Re: [Numpy-discussion] Apparently non-deterministic behaviour of complex array multiplication

2011-12-13 Thread kneil
Hi Olivier, Sorry for the late reply - I have been on travel. I have encountered the error in two separate cases; when I was using numpy arrays, and when I was using numpy matrices. In the case of a numpy array (Y), the operation is: dot(Y,Y.conj().transpose()) and in the case of a matrix, wit

Re: [Numpy-discussion] Apparently non-deterministic behaviour of complex array multiplication

2011-12-06 Thread kneil
Hi Nathaniel, The results of running memtest was a pass with no errors. -Karl Nathaniel Smith wrote: > > (You should still run memtest. It's very easy - just install it with your > package manager, then reboot. Hold down the shift key while booting, and > you'll get a boot menu. Choose memtest,

Re: [Numpy-discussion] Apparently non-deterministic behaviour of complex array multiplication

2011-12-05 Thread kneil
our > package manager, then reboot. Hold down the shift key while booting, and > you'll get a boot menu. Choose memtest, and then leave it to run > overnight.) > > - Nathaniel > On Dec 2, 2011 10:10 PM, "kneil" wrote: > > -- View this message in context:

Re: [Numpy-discussion] Apparently non-deterministic behaviour of complex array multiplication

2011-12-02 Thread kneil
it on the other computer with same specs as this one. If it runs without generating any NaN then I will proceed to a full memtest. Thanks for the advice. -Karl On Thu, Dec 1, 2011 at 2:47 PM, kneil wrote: Are you using non-ECC RAM, by chance? (Though if you have >4GB of ram, I can't

Re: [Numpy-discussion] Apparently non-deterministic behaviour of complex array multiplication

2011-12-01 Thread kneil
with same specs as this one. If it runs without generating any NaN then I will proceed to a full memtest. Thanks for the advice. -Karl Joe Kington-2 wrote: > > On Thu, Dec 1, 2011 at 2:47 PM, kneil wrote: > >> >> Hi Pierre, >> I was thinking about uploading some exa

Re: [Numpy-discussion] Apparently non-deterministic behaviour of complex array multiplication

2011-12-01 Thread kneil
Hi Pierre, I was thinking about uploading some examples but strangely, when I store the array using for example: np.save('Y',Y) and then reload it in a new workspace, I find that the problem does not reproduce. It would seem somehow to be associated with the 'overhead' of the workspace I am in..

Re: [Numpy-discussion] Apparently non-deterministic behaviour of complex array multiplication

2011-12-01 Thread kneil
Hi Oliver, indeed that was a typo, I should have used cut and paste. I was using .transpose() Olivier Delalleau-2 wrote: > > I guess it's just a typo on your part, but just to make sure, you are > using > .transpose(), not .transpose, correct? > > -=- Olivier > > 2011/11/30 Karl Kappler >