Re: [Numpy-discussion] float64 / int comparison different from float / int comparison

On Mon, Oct 31, 2011 at 11:23 AM, Matthew Brett <matthew.brett@gmail.com> wrote:

In [8]: np.float(2**63) == 2**63 Out[8]: True

In [9]: np.float(2**63) > 2**63-1 Out[9]: True

In [10]: np.float64(2**63) == 2**63 Out[10]: True

In [11]: np.float64(2**63) > 2**63-1 Out[11]: False

In [16]: np.float64(2**63-1) == np.float(2**63-1) Out[16]: True

Interesting. Turns out that np.float(x) returns a Python float object. If you change the experiment to only use numpy array scalars, things are more consistent: In [36]: np.array(2**63, dtype=np.float) > 2**63 - 1 Out[36]: False In [37]: np.array(2**63, dtype=np.float32) > 2**63 - 1 Out[37]: False In [38]: np.array(2**63, dtype=np.float64) > 2**63 - 1 Regards Stéfan