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From: Merciadri Luca on 26 Jun 2010 13:42
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"Steven Lord" <slord(a)mathworks.com> writes:

> "Merciadri Luca" <Luca.Merciadri(a)student.ulg.ac.be> wrote in message
> news:87aaqmktj8.fsf(a)merciadriluca-station.MERCIADRILUCA...
>
> *snip*
>
>> And if we go until there, we could also say that `+' is not an
>> associative operator for reals, also because of reals' machine's encoding!
>
> "In theory, there is no difference between theory and practice. In
> practice, there is."
>
> http://en.wikiquote.org/wiki/Fact_and_theory
>
> Theoretically, addition is associative. In practice, for double precision
> values, it isn't.
Well, I know that. I was not laughing: I just wanted to mention that
if you speak about such errors for matrices, this is also valid for
real numbers' addition.

- --
Merciadri Luca
See http://www.student.montefiore.ulg.ac.be/~merciadri/
- --

The secret of life is not to do what you like, but to like what you do.
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From: Bruno Luong on 26 Jun 2010 18:14
Merciadri Luca <Luca.Merciadri(a)student.ulg.ac.be> wrote in message <87mxuhelo7.fsf(a)merciadriluca-station.MERCIADRILUCA>...

> >>>
> I suppose `mmtimes' is some function you defined in some homemade
> m-file. Well, how did you proceed to find the best way to achieve the
> product? (I do not know if there is an already-established, and
> efficient algorithm for doing this; it should not be difficult to find
> a good implementation of this, though.)
>

I'm confused about your question, the mmtimes is the function I provides in post #6, and an improved version is submitted in FEX here
http://www.mathworks.com/matlabcentral/fileexchange/27950-mmtimes-matrix-chain-product

The timing is carried with FEX version.

You have replied in post #7, so why the question that sounds like from someone who has not followed the thread at all?

Bruno
From: Merciadri Luca on 28 Jun 2010 16:43
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"Bruno Luong" <b.luong(a)fogale.findmycountry> writes:

> Merciadri Luca <Luca.Merciadri(a)student.ulg.ac.be> wrote in message <87mxuhelo7.fsf(a)merciadriluca-station.MERCIADRILUCA>...
>
>> >>>
>> I suppose `mmtimes' is some function you defined in some homemade
>> m-file. Well, how did you proceed to find the best way to achieve the
>> product? (I do not know if there is an already-established, and
>> efficient algorithm for doing this; it should not be difficult to find
>> a good implementation of this, though.)
>>
>
> I'm confused about your question, the mmtimes is the function I provides in post #6, and an improved version is submitted in FEX here
> http://www.mathworks.com/matlabcentral/fileexchange/27950-mmtimes-matrix-chain-product
Well, sorry, I try to follow so much threads that I sometimes forget
answers and ask silly questions.

> The timing is carried with FEX version.
Ok.
>
> You have replied in post #7, so why the question that sounds like
> from someone who has not followed the thread at all?
That's not this at all; I now remember about your function. (I re-read
it, and it came back to my mind.) I'm sure you understand my
absentmindedness. The fact is that I even tested it partially when
receiving your answer. That makes the whole story even weirder for my memory.

- --
Merciadri Luca
See http://www.student.montefiore.ulg.ac.be/~merciadri/
- --

Education is the best provision for the journey to old age. (Aristotle)
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From: Bruno Luong on 28 Jun 2010 17:41
Merciadri Luca <Luca.Merciadri(a)student.ulg.ac.be> wrote in message <87y6dy3n35.fsf(a)merciadriluca-station.MERCIADRILUCA>...

> I'm sure you understand my
> absentmindedness.

Yeah no problem. That's happens sometime to me too when a topic is not particular of my interest or get lost inside a junk of junks.

Bruno
From: Merciadri Luca on 29 Jun 2010 04:02
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"Bruno Luong" <b.luong(a)fogale.findmycountry> writes:

> Merciadri Luca <Luca.Merciadri(a)student.ulg.ac.be> wrote in message <87y6dy3n35.fsf(a)merciadriluca-station.MERCIADRILUCA>...
>
>> I'm sure you understand my
>> absentmindedness.
>
> Yeah no problem. That's happens sometime to me too when a topic is not particular of my interest or get lost inside a junk of junks.
Sarcastic and caustic remark. This topic is not the topic which I'm
the most interested in (and same for others, I think), but that does
not justify my absentmindedness.

- --
Merciadri Luca
See http://www.student.montefiore.ulg.ac.be/~merciadri/
- --

If it's too good to be true, then it probably is.
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