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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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
David Winsemius, MD
West Hartford, CT
______________________________________________
[email protected] mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
