On Wed, Jan 4, 2012 at 5:29 PM, Dominik Szczerba <span dir="ltr"><<a href="mailto:dominik@itis.ethz.ch">dominik@itis.ethz.ch</a>></span> wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Do you think this issue can potentially explain a behavior I observe:<br>
<br>
In my big block shell matrix there are two blocks submatrices: (say) B<br>
and B transposed. MaxAbs is exact same for both submatrices, MinAbs is<br>
zero for B (as expected), but small negative for the other<br>
(unexpected).<br>
<br>
Now question: do I have a bug (that I do not immediately see) or this<br>
can be hopefully only a trick in MinAbs?<br></blockquote><div><br></div><div>It was a bug in MinAbs. I am pushing the fix.</div><div><br></div><div> Matt</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Thanks a lot.<br>
<br>
On Wed, Jan 4, 2012 at 6:05 PM, Jed Brown <<a href="mailto:jedbrown@mcs.anl.gov">jedbrown@mcs.anl.gov</a>> wrote:<br>
> On Wed, Jan 4, 2012 at 11:02, Matthew Knepley <<a href="mailto:knepley@gmail.com">knepley@gmail.com</a>> wrote:<br>
>><br>
>> Okay, here is what is wrong with the logic:<br>
>><br>
>> 1) Its not a shift, it ignores values < 1.0e-12<br>
><br>
><br>
> you wrote that in the commit message<br>
><br>
>><br>
>><br>
>> 2) The problem is on line 2.17 of the diff where it takes the first value<br>
>> as minimum, but does not take the absolute value<br>
><br>
><br>
> good catch<br>
</blockquote></div><br><br clear="all"><div><br></div>-- <br>What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br>
-- Norbert Wiener<br>