Last Sylvester there was a thread on Matrix Multiplication in XQuery: http://markmail.org/message/7q7qnbbnjo7cljzv?q=list:com.x-query.talk+matrix +multiplication
The biggest problem identified was that XQuery does not allow for efficient representation of 2+dimensional arrays. JSON does provide 2+dimensional arrays for free. I did not measure performance yet, but this JSONiq script looks very similar to what would be done in C: http://try.zorba.io/queries/xquery/jFd3Q8f82HuZGzcYDzQpdN4SdfY= declare variable $A := [ [1,2], [3,4], [5,6], [7,8] ]; declare variable $B := [ [1,2,3], [4,5,6] ]; [ for $i in 1 to count(jn:members($A)) return [ for $k in 1 to count(jn:members($B(1))) return fn:sum( for $j in 1 to count(jn:members($B)) return $A($i)($j) * $B($j)($k) ) ] ] And much simpler than in XSLT: http://rosettacode.org/wiki/Matrix_multiplication#XSLT_1.0: Mit besten Gruessen / Best wishes, Hermann Stamm-Wilbrandt Level 3 support for XML Compiler team and Fixpack team lead WebSphere DataPower SOA Appliances https://www.ibm.com/developerworks/mydeveloperworks/blogs/HermannSW/ https://twitter.com/HermannSW/ http://stamm-wilbrandt.de/GraphvizFiddle/ ---------------------------------------------------------------------- IBM Deutschland Research & Development GmbH Vorsitzende des Aufsichtsrats: Martina Koederitz Geschaeftsfuehrung: Dirk Wittkopp Sitz der Gesellschaft: Boeblingen Registergericht: Amtsgericht Stuttgart, HRB 243294 _______________________________________________ [email protected] http://x-query.com/mailman/listinfo/talk
