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List -> list containing even indexes

Slawa

 Hello

How it is possible to receive list consisting only from members of initial list with even or odd indexes? For example there is a list containing 7 Cadence database members. How to receive list containing first, third, fifth and seventh members? 

Best regards

Slawa

Parents

  • Hi Slawa,

    How about the following? 

    myList = '(1 2 3 4 5 6 7 8)
=> (1 2 3 4 5
    6 7 8
   )
idx = 0
setof(elem foreach(mapcar item myList evenp(idx++)&&item) elem)
=> (1 3 5 7)

    This iterates over the list using foreach mapcar and the result would look like (1 nil 3 nil ...) and then the setof filters this list to remove any 'nil' values.  The input list does not have to be numeric, only the variable idx is required to be numeric. Change the evenp predicate to oddp if the even indexes are needed.

    Regards,

    Lawrence.

Reply

  • Hi Slawa,

    How about the following? 

    myList = '(1 2 3 4 5 6 7 8)
=> (1 2 3 4 5
    6 7 8
   )
idx = 0
setof(elem foreach(mapcar item myList evenp(idx++)&&item) elem)
=> (1 3 5 7)

    This iterates over the list using foreach mapcar and the result would look like (1 nil 3 nil ...) and then the setof filters this list to remove any 'nil' values.  The input list does not have to be numeric, only the variable idx is required to be numeric. Change the evenp predicate to oddp if the even indexes are needed.

    Regards,

    Lawrence.

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