Re: [Tutor] Am I making this harder than it needs to be?

Ron Phillips Wed, 25 May 2005 07:07:41 -0700

Oh, thanks! That didn't exactly do the trick, because I had data like [(1, 22),(2,11)], but from your code I came up with:

    def getBB(self):
        Es=[]
        Ns=[]
        for i in range(len(self)):
            Es.append((self[i].E))
            Ns.append((self[i].N))
        self.boundingBox=geoBox((min(Es),min(Ns)),(max(Es),max(Ns)))
        return(self.boundingBox)

which works fine, and I think will be pretty fast.

Ron

>>> Pujo Aji <[EMAIL PROTECTED]> 5/25/2005 9:47 AM >>>

try this code:
    L = [(1,11),(2,22)]
    print max(L)
    print min(L)

I don't know if that what you want.

good luck
pujo

On 5/25/05, Ron Phillips <[EMAIL PROTECTED]> wrote:
>
> short version: I need a way to get max and min E and N out of
> [(E0,N0),(E1,N1)...(En,Nn)] without reordering the list
>
> long version:
>
> I would like a list of geographic coordinates (Easting, Northing) to
> maintain a "bounding box"
> [(minEasting,minNorthing),(maxEasting,maxNorthing)]
> attribute.
>
> I did it like this:
>
> class geoCoordinateList(UserList):
>     def __init__(self):
>         UserList.__init__(self)
>         self.boundingBox = geoBox(minEN=geoCoordinate(),
>                                   maxEN=geoCoordinate())
>
>     def append(self, geoCoord):
>         self.extend([geoCoord])
>         self.boundingBox.challenge(geoCoord)#bumps the max and min if
> necessary
>
> but I'd have to override almost all the UserList methods, unless there's a
> way to call boundingBox.challenge() on any change to the list.
>
> The other way I thought would be to make a getBB method, like:
>
>     def getBB(self):
>         new=geoBox()
>         for gC in self:
>             new.challenge(gC)#bumps the corners if needed
>         self.boundingBox=new
>         return(new)
>
> but that seems like a lot of churning if nothing has changed.
>
> I suspect there's some slick, readable way to do this, and when I see it
> I'll say "Doh!"
>
>
>
> _______________________________________________
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> http://mail.python.org/mailman/listinfo/tutor
>
>
>

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Re: [Tutor] Am I making this harder than it needs to be?

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