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

From: The Phantom (phantom_at_aol.com)
Date: 10/13/04 

Date: Tue, 12 Oct 2004 23:07:22 -0700

On 11 Oct 2004 20:49:09 -0700, carlos@colorado.edu (Carlos Felippa) wrote:

>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.

    I think Vladimir has picked up on what the software industry calls regression testing:
http://www.softwaredioxide.com/channels/FaqView.asp?id=223

>
>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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