Are you saying the spec as it stands somehow forces all implementations to be 1000x slower, or just what you have observed in some particular implementation?
On 31 Dec 2013 14:27, "jean-marc Mercier" <[email protected]> wrote: > > As far as I understand, you want to write a linear algebra module using XQUERY ? > If so, I opened a thread some months ago about this idea. My opinion today is that this is a false good idea at present time. > > 1) XQUERY would be really good for writing concise, efficient linear algebra modulus. > 2) However, I strongly recommend to wait a little bit for starting coding : the current version of XQUERY (3.0) suffers from performance issues. A linear algebra modulus written in XQUERY is expected to have performances performances 1000 X slower than its corresponding C++ or JAVA (you can measure it precisely). Any mathematician linear algebra modulus would probably trashed your modulus after the first test. > > Hope this helps > > > > 2013/12/31 Ihe Onwuka <[email protected]> >> >> Assuming a sparse representation it is about 4 lines of SQL. This is known not least because you can read enough articles and papers that discuss it and it optimises well. The obvious google search does not reveal any corresponding XQuery discussion, neither does it appear to have surfaced on this or the eXist mailing list (allowing for my deficient search skills). For something so "trivial" I thought that was rather strange. Hence I thought it would be prudent to ask before naively embarking on a 600k X 40k matrix multiplication. >> >> >> >> On Tue, Dec 31, 2013 at 11:31 AM, Andrew Welch <[email protected]> wrote: >>> >>> >>> It should be pretty trivial... >>> >>> On 31 Dec 2013 11:07, "Ihe Onwuka" <[email protected]> wrote: >>> > >>> > Has anybody tried this in XQuery or if I am so foolish (not yet but give me time) would I be the courageous <culturalReference> http://www.youtube.com/watch?v=ik8JT2S-kBE</culturalReference> early adopter. >>> > >>> > >>> > _______________________________________________ >>> > [email protected] >>> > http://x-query.com/mailman/listinfo/talk >> >> >> >> _______________________________________________ >> [email protected] >> http://x-query.com/mailman/listinfo/talk > >
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