Dear R users:
I have got a simple question that has been bothering me for a while.
Given a certain character vector, I would like to get in a separate vector a
fragment of text, in this case the 3rd and 4th letters of each element.
So, if:
v<- c(stratosphere, mesosphere, troposphere)
I want to obtain a different vector like this:
c(ra, so, op)
Thanks in advance for your help
Jonas
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