[Numpy-discussion] Matrix Class

[Ryan Nelson]

So:

In [2]: np.mat([4,'5',6])
Out[2]:
matrix([['4', '5', '6']], dtype='<U11')

In [3]: np.mat([4,'5',6], dtype=int)
Out[3]: matrix([[4, 5, 6]])



On Tue, Feb 10, 2015 at 5:07 PM, cjw <cjw at ncf.ca> wrote:

> 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]]
> >>>
>
>
>
>
>
> --
> View this message in context:
> http://numpy-discussion.10968.n7.nabble.com/Matrix-Class-tp39719.html
> Sent from the Numpy-discussion mailing list archive at Nabble.com.
> _______________________________________________
> NumPy-Discussion mailing list
> NumPy-Discussion at scipy.org
> http://mail.scipy.org/mailman/listinfo/numpy-discussion
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/numpy-discussion/attachments/20150211/f3e107d5/attachment.html>