2008/5/7 Eric Firing <[EMAIL PROTECTED]>: > Charles Doutriaux wrote: > > The following code works with numpy.ma but not numpy.oldnumeric.ma, > > No, this is a bug in numpy.ma also; power is broken:
While it's tempting to just call power() and mask out any NaNs that result, that's going to be a problem if people have their environments set to raise exceptions on the production of NaNs. Is it an adequate criterion to check (a<0) & (round(b)==b)? We have to be careful: In [16]: np.array([-1.0])**(2.0**128) Warning: invalid value encountered in power Out[16]: array([ nan]) 2.0**128 cannot be distinguished from nearby non-integral values, so this is reasonable behaviour (and a weird corner case), but In [23]: np.round(2.0**128) == 2.0**128 Out[23]: True Anne _______________________________________________ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion
