I need to do some statistical analysis by binning values into an array.
Being new to Python, I tried to use a list of lists. I've extracted just the
minimum code that I'm having trouble with:
def testanalysis():
IP = []
temp = [[0, 0, 0],[0, 0, 0],[0, 0, 0]]
# initialize to zero
for i in range(20):
IP.append(temp)
# increment each of the first five elements by 1
for index in range(5):
for type in range(3):
for phase in range(3):
IP[index][type][phase] += 1
print IP
The output is:
[[[5, 5, 5], [5, 5, 5], [5, 5, 5]], [[5, 5, 5], [5, 5, 5], [5, 5, 5]], [[5, 5,
5], [5, 5, 5], [5, 5, 5]], [[5, 5, 5], [5, 5, 5], [5, 5, 5]], [[5, 5, 5], [5,
5, 5], [5, 5, 5]], [[5, 5, 5], [5, 5, 5], [5, 5, 5]], [[5, 5, 5], [5, 5, 5],
[5, 5, 5]], [[5, 5, 5], [5, 5, 5], [5, 5, 5]], [[5, 5, 5], [5, 5, 5], [5, 5,
5]], [[5, 5, 5], [5, 5, 5], [5, 5, 5]], [[5, 5, 5], [5, 5, 5], [5, 5, 5]], [[5,
5, 5], [5, 5, 5], [5, 5, 5]], [[5, 5, 5], [5, 5, 5], [5, 5, 5]], [[5, 5, 5],
[5, 5, 5], [5, 5, 5]], [[5, 5, 5], [5, 5, 5], [5, 5, 5]], [[5, 5, 5], [5, 5,
5], [5, 5, 5]], [[5, 5, 5], [5, 5, 5], [5, 5, 5]], [[5, 5, 5], [5, 5, 5], [5,
5, 5]], [[5, 5, 5], [5, 5, 5], [5, 5, 5]], [[5, 5, 5], [5, 5, 5], [5, 5, 5]]]
What I wanted, of course, is to increment only the first 5 sub-lists to a value
of 1 (not 5).
I'm obviously misunderstanding something fundamental about lists, list
indexing, or both.
Is this enough information for someone to point out what I'm doing wrong?
Mike_______________________________________________
Tutor maillist - Tutor@python.org
http://mail.python.org/mailman/listinfo/tutor
