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Topic: dumb matrix question
Replies: 8   Last Post: May 12, 2011 3:14 AM

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Eli Osherovich

Posts: 37
Registered: 6/5/05
Re: dumb matrix question
Posted: May 12, 2011 3:14 AM
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On 05/12/2011 03:44 AM, robin wrote:
> "Eli Osherovich"<eli.osherovich@gmail.com> wrote in message news:iqdgc8$5la$1@dont-email.me...
> | By the way, I do not know whether you prefer speed over short (and
> | elegant?) code, however, in the past I ran extensive speed tests for a
> | close problem: multiplying all matrix *columns* by a scalar. The fastest
> | way was to use an explicit loop.
>
> Since you were, in effect, multipying the entire array by a scalar,
> the fastest way would be to overlay a vector over the entire array
> and to multiply that by the scalar.
>
>

Robin, I am afraid your message is not clear to me. Algebraically, my
function computed A*D, where D was a diagonal matrix.




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