On 20/12/2021 12:32 p.m., Martin Maechler wrote:
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.
That gives a different sort order:
stringr::str_sort(x, numeric = TRUE)
gives
[1] "ab1" "ab2" "ab3" "ab4" "ab5" "ab6" "ab7" "ab8" "ab9"
"ab10" "ab11" "ab12" "ab13" "ab14" "ab15" "ab16" "ab17"
[18] "ab18" "ab19" "ab20"
(with the numbers in order), while sort(x) gives
[1] "ab1" "ab10" "ab11" "ab12" "ab13" "ab14" "ab15" "ab16" "ab17"
"ab18" "ab19" "ab2" "ab20" "ab3" "ab4" "ab5" "ab6"
[18] "ab7" "ab8" "ab9"
with the characters in order. I don't think the "numeric" option is
available in base R (though of course you could write a function to do
it, so there's no *need*, but it's certainly more convenient to use the
stringr function if that's the order you want).
Duncan Murdoch
> 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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______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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