Eric> I think you can do
Eric> mylist = [[]] or somesuch...
That won't do what you want. You've defined a list with a single element
(another list). You might have been thinking of something like this:
>>> N = 4
>>> M = 5
>>> mylist = [[0.0] * M] * N
While to the casual glance it looks like what you want:
>>> print mylist
[[0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0,
0.0], [0.0, 0.0, 0.0, 0.0, 0.0]]
assigning to an element of this structure demonstrates its shortcoming:
>>> mylist[1][1] = 42.7
>>> print mylist
[[0.0, 42.700000000000003, 0.0, 0.0, 0.0], [0.0, 42.700000000000003, 0.0,
0.0, 0.0], [0.0, 42.700000000000003, 0.0, 0.0, 0.0], [0.0, 42.700000000000003,
0.0, 0.0, 0.0]]
There is just one copy of [0.0] * M referenced N times.
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