Thomas ha scritto:
Greetings
I am having a darn awful time trying to update a matrix:
row = dict([(x,0) for x in range(3)])
matrix = dict([(x,row) for x in range(-3,4,1)])
matrix[2][1] += 1
matrix[-1][2] += 1
"""
Got: a 1 in all col 1 and 2
{-3: {0: 0, 1: 1, 2: 1},
-2: {0: 0, 1: 1, 2: 1},
-1: {0: 0, 1: 1, 2: 1},
0: {0: 0, 1: 1, 2: 1},
1: {0: 0, 1: 1, 2: 1},
2: {0: 0, 1: 1, 2: 1},
3: {0: 0, 1: 1, 2: 1}}
Expected: a 1 in row 2 col 1 and row -1 col 2
{-3: {0: 0, 1: 0, 2: 0},
-2: {0: 0, 1: 0, 2: 0},
-1: {0: 0, 1: 0, 2: 1},
0: {0: 0, 1: 0, 2: 0},
1: {0: 0, 1: 0, 2: 0},
2: {0: 0, 1: 1, 2: 0},
3: {0: 0, 1: 0, 2: 0}}
"""
I must be doing something wrong. Researched and researched. Nothing
clicks.
clone the row:
>>> row = dict([(x,0) for x in range(3)])
>>> import copy
>>> matrix = dict([(x,copy.copy(row)) for x in range(-3,4,1)])
>>> matrix[2][1] += 1
>>> matrix[-1][2] += 1
>>> import pprint
>>> pp = pprint.PrettyPrinter()
>>> pp.pprint(matrix)
{-3: {0: 0, 1: 0, 2: 0},
-2: {0: 0, 1: 0, 2: 0},
-1: {0: 0, 1: 0, 2: 1},
0: {0: 0, 1: 0, 2: 0},
1: {0: 0, 1: 0, 2: 0},
2: {0: 0, 1: 1, 2: 0},
3: {0: 0, 1: 0, 2: 0}}
>>>
bye
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