Stéfan van der Walt wrote: > Hi all, > > Should we document character arrays? Does anybody still use them? > > I think their behaviour can largely be duplicated by object arrays. > They also seem to be broken: > >>>> x = np.array(['1', '2', '3', '4']).view(np.chararray) > >>>> x*3 > chararray(['111', '222', '333', '444'], > dtype='|S4') > > All good, but: > >>>> x = np.array(['12', '34', '56', '78']).view(np.chararray) > >>>> x * 3 > chararray(['1212', '3434', '5656', '7878'], > dtype='|S4') > > Whereas with object arrays: > >>>> np.array(['12', '34', '56', '78'], dtype=object) * 3 > array([121212, 343434, 565656, 787878], dtype=object) > > Similaryly: > >>>> x.rjust(3) > chararray([' a', ' b', ' c', ' d'], > dtype='|S3') > >>>> x = np.array(['a','b','c','d']).view(np.chararray) > >>>> x.rjust(3) > chararray([' a', ' b', ' c', ' d'], > dtype='|S3') > > But then > >>>> x = np.array([['ab','cd'], ['ef','gh']]).view(np.chararray) >>>> x.rjust(5) # BOOM > > Cheers > Stéfan > _______________________________________________ > Numpy-discussion mailing list > Numpy-discussion@scipy.org > http://projects.scipy.org/mailman/listinfo/numpy-discussion
I know that chararrays are used by pyfits. Chris -- Christopher Hanley Systems Software Engineer Space Telescope Science Institute 3700 San Martin Drive Baltimore MD, 21218 (410) 338-4338 _______________________________________________ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion
