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From: Toon Knapen (toon.knapen_at_[hidden])
Date: 2002-06-30 20:27:41

On Sunday 30 June 2002 12:06, David Abrahams wrote:
> I think I can shed some light on the next 2 questions. Carlos and I used to
> work together on simulation software. After much consideration, we
> discovered that for some probelms, log(N) random-access to the elements of
> a sparse matrix row was much less-important than being able to control the
> order in which the elements appeared. Being able to choose a non-sorted
> order allowed us to write the inner loop of our algorithm so that it simply
> marched through continguous addresses, writing data to consecutive
> locations in memory. In fact, this loop never had to touch the sparse
> matrix structure at all.

Can you shed even more light on this. What storage format were you using :
Harwell-Boeing, compressed-sparse row, coordinate-format, ...
and what type of algorithm were you able to optimise due to the 'unsorted'


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