Searching for functions that would order strings that mix characters and 
numbers in a "natural" way (ie, "a1 a2 a10" instead of "a1 a10 a2"), I found 
the mixedsort and mixedorder from the gtools package.

1- mixedorder does not work in a "do.call(mixedorder, mydataframe)" call like 
the order function does
2- gtools has not been updated in 2.5 years

Are you aware of an equivalent of this function in base R or a another 
contributed package (with correction of problem #1)?


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