On Thu, Mar 12, 2015 at 9:52 PM, John McKown
wrote:
> [...]
> One problem is that Adrian wanted, for some reason, to exclude numbers
> such as "2." but accept "2.0" . That is, no unnecessary trailing
> decimal point. as.numeric() will not fail on "2." since that is a
> number. The example grep() s
On Thu, Mar 12, 2015 at 2:43 PM, Steve Taylor wrote:
> How about letting a standard function decide which are numbers:
>
> which(!is.na(suppressWarnings(as.numeric(myvector
>
> Also works with numbers in scientific notation and (presumably) different
> decimal characters, e.g. comma if that's
om: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Adrian Du?a
Sent: Thursday, 12 March 2015 8:27a
To: r-help@r-project.org
Subject: [R] regex find anything which is not a number
Hi everyone,
I need a regular expression to find those positions in a character
vector which contain something
Perfect, perfect, perfect.
Thanks very much, John.
Adrian
On Wed, Mar 11, 2015 at 10:00 PM, John McKown
wrote:
> See if the following will work for you:
>
> grep('^-?[0-9]+([.]?[0-9]+)?$',myvector,perl=TRUE,invert=TRUE)
>
>> myvector <- c("a3", "N.A", "1.2", "-3", "3-2", "2.")
>> grep('^-?[0-9]+(
See if the following will work for you:
grep('^-?[0-9]+([.]?[0-9]+)?$',myvector,perl=TRUE,invert=TRUE)
> myvector <- c("a3", "N.A", "1.2", "-3", "3-2", "2.")
> grep('^-?[0-9]+([.][0-9]+)?$',myvector,perl=TRUE,invert=TRUE)
[1] 1 2 5 6
>
The key is to match a number, and then invert the TRUE / FAL
Hi everyone,
I need a regular expression to find those positions in a character
vector which contain something which is not a number (either positive
or negative, having decimals or not).
myvector <- c("a3", "N.A", "1.2", "-3", "3-2", "2.")
In this vector, only positions 3 and 4 are numbers, the
6 matches
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