[Numpy-discussion] Matrix Class

cjw cjw at ncf.ca
Tue Feb 10 17:07:54 EST 2015


It seems to be agreed that there are weaknesses in the existing Numpy Matrix
Class.

Some problems are illustrated below.

I'll try to put some suggestions over the coming weeks and would appreciate
comments.

Colin W.

Test Script:

if __name__ == '__main__':
    a= mat([4, 5, 6])                   # Good
    print('a: ', a)
    b= mat([4, '5', 6])                 # Not the expected result
    print('b: ', b)
    c= mat([[4, 5, 6], [7, 8]])         # Wrongly accepted as rectangular
    print('c: ', c)
    d= mat([[1, 2, 3]])
    try:
        d[0, 1]= 'b'                    # Correctly flagged, not numeric
    except ValueError:
        print("d[0, 1]= 'b'             # Correctly flagged, not numeric", '
ValueError')
    print('d: ', d)

Result:

*** Python 2.7.9 (default, Dec 10 2014, 12:28:03) [MSC v.1500 64 bit
(AMD64)] on win32. ***
>>> 
a:  [[4 5 6]]
b:  [['4' '5' '6']]
c:  [[[4, 5, 6] [7, 8]]]
d[0, 1]= 'b'             # Correctly flagged, not numeric  ValueError
d:  [[1 2 3]]
>>> 





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