Subject: Re: [xsl] Random number generation : requirements From: "BR Chrisman brchrisman@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> Date: Tue, 6 May 2014 20:52:56 -0000 |
I used exslt math:random() in a Monte Carlo simulation about a year ago. iirc, it doesn't change seed under libxslt on subsequent applications of a stylesheet (I guess that's not surprising). Here I was originally using a C harness to run a bunch of transformations iteratively without serializing/deserializing a document. I found that the call was always getting the same random sequence (ostensibly it was getting the same seed). I switched that one (of about ten) transformation to a random/evaluation using C/libXML/XPath, which was oodles faster than applying that one stylesheet in an otherwise tight loop. I probably didn't even need to do that, as my simulation had a huge performance problem in that my calculated time step was orders of magnitude too small. The XSLT implementation was *far* simpler than the C/libXML/XPath version. Just my non-inflation-adjusted $0.02 On Tue, May 6, 2014 at 9:54 AM, Michael Kay mike@xxxxxxxxxxxx < xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote: > The W3C WGs are looking at the idea of introducing a random-number > function of some kind in XPath 3.1. The challenge of course is making this > both usable and a pure function with no side-effects. We have various > design ideas which we need to test against requirements. > > If you have any applications that use or need such a function, please > could I have a brief description of the way it uses random numbers, e.g. > just wanting a single random number, a random permutation of 52 integers, > an arbitrary sequence of random numebrs for test data generation, etc. > > If you're currently using the EXSLT random-sequence() function, please > share your experience with it. > > Michael Kay > Saxonica
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