Re: Complexity explosion in linear solve
- To: mathgroup at smc.vnet.net
- Subject: [mg80262] Re: Complexity explosion in linear solve
- From: carlos at colorado.edu
- Date: Thu, 16 Aug 2007 04:42:28 -0400 (EDT)
- References: <200708141107.HAA09644@smc.vnet.net><f9ueas$b9n$1@smc.vnet.net>
> > Try Method->"OneStepRowReduction" (without quotes, if in versions < 6) and > see if that helps. > > I get (after suitably redefining b so it is not self-referential, and > changing A to mat) > > In[8]:= Timing[ > x = LinearSolve[mat, b, Method -> "OneStepRowReduction"];] > > During evaluation of In[8]:= LinearSolve::nosol: Linear equation \ > encountered that has no solution. > > Out[8]= {0.15, Null} > > Probably not the anticipated solution, but it is quick and short. > > Daniel Lichtblau > Wolfram Research When I tried that option under version 5.2 for Mac OS X, the expression returns unevaluated. I could not find documentation for it; what does it do? I had loaded 6.0 in July, from the CU campus license, but discarded it after showing too unstable - kept freezing, had to kill it manually.
- References:
- Complexity explosion in linear solve
- From: carlos@colorado.edu
- Complexity explosion in linear solve