Re: Unequal results when using element-wise and broadcast

[Sergei Steshenko]

>________________________________
> From: Pantxo Diribarne <address@hidden>
>To: address@hidden; Octave Help <address@hidden>; Mike Miller <address@hidden> 
>Sent: Friday, November 22, 2013 8:13 PM
>Subject: Re: Unequal results when using element-wise and broadcast
> 
>
>Hello,
>
>It also fails for me with current dev version.
>
>The weird thing is that it is due to "tol = 0" instead of "eps". See the 
>exerpt (all differences are within eps):
>
>error: ASSERT errors for:  assert (C,C3)
>
>   Location  |  Observed  |  Expected  |  Reason
>     (7)        0.63854      0.63854      Abs err 1.1102e-16 exceeds tol 0
>     (11)      0.00091156   0.00091156    Abs err 1.0842e-19 exceeds tol 0
>     (13)       0.15896      0.15896      Abs err 2.7756e-17 exceeds tol 0
>
>
>Pantxo
>_______________________________________________
>
>
>

This can be a manifestation of 80 <-> 64 bit x86 FP numbers, and 
absence/presence of failure may depend on 32/64 bit machine. AFAIR 64 bit 
machines work only with 64 bit FP numbers while on 32 bit machines FP registers 
are 80 bit, but data in memory is stored as 64 bit.

Regards,
  Sergei.