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.
