[R] Adding SORT to UNIQUE

[Martin Maechler]

>>>>> Rui Barradas 
>>>>>     on Mon, 20 Dec 2021 17:05:33 +0000 writes:

    > Hello,
    > Package stringr has functions str_sort and str_order, both with an 
    > argument 'numeric' that will sort the numbers correctly.
    > Maybe that's what you are looking for, see the example below.


    > x <- sample(sprintf("ab%d", 1:20))     # shuffle the vector
    > stringr::str_sort(x, numeric = TRUE)   # sort considering the numbers

Again:
There's really no need to use non-base R here (and in almost all
such questions about string handling!)
as Avi Gross' answer shows.


    > Hope this helps,

    > Rui Barradas


    > Às 16:58 de 20/12/21, Stephen H. Dawson, DSL via R-help escreveu:
    >> Hi,
    >> 
    >> 
    >> Running a simple syntax set to review entries in dataframe columns. Here 
    >> is the working code.
    >> 
    >> Data <- read.csv("./input/Source.csv", header=T)
    >> describe(Data)
    >> summary(Data)
    >> unique(Data[1])
    >> unique(Data[2])
    >> unique(Data[3])
    >> unique(Data[4])
    >> 
    >> I would like to add sort the unique entries. The data in the various 
    >> columns are not defined as numbers, but also text. I realize 1 and 10 
    >> will not sort properly, as the column is not defined as a number, but 
    >> want to see what I have in the columns viewed as sorted.
    >> 
    >> QUESTION
    >> What is the best process to sort unique output, please?
    >> 
    >> 
    >> Thanks.

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