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Flatten the list

Sampatcharu

Hi,

Is there any default command to flatten the list?

Below is the requirement.

Input    = (1 2 3 (4 5) 6 (7 8) 9 19)

output  = (1 2 3 4 5 6 7 8 9 10)

Please help me on flattening the sub list.

Thanks,

Sampath

Parents
  • Andrew Beckett

    Sampath,

    If it is only a single level you need to flatten, you can use:

    foreach(mapcan elem input
      if(listp(elem) elem list(elem))
    )

    If it's multiple levels of list hierarchy, then it would be something like:

    procedure(CCFflattenList(lst)
      foreach(mapcan elem lst
        if(listp(elem) CCFflattenList(elem) list(elem))
      )
    )

    Note the above two weren't tested - I just typed them in as I have no access to SKILL today.

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    Sampath,

    If it is only a single level you need to flatten, you can use:

    foreach(mapcan elem input
      if(listp(elem) elem list(elem))
    )

    If it's multiple levels of list hierarchy, then it would be something like:

    procedure(CCFflattenList(lst)
      foreach(mapcan elem lst
        if(listp(elem) CCFflattenList(elem) list(elem))
      )
    )

    Note the above two weren't tested - I just typed them in as I have no access to SKILL today.

    Regards,

    Andrew.

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