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
