I have a data
and it has a column yearmonthweek
. For example, 2012y05m1wk
means 1st week of May, 2012. Likewise, 2012y11m3wk
means 3rd week of November, 2012.
data
looks like this:
data<-data.frame(yearmonthweek=c("2012y05m1wk","2012y05m2wk","2012y05m4wk","2012y11m3wk"))
Here, I want to change the expression as below:
data<-data.frame(yearmonthweek=c("2012051","2012052","2012054","2012113"))
How can I do?
Remove the letters from the column could work:
gsub('[a-z]','',data$yearmonthweek)