David Cournapeau wrote: > On Thu, Oct 29, 2009 at 10:26 PM, Dag Sverre Seljebotn > <[email protected]> wrote: > >> I'm getting (to me( very mysterious NaNs when doing matrix >> multiplication with certain (randomly generated) data: >> >> In [52]: a.shape, b.shape, i, j >> Out[52]: ((22, 1000), (1000, 22), 0, 16) >> >> In [53]: np.dot(a, b)[i,j] >> Out[53]: (31.322778824758661+nan*j) >> >> In [54]: np.dot(a[i,:], b[:,j]) >> Out[54]: (31.322778824758657+6.5017268607881213j) >> >> In [55]: np.any(np.isnan(a)), np.any(np.isnan(b)) >> Out[55]: (False, False) >> >> In [63]: np.max(np.abs(np.vstack((a.real, a.imag, b.real.T, b.imag.T)))) >> Out[63]: 4.0744710639852633 >> >> dtype is complex128. Is this a bug? Should I start looking in NumPy, >> ATLAS (Sage-compiled), the C compiler, the Fortran compiler...*shrug* >> > > Most likely an atlas bug. Which version of atlas are you using, on which cpu ? > Thanks.
Sage reports atlas-3.8.3.p7. Intel(R) Xeon(TM) CPU 3.20GHz, 64-bit RedHat Linux. Dag Sverre _______________________________________________ NumPy-Discussion mailing list [email protected] http://mail.scipy.org/mailman/listinfo/numpy-discussion
