Pardon the noise. The behavior is described right there in the documentation of broadcast_arrays.
Kindest regards, Tim On Sun, Aug 25, 2013 at 8:53 PM, Cera, Tim <[email protected]> wrote: > Figured it out. I created 'day' as a broadcast array. Does this > catch other people? Basically changing day[0] would change the entire > 'day' array. I guess all other elements of the day array are views of > day[0]. Made a copy and everything works as expected. > > Kindest regards, > Tim > > On Sun, Aug 25, 2013 at 8:44 PM, Eric Firing <[email protected]> wrote: >> On 2013/08/25 2:30 PM, Cera, Tim wrote: >>> I have done this before, but am now really confused. >>> >>> Created an array 'day' specifying the 'f' type >>> >>> In [29]: day >>> Out[29]: array([ 5., 5.], dtype=float32) >>> >>> # Have a mask... >>> In [30]: mask >>> Out[30]: array([ True, False], dtype=bool) >>> >>> # So far, so good... >>> In [31]: day[mask] >>> Out[31]: array([ 5.], dtype=float32) >>> >>> In [32]: day[mask] = 10 >>> >>> # What? >>> In [33]: day >>> Out[33]: array([ 10., 10.], dtype=float32) >> >> I'm not getting that with 1.7.0: >> In [2]: np.__version__ >> Out[2]: '1.7.0' >> >> In [3]: mask = np.array([True, False], dtype=bool) >> >> In [4]: day = np.array([5, 5], dtype=np.float32) >> >> In [5]: day >> Out[5]: array([ 5., 5.], dtype=float32) >> >> In [6]: mask >> Out[6]: array([ True, False], dtype=bool) >> >> In [7]: day[mask] >> Out[7]: array([ 5.], dtype=float32) >> >> In [8]: day[mask] = 10 >> >> In [9]: day >> Out[9]: array([ 10., 5.], dtype=float32) >> >> Eric >> >> >>> >>> >>> So I created an integer array 'a' >>> >>> In [38]: a >>> Out[38]: array([11, 1]) >>> >>> In [39]: a[mask] >>> Out[39]: array([11]) >>> >>> In [40]: a[mask] = 12 >>> >>> # This is what I expect. >>> In [41]: a >>> Out[41]: array([12, 1]) >>> >>> Am I missing something? Is this supposed to happen? >>> >>> Version 1.7.1. >>> >>> Kindest regards, >>> Tim >>> _______________________________________________ >>> NumPy-Discussion mailing list >>> [email protected] >>> http://mail.scipy.org/mailman/listinfo/numpy-discussion >>> >> >> _______________________________________________ >> NumPy-Discussion mailing list >> [email protected] >> http://mail.scipy.org/mailman/listinfo/numpy-discussion _______________________________________________ NumPy-Discussion mailing list [email protected] http://mail.scipy.org/mailman/listinfo/numpy-discussion
