Identify Objects that end with .f (and all caps)
On May 14, 2011, at 3:38 PM, Sparks, John James wrote:
Dear R Helpers, I am trying to find a way to identify all the objects in my environment that are all caps and then end with .f. I can do the all caps part pretty easily, but I have tried a number of variations on the \ and can't get a recognition of that operator. As a simple example A.f<-"foo1" AA.f<-"foo2" aa.f<-"foo3" A.a<-"foo4" ls() [1] "A.a" "A.f" "aa.f" "AA.f" temp1<-ls(pattern="[A-Z]") temp1 [1] "A.a" "A.f" "AA.f"
temp2<-ls(pattern=\f)
Error: unexpected input in "temp2<-ls(pattern=\"
You need to double the '\': temp1<-ls(pattern="[A-Z]\\.f") > temp1 [1] "A.f" "AA.f" "NYSE.A.f"
The end goal is to isolate A.f and AA.f and not the others. In terms of just getting the 'ending with .f' portion, I have tried a number of variations in the pattern=\f, but can't get R to recognize what I want. Your guidance would be much appreciated. --John J. Sparks, Ph.D.
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