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Re: help to make code run faster (mathematica v8.01)

  • To: mathgroup at smc.vnet.net
  • Subject: [mg121363] Re: help to make code run faster (mathematica v8.01)
  • From: Ray Koopman <koopman at sfu.ca>
  • Date: Mon, 12 Sep 2011 04:22:13 -0400 (EDT)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • References: <j4fhn1$2em$1@smc.vnet.net> <j4i6a7$c0a$1@smc.vnet.net>

On Sep 11, 4:33 am, Ray Koopman <koop... at sfu.ca> wrote:
>
> Think in terms of vectors:
>
> 1.5 Times @@ Transpose@Subsets[fit["FitResiduals"],{2}] .
>   Clip[1. - ((Subtract @@ Transpose@Subsets[reg,{2}])/h)^2, {0.,1.}]

This is about 10% faster. There are several variants of this that are
just about as fast, so experiment a little.

(-1.5/h^2) Times @@ Transpose@Subsets[fit["FitResiduals"],{2}] .
  Clip[(Subsets[reg,{2}].{1.,-1.})^2 - h^2, {-h^2,0.}]




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