CODEWITHSUNDEEP
r
user1769818
user1769818

Reputation: 23

Calculating occurrences in R

I want to calculate the number of occurrences of a character in a string,

I've tried

length(grep("3", "987654332")[[1]])

[1] 1

It doesn't calculate the second occurrence of "3".

I also tried

length(gregexpr("0", "98765432")[[1]])

[1] 1

This calculate the multiple occurrences fine, but returns 1 for non occurring values.

Thank you!

Upvotes: 2

Views: 172

Answers (1)

flodel
flodel

Reputation: 89067

Because gregexpr returns -1 when there is no match, you can do:

> sum(gregexpr("3", "3398765432")[[1]] != -1)
[1] 3
> sum(gregexpr("0", "3398765432")[[1]] != -1)
[1] 0

Upvotes: 4

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