Created
February 25, 2012 02:51
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Multi-dimensional Array Initilization
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| k = 1 | |
| r = 3 | |
| c = 5 | |
| # Correct way | |
| A = [[ k ] * c for i in range(r)] | |
| A[0][3] = 0 | |
| #>>> A | |
| #[[1, 1, 1, 0, 1], [1, 1, 1, 1, 1], [1, 1, 1, 1, 1]] | |
| # Wrong way - * performs shallow copy, and list are references | |
| A = [[ k ] * c] * 3 | |
| A[0][3] = 0 | |
| #>>> A | |
| #[[1, 1, 1, 0, 1], [1, 1, 1, 0, 1], [1, 1, 1, 0, 1]] |
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