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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