Alan G Isaac wrote:
One thing keeps bugging me when I use numpy.matrix.
All this is fine::
>>> x=N.mat('1 1;1 0') >>> x matrix([[1, 1], [1, 0]]) >>> x[1,:] matrix([[1, 0]])
But it seems to me that I should be able to extract a matrix row as an array.
This can easily be done: *** Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit (Intel)] on win32. ***
import numpy as _n A= _n.mat([[1, 2], [3, 4]]) A[1] matrix([[3, 4]]) A[1].getA1() array([3, 4])
An array and a matrix are different animals. Conversion from one to the other should be spelled out. As you have done below. Colin W.
So this ::
>>> x[1] matrix([[1, 0]])
feels wrong. (Similarly when iterating across rows.) Of course I realize that I can just ::
>>> x.A[1] array([1, 0])
but since the above keeps feeling wrong I felt I should raise this as a possible design issue, better discussed early than latter.
Cheers, Alan Isaac