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<p class="MsoNormal" style="margin-left:.5in">On 31 Dec 2013 17:03, "jean-marc Mercier" <<a href="mailto:jeanmarc.mercier@gmail.com">jeanmarc.mercier@gmail.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in">@David pairs are also basically needed to write a linear algebra modulus, the topic of this thread. And XQUERY don't provide any efficient pair. You can't use Marklogic map, or any other vendor map to store vectors
for performance issues (a map is really slow).<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><a href="http://x-query.com/mailman/listinfo/talk" target="_blank">http://x-query.com/mailman/listinfo/talk</a><o:p></o:p></p>
<p class="MsoNormal"><b><i><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">[DAL:]
<o:p></o:p></span></i></b></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Just an FYI but MarkLogic also have native arrays (in addition to maps) which are extremely efficient (they are stored internally as C arrays).<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">But if you have to do a lot of iterating through the arrays - even though the accessors are very efficient ,<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">the surrounding FLOWR code is still XQuery which slows things down a bit. Maybe or maybe not enough to make them not useful for you.<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Also the marklogic maps are not the same as XQuery 3 implemented maps, they are a hash map under the hood and typically linear access.<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">But back to your original issue, these are vendor extensions and hence not portable to other implementations (Until XQuery itself
<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">standardizes on arrays and maps - then it is likely that vendor extension implementations will be used to expose the standard interface).<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">If what you want is pure XQuery ... it doesnt matter how fast these are if you cant use them because they dont exist in all implementations.<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">-David<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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