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(for example, TA should be divided into two columns “A” in the first “T” second) in r

I have the following problem, I could solve:

set.seed (1234)
mydf <- data.frame (var1a = sample (c("TA", "AA", "TT"), 5, replace = TRUE),
                    varb2 = sample (c("GA", "AA", "GG"), 5, replace = TRUE),
                    varAB = sample (c("AC", "AA", "CC"), 5, replace = TRUE)
                    )
     mydf 

  var1a varb2 varAB
1    TA    AA    CC
2    AA    GA    AA
3    AA    GA    AC
4    AA    AA    CC
5    TT    AA    AC

I want to split two letters into different columns, and then sort them alphabetically.

Change: it is possible to sort before separation, for example var1a the value "TA" var1a should be "AT" or after separation, so var1aa should be "A" and var1ab should be "T" (instead of "T", "A"). therefore sorting is inside each cell.

split_col <- function(.col, data){
    .x <- colsplit( data[[.col]], names =  paste0(.col, letters[1:2]))
   }

split each column and combine

    require(reshape)
    splitdf <- do.call(cbind, lapply(names(mydf), split_col, data = mydf))

 var1aa var1ab varb2a varb2b varABa varABb
1      T      A      A      A      C      C
2      A      A      G      A      A      A
3      A      A      G      A      A      C
4      A      A      A      A      C      C
5      T      T      A      A      A      C

But with the unresolved part, I want to order a pair of columns so that columns "a" and "b" are sorted alphabetically. Thus, the expected result:

    var1aa var1ab varb2a varb2b varABa varABb
1      A      T      A      A      C      C
2      A      A      A      G      A      A
3      A      A      A      G      A      C
4      A      A      A      A      C      C
5      T      T      A      A      A      C

Can I order (briefly with each pair of variables)?

+5
1
mylist <-as.list(mydf)

splits <- lapply(mylist, reshape::colsplit, names=c("a", "b"))
rowsort <- lapply(splits, function(x) t(apply(x, 1, sort)))
comb <- do.call(data.frame, rowsort)
comb

  var1a.1 var1a.2 varb2.1 varb2.2 varAB.a varAB.b
1       A       T       A       A       C       C
2       A       A       A       G       A       A
3       A       A       A       G       A       C
4       A       A       A       A       C       C
5       T       T       A       A       A       C

EDIT: , :

replaceNums <- function(x){
  .which <- regmatches(x, regexpr("[[:alnum:]]*(?=.)", x, perl=TRUE))
  stopifnot(length(x) %% 2 == 0) #checkstep
  paste0(.which, c("a", "b"))
}

names(comb) <- replaceNums(names(comb))
comb
  var1aa var1ab varb2a varb2b varABa varABb
1      A      T      A      A      C      C
2      A      A      A      G      A      A
3      A      A      A      G      A      C
4      A      A      A      A      C      C
5      T      T      A      A      A      C
+5

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