Re: Is ther any sense in *= and matrices?

["David C. Hoos" <david.c.hoos.sr@ada95.com>]

"Wesley Groleau" <wesgroleau@despammed.com> wrote in message
news:qgqdnUqY3I2EBEKjXTWcpg@gbronline.com...
>
> >>I mean even if one define "*" for Matrix_Type one cannot do:
> >>
> >>  A := A * B
> >
> > You can, iff A and B are square matrices.
>
> But you cannot do it efficiently "in-place"
> because each element in the result is the sum
> of multiply operators on several pairs of
> elements in the two addends.  So if I compute

The operands of * are called "factors", not "addends."

>
> A(1,1) before A (1,2) then the latter has already
> had one of its inputs changed.  To overcome this
> without introducing a temporary "A" one would
> require a rather complicated set of temporary
> _parts_ of A.
>
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