R help - Jul 2021 - problem for strsplit function

> sub( "\\.[^.]*$", "", fname )
fwiw, i almost always use '[.]' in preference to '\\\\\\\\.', as
it
seems to be more likely to get through the various levels of quoting in
different contexts.

I trust the escapes to do what they are designed to do. Cat the pattern to the
console if you don't.

On July 7, 2021 10:36:43 PM PDT, Greg Minshall <minshall at umich.edu>
wrote:
>> sub( "\\.[^.]*$", "", fname )
>
>fwiw, i almost always use '[.]' in preference to
'\\\\\\\\.', as it
>seems to be more likely to get through the various levels of quoting in
>different contexts.
-- 
Sent from my phone. Please excuse my brevity.

Hello all,
I have to learning R from beginning, since my group will get rid of SAS. So, my
question may not be very clear for professional R user. I always dealing with
column in data frame, not data vector.?
Many thanks to Greg's example. it is very helpful.
one more question, how can I know if the function is for column manipulations or
for vector?
Thank you,
Kai
    On Wednesday, July 7, 2021, 10:36:53 PM PDT, Greg Minshall <minshall at
umich.edu> wrote:
 
 > sub( "\\.[^.]*$", "", fname )

fwiw, i almost always use '[.]' in preference to '\\\\\\\\.', as
it
seems to be more likely to get through the various levels of quoting in
different contexts.
  
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