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how to simultaneously traverse varaiable number of lists?

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If I want to traverse, lets's say for example, 3 lists at one time, I would use:

list1 = '(1 2 3)
list2 = '(4 5 6)
list3 = '(7 8 9)
foreach((x y z) list1 list2 list3
    printf("%L %L %L\n" x y z)
)
But, how do you do this, when you don't know how many lists that you will need to traverse? Is this easily done in SKILL? Or, will I have to brute force it using elemental list access, like so?
listOfLists = '((1 2 3) (4 5 6) (7 8 9))
for(j 1 length(car(listOfLists))
    string = ""
    foreach(l listOfLists
        string = sprintf(nil "%s %L" string nthelem(j l))
    )
    printf("%s\n" string)
)
Do you know a better way?  Please remember that I do not know the number of lists in the listOfLists a priori (although I do know the lists are all the same length); otherwise, I would use the structure from the first example ...

Thanks!


Originally posted in cdnusers.org by m27315
Parents

  • Apologies, I should have used the "Quote" button at the top - my code has had the indentation stripped as a result. It should have been:

    apply('mapc
    `(lambda((@rest entries)
    let((string)
    string=""
    foreach(entry entries string=sprintf(nil "%s %L" string entry))
    printf("%s\n" string)
    ) ; let
    ); lambda
    ,@listOfLists
    ) ; end of backquote list
    ) ; apply


    and:

    apply('mapc
    cons(lambda((@rest entries)
    let((string)
    string=""
    foreach(entry entries string=sprintf(nil "%s %L" string entry))
    printf("%s\n" string)
    ) ; let
    ); lambda
    listOfLists
    ) ; cons
    ) ; apply

    Regards,

    Andrew.


    Originally posted in cdnusers.org by adbeckett
Reply

  • Apologies, I should have used the "Quote" button at the top - my code has had the indentation stripped as a result. It should have been:

    apply('mapc
    `(lambda((@rest entries)
    let((string)
    string=""
    foreach(entry entries string=sprintf(nil "%s %L" string entry))
    printf("%s\n" string)
    ) ; let
    ); lambda
    ,@listOfLists
    ) ; end of backquote list
    ) ; apply


    and:

    apply('mapc
    cons(lambda((@rest entries)
    let((string)
    string=""
    foreach(entry entries string=sprintf(nil "%s %L" string entry))
    printf("%s\n" string)
    ) ; let
    ); lambda
    listOfLists
    ) ; cons
    ) ; apply

    Regards,

    Andrew.


    Originally posted in cdnusers.org by adbeckett
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