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Reformatting of a list

Frederic Drape

Hi everybody,

I have a list that look something like that:

list1 = list(list("a" "1" "1") list("a" "1" "2") list("a" "2" "3") list("b" "5" "5") list("b" "5" "6") list("b" "7" "8"))

and I want this list to be reformatted to look like that:

list2 = list(list("a" list("1,1" "1,2" "2,3")) list("b" list("5,5" "5,6" "7,8")))


Anybody have an elegant way of doing that???

Thanks

Fred

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  • dmay

    First of all, the numbers would not be quoted strings.

    Secondly, a list of coordinates is essentially a list of list-pairs. The coordinates "1,1" "1,2" "2,3" would be represented in lists like this:
    list(list(1 1) list(1 2) list(2 3))

    Skill allows you to simplify a coordinate list-pair with a colon, so a simpler implementation of the above is:
    list(1:1 1:2 2:3)

    Therefore, your table could simply be:
    tbl["a"] = list(1:1 1:2 2:3)
    tbl["b"] = list(5:5 5:6 7:8)

    Since these are numbers, you could provide this list of points to dbCreatePolygon directly. In your string based example, you'd have to parse the data to produce usable coordinates for other Skill commands.

    Derek

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  • dmay

    First of all, the numbers would not be quoted strings.

    Secondly, a list of coordinates is essentially a list of list-pairs. The coordinates "1,1" "1,2" "2,3" would be represented in lists like this:
    list(list(1 1) list(1 2) list(2 3))

    Skill allows you to simplify a coordinate list-pair with a colon, so a simpler implementation of the above is:
    list(1:1 1:2 2:3)

    Therefore, your table could simply be:
    tbl["a"] = list(1:1 1:2 2:3)
    tbl["b"] = list(5:5 5:6 7:8)

    Since these are numbers, you could provide this list of points to dbCreatePolygon directly. In your string based example, you'd have to parse the data to produce usable coordinates for other Skill commands.

    Derek

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