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simple sort question

nosaj

I'm trying to sort a list of strings with sort alphalessp, can anyone explain why "l" in the list is dropped in the following example?

How may I sort the list without losing elments AND changing the original list?

I tried saving list a to a tmp list, that doesn't seem to help.  

Thanks in advance!

Commands :

a=list("res" "sumW" "w" "sumL" "l" "rs" "segSp" "srs")
length(a)
sort(a 'alphalessp)
length(a)
a

CIW Output :

a=list("res" "sumW" "w" "sumL" "l" "rs" "segSp" "srs")
("res" "sumW" "w" "sumL" "l"
    "rs" "segSp" "srs"
)
length(a)
8
sort(a 'alphalessp)
("l" "res" "rs" "segSp" "srs"
    "sumL" "sumW" "w"
)
length(a)
7
a
("res" "rs" "segSp" "srs" "sumL"
    "sumW" "w"
)

Parents

  •  Hi,

    Yes, this is because "sort" is a destructive list operator, so 'a' is modified in place, to be safe, assign the return value of sort back to the variable:

     a = sort(a 'alphalessp)

     You can assign the variable contents to another variable before sorting, if you don't want to change 'a':

     b = copy(a)
 b = sort(b 'alphalessp)

     Or you could write your own sorting algorithm!

    Hope this helps.

    Regards,

    Lawrence.

Reply

  •  Hi,

    Yes, this is because "sort" is a destructive list operator, so 'a' is modified in place, to be safe, assign the return value of sort back to the variable:

     a = sort(a 'alphalessp)

     You can assign the variable contents to another variable before sorting, if you don't want to change 'a':

     b = copy(a)
 b = sort(b 'alphalessp)

     Or you could write your own sorting algorithm!

    Hope this helps.

    Regards,

    Lawrence.

Children
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