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List of lists: How to add elements to each sub-list?

strotta

Hi!

Assuming that I have a list of lists:

((1 2) (4 5))

Is there any easy way to add elements in the end of each sub-list? i.e:

((1 2 3) (4 5)) or ((1 2) (4 5 6))

Other example with (("Jamie" "Mike" "Tomas") ("Andrew" Harry"))

(("Jamie" "Mike" "Tomas" "Doug") ("Andrew" Harry"))

Thanks in advance Slight smile

Parents
  • skillUser

    Hi,

    It may depend how you are 'finding' or specifying which sublist to add to.  Here's a brief example:

    nlist = '((1 2) (4 5))
    => ((1 2) (4 5))

    ; find the list starting with '1'
    assoc(1 nlist)
    => (1 2)

    ; destructively append to that sub-list (i.e. edit it in place)
    nconc(assoc(1 nlist) '(3))
    => (1 2 3)

    ; inspect the list
    nlist
    => ((1 2 3) (4 5))

    ; find the list starting with '4'
    assoc(4 nlist)
    => (4 5)

    ;destructively append to that sub-list
    nconc(assoc(4 nlist) '(6))
    => (4 5 6)

    nlist
    => ((1 2 3) (4 5 6))

    Hopefully this helps?

    Best regards,

    Lawrence.

Reply
  • skillUser

    Hi,

    It may depend how you are 'finding' or specifying which sublist to add to.  Here's a brief example:

    nlist = '((1 2) (4 5))
    => ((1 2) (4 5))

    ; find the list starting with '1'
    assoc(1 nlist)
    => (1 2)

    ; destructively append to that sub-list (i.e. edit it in place)
    nconc(assoc(1 nlist) '(3))
    => (1 2 3)

    ; inspect the list
    nlist
    => ((1 2 3) (4 5))

    ; find the list starting with '4'
    assoc(4 nlist)
    => (4 5)

    ;destructively append to that sub-list
    nconc(assoc(4 nlist) '(6))
    => (4 5 6)

    nlist
    => ((1 2 3) (4 5 6))

    Hopefully this helps?

    Best regards,

    Lawrence.

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