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Create a two-dimensional array at runtime: Difference between revisions

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Create a two-dimensional array at runtime (view source)

Revision as of 10:55, 27 February 2009

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Line 361:
{{works with|Python| 2.5}}
 
<lang python> width = int(raw_input("Width of myarray: "))
height = int(raw_input("Height of Array: "))
myarray = [[0] * width for i in xrange(height)]
myarray[0][0] = 3.5
print myarray[0][0]</lang>
 
'''Note:''' Some people may instinctively try to write myarray as [[0] * width] * height, but the * operator creates ''n'' references to [[0] * width]
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You can also use a two element tuple to index a dictionary like so:
 
<lang python> myarray = dict(((w,h), 0) for w in range(width) for h in range(height))
# or, in Python 3: myarray = {(w,h): 0 for w in range(width) for h in range(height)}
myarray[(0,0)] = 3.5▼
print myarray[(0,0)]</lang> = 3.5
▲ print myarray[(0,0)] = 3.5</lang>
 
=={{header|Ruby}}==
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