On 10/14/11 5:04 AM, Neal Becker wrote:
suppose I have:
In [10]: u Out[10]: array([[0, 1, 2, 3, 4], [5, 6, 7, 8, 9]])
And I have a vector v: v = np.array ((0,1,0,1,0))
I want to form an output vector which selects items from u where v is the index of the row of u to be selected.
Now, more importantly, I need the result to be a reference to the original array (not a copy), because I'm going to use it on the LHS of an assignment. Is this possible?
No, it's not. numpy arrays need to be describable with regular strides -- when selecting arbitrary elements from an array, there is no way to describe the resulting array as regular strides into the same data block as the original. -Chris -- Christopher Barker, Ph.D. Oceanographer Emergency Response Division NOAA/NOS/OR&R (206) 526-6959 voice 7600 Sand Point Way NE (206) 526-6329 fax Seattle, WA 98115 (206) 526-6317 main reception Chris.Barker@noaa.gov