2007/1/16, Carlos <[EMAIL PROTECTED]>:
Hello to everybody,
I have a question that I think is a little related to clustering, I have
a list of lists, like this:
List = [[1,5],[6,8],[48,10],[99,56]]
The list is composed by a large number of lists not just four, and each
'interior' list contains two numbers that are the location of an object
in a plane, so they are X and Y coordinates, my question is:
Can I use this list to evaluate how many points are in a given range?
Thats is taking the highest and lowest values for X an Y and, lets say
divide that range in 10 regions, then get the number of objects on each
region. Is this possible? and if yes, how canI do it? I ask this because
as you know my python skills are not that great :)
First, this feels like a list of tuples rather than a list of lists;
however, tuples and lists don't differ that much in their behaviour, so
there's nothing really lost.
And yes, it is possible. An inline if would be the way I would resolve that:
def withinrange(list,xmin,xmax,ymin,ymax):
# Get the elements of list for which the first part of the pair is
between xmin and xmax
# (inclusive) and the second between ymin and ymax.
return [c for c in list if xmin <= c[0] <= xmax and ymin <= c[1] <=
ymax]
The longer but clearer method of doing the same would be:
def withinrange(list,xmin,xmax,ymin,ymax):
templist = []
for c in list:
if xmin <= c[0] <= xmax and ymin <= c[1] <= ymax:
templist.append(c)
return templist
--
Andre Engels, [EMAIL PROTECTED]
ICQ: 6260644 -- Skype: a_engels
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