This is fantastic.
As a future note to myself and to others who may stumble upon this:
further documentation for all one's heart could desire is in the base
help system at.
Regular Expressions as used in R - regexp
Pattern Matching and Replacement - grep
Split the Elements of a Character Vector
This has the disadvantage of producing a warning when it finds
non-numerics and also there
are situations like 1E1 which it will regard as numeric so using
a regexp is probably preferred but it is simple:
!is.na(as.numeric(x))
On Thu, Apr 24, 2008 at 10:39 PM, Farrel Buchinsky <[EMAIL PROTECTED]
The following will return the indices or the values of character
strings that are all numeric:
> x <- c("12345", "123AS23", "A123", "398457")
> grep("^[[:digit:]]*$", x) # index
[1] 1 4
> grep("^[[:digit:]]*$", x, value=TRUE) # values
[1] "12345" "398457"
>
On Thu, Apr 24, 2008 at 10:39 PM
I have a bunch of tables in a Microsoft Access database. An updated database
is sent to me every week containing a new table. I know that is inefficient
and weird but welcome to my life. I want to read the tables whose names are
something such as "040207" but not the ones that have alphanumeric nam
4 matches
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