如何计算数据框列中包含某些数字的单元格

Question

I need to find the number of elements of a vector containing two precise digits, let's say 00.

I thought about using logical indexing but the way R reacts makes me think it is looking for the exact value 00, while I want to know how many times 00 can be found INSIDE the numbers contained in the vector.

Is there a function that does that or some kind of logical indexing I could use?

Answer 1

If I understood well, one work around is to use str_count from stringr as follows:

 df<-data.frame(A=c("00","89","00"))

Sums<-str_count(df$A,"00")
sum(Sums>0)

Using base R and adapting a little of nicola's answer:

sum(grepl("00",df$A)==T)