On 02/08/2012 09:31 PM, teomat wrote: > > Hi, > > Am I wrong or the numpy.arange() function is not correct 100%? > > Try to do this: > > In [7]: len(np.arange(3.1, 4.9, 0.1)) > Out[7]: 18 > > In [8]: len(np.arange(8.1, 9.9, 0.1)) > Out[8]: 19 > > I would expect the same result for each command.
Not after more experience with the wonders of floating point! Nice-looking decimal numbers often have long, drawn-out, inexact floating point (base 2) representations. That leads to exactly this sort of problem. numpy.linspace is provided to help get around some of these surprises; or you can use an integer sequence and then scale and shift it. Eric > > All the best > > _______________________________________________ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
