R: How can I replace let's say the 5th element within a string?

Question

I would like to convert the a string like be33szfuhm100060 into BESZFUHM0060.

In order to replace the small letters with capital letters I\'ve so far used the gsub f

Answer 1

A couple of observations:

Cnverting a string to uppercase can be done with toupper, e.g.:

> toupper('be33szfuhm100060')
> [1] "BE33SZFUHM100060"

You could use substr to extract a substring by character positions and paste to concatenate strings:

> x <- 'be33szfuhm100060'
> paste(substr(x, 1, 2), substr(x, 5, nchar(x)), sep='')
[1] "beszfuhm100060"