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ANDing 2 lists

blankman
Hi All, I have 2 lists below. I am looking to AND them together to get a 3rd list containing only the coordinates of bslist2 that correspond to the values of 't' in bslist1. What is the best way to go about this?

Thanks,

Brian.

bslist1 = (nil nil nil nil nil t t t t)

bslist2 = ((106.64 64.105) (106.64 69.895) (117.09 69.895) (117.09 63.54) (111.135 63.54) (111.135 67.755) (114.9 67.755) (114.9 66.35) (113.045 66.35))
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  • I'm not sure how you want to store your results, but here is one way to do it:

    procedure(myListAnd(list1 list2)
      let((pointList)
        foreach((subList1 subList2) list1 list2
            foreach((flag point) subList1 subList2
                when(flag
                    println(point)
                    pointList = cons(point pointList)
                )
            )
        )
        pointList
      ) ;let
    ) ;proc

    myListAnd(bspartselobjvalidlist bspartselobjpointlist)

    Derek

Reply

  • I'm not sure how you want to store your results, but here is one way to do it:

    procedure(myListAnd(list1 list2)
      let((pointList)
        foreach((subList1 subList2) list1 list2
            foreach((flag point) subList1 subList2
                when(flag
                    println(point)
                    pointList = cons(point pointList)
                )
            )
        )
        pointList
      ) ;let
    ) ;proc

    myListAnd(bspartselobjvalidlist bspartselobjpointlist)

    Derek

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