[R] Frequency of a character in a string

[Bert Gunter]

Yes, but it need some help, since nchar gives the length of the
*entire* string; e.g.

## to count "a" 's  :

> x <-(c("abbababba","bbabbabbaaaba"))
> nchar(gsub("[^a]","",x))
[1] 4 6

This is one of about 8 zillion ways to do this in base R if you don't
want to use a specialized package.

Just for curiosity: Can anyone comment on what is the most efficient
way to do this using base R pattern matching?

Cheers,
Bert
Bert Gunter

"The trouble with having an open mind is that people keep coming along
and sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )


On Mon, Nov 14, 2016 at 5:52 AM, Brijesh Mishra
<brijeshkmishra at gmail.com> wrote:
> ?nchar in the base R should also help...
>
> On Mon, Nov 14, 2016 at 2:26 PM, Ismail SEZEN <sezenismail at gmail.com> wrote:
>
>>
>> > On 14 Nov 2016, at 11:44, Ferri Leberl <ferri.leberl at gmx.at> wrote:
>> >
>> >
>> > Dear All,
>> > Is there a function to count the occurences of a certain character in a
>> string resp. in a vector of strings?
>> > Thank you in advance!
>> > Yours, Ferri
>> >
>>
>> library(stringr)
>> ?str_count
>>
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