Re: [mma] GEMM: Selected Mathematica 5.0.1 Bugs - 4

From: Carlos Felippa (carlos_at_colorado.edu)
Date: 10/12/04 

Date: 11 Oct 2004 20:49:09 -0700

vb@cybertester.com (Vladimir Bondarenko) wrote in message news:<n4m5hpg001z2@legacy>...
> On 3 Oct 2004 10:52:01 -0700, Carlos Felippa wrote:
> >vb@cybertester.com (Vladimir Bondarenko) wrote in message
> news:<mh7rq5aa4zc2@legacy>...
>
>
> CF> Works fine in an older version (which I use because of stability):
>
>
> Even more, it works correctly in Mathematica 4.1, Mathematica 4.0, and
> Mathematica 3.0. There is no function FullSimplify in Mathematica 2.2.
>
> But in Mathematica 5.0.1 we observe a critical bug for this input.
>
> This type of software bugs is called REGRESSION BUG (older version(s)
> work well, a newer version fails).
>

Minor terminology correction: "regression" has a different meaning in
English: return to a previous (less perfect) state.

If a bug wasnt present in a previous version it is just a new bug.
The kind you noticed is often an interface or address spillover bug.
If one programs in raw C or C++ those happen all the time with minor
code changes because of the lack of interface and memory allocation
controls.

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