Re: Mathematica 7.0 slow on OS X

*To*: mathgroup at smc.vnet.net*Subject*: [mg93790] Re: Mathematica 7.0 slow on OS X*From*: Xerxes <saul.cohen at gmail.com>*Date*: Wed, 26 Nov 2008 05:11:07 -0500 (EST)*References*: <ggdqpu$k0$1@smc.vnet.net> <gggqgf$32k$1@smc.vnet.net>

On Nov 25, 7:19 am, jsk... at gmail.com wrote: > > The main culprit is the next-to-last test (Binomial[m, k]) which > jumps from 25.4s to 376.7s. I confirm this behavior (under Windows XP). However, this Binomial test does not appear to be doing anything. For values of k>5, the Binomial objects will not resolve without application of FunctionExpand. The test is simply generating a sum of ten million unexpanded Binomial terms. Why that should be a factor of 10 slower under 7 is an interesting question, but it's certainly not the kind of task anybody would want to perform in a real calculation. If I cut the 10^7 binomials down to a manageable 10^3 and actually expand them, I find that 7 improves on the performance of 6 by about 3%. Saul Cohen