I have noticed that after I ran a batch script multiple times I get multiple copies of a package's name when I call search(). Is this a problem?
> search() [1] ".GlobalEnv" "DF" "DF" [4] "DF" "DF" "DF" multiple copies here ... [13] "DF" "DF" "DF" other packages here ... [28] "package:quadprog" "package:car" "package:methods" [31] "package:stats" "package:graphics" "package:grDevices" [34] "package:utils" "package:datasets" "Autoloads" [37] "package:base" The following strange (to me) behavior that may be related. Suppose I have a variable x that is in the global environment, and also there is an 'x' in a dataframe called DF. Then I remove the variable x from the Global Environment, with remove('x', pos = 1) At this point if I call remove again in the same way I get an error: the variable x does not exist anymore. However, at this point I also can check that DF$x exists. So far so good. Further down in my code I have an assignment of the type x[i] <- something (*) which works fine, except that then if I look at x[i] and DF$x[i] they are different. So it looks like x was recreated in the Global Environment, which I actually can check by typing .GlobalEnv$x. On the other hand, if I put in my code something like newvar[i] <- something where newvar was never defined, then I get an error. I was hoping that the statement (*) above would assign to the variable DF$x. But it looks like (although that is probably not the correct explanation) that the interpreter somehow "remembers" that once there was a variable x in the global environment and accepts the assignment to x[i], recreating that variable. Any insights on this? Many thanks, Fernando ______________________________________________ R-help@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