROTECTED]> wrote: > R Users: > > I'm wondering: > > Why does my logical vector becomes a numeric vector when stuffed into a data > frame? How do I change this so that it's retained as a logical data type? > I've tried a couple of things but to no avail. > > Here's my example code: > > # Exercise 4-1 in Non-Detects and Data Analysis. Dennis Helsel. 2005. > > # "Create two new variables in the Interval Endpoints format, StartCu and > EndCu, > # that will contain the same information given by the current variables > > library(NADA) > data(CuZn) > names(CuZn) > > StartCu <- ifelse(CuZn$CuCen == "TRUE", 0, CuZn$Cu) > EndCu <- CuZn$Cu > > CuIEP = data.frame(cbind(Cu = CuZn$Cu, CuCen = CuZn$CuCen, StartCu, EndCu)) > > class(CuZn$CuCen) > #returns "logical" > class(CuIEP$CuCen) > #returns "numeric" > > CuIEP2 = data.frame(cbind(Cu = CuZn$Cu, CuCen = as.logical(CuZn$CuCen), > StartCu, EndCu)) > class(CuIEP2$CuCen) > #returns "numeric" > > CuIEP3 = data.frame(cbind(Cu = CuZn$Cu, CuCen = I(CuZn$CuCen), StartCu, > EndCu)) > class(CuIEP3$CuCen) > #returns "numeric" > > I think that I might be missing something fairly fundamental about data > coercion in R. ... would love to figure this out. > > Any assistance would be appreciated. > > Thanks much, > > Matt Findley > > ______________________________________________ > [email protected] 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. > ______________________________________________ [email protected] 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.
