29356 2016-01-03 21:30:29 +0000 Add fn:product 2016-01-03 23:35:46 +0000 1 1 1 Unclassified XPath / XQuery / XSLT Requirements for Future Versions Working drafts PC Linux NEW P2 normal --- 1 benito jim.melton mike public-qt-comments oldest_to_newest 124509 0 benito 2016-01-03 21:30:29 +0000 There is a fn:sum, but no fn:product That does not seem intuitive. Both are the basic commutative arithmetic operations, there should either be both or neither. It is also very useful to calculate the factorial: product(1 to $something) From that you can define the binomial (which could also be useful in the math: module): declare function binomial($n, $k) { product(($k + 1) to $n) div product(1 to (n - k)) } and work with combinatorics and stuff 124511 1 mike 2016-01-03 23:24:59 +0000 It's very easy to define it yourself: let $product := fold-left(?, 1, function($x, $y){$x * $y}) 124512 2 benito 2016-01-03 23:35:46 +0000 But so is fn:sum and that is there And utility functions seem to have become popular again, like fn:contains-token