Re: Complexity explosion in linear solve
- To: mathgroup at smc.vnet.net
- Subject: [mg80288] Re: Complexity explosion in linear solve
- From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
- Date: Thu, 16 Aug 2007 07:22:18 -0400 (EDT)
- Organization: The Open University, Milton Keynes, UK
- References: <200708141107.HAA09644@smc.vnet.net><f9ueas$b9n$1@smc.vnet.net> <fa12qe$mn6$1@smc.vnet.net>
carlos at colorado.edu wrote: >> Try Method->"OneStepRowReduction" (without quotes, if in versions < 6) and --------------------------------------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ >> see if that helps. <snip> >> 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? <snip> Have you tried without quotes? Without quotes surrounding the value for the option, the following works fine on my system. In[1]:= $Version mat = {{1, 2, 3}, {1, 3, 4}}; b = {5, 8}; x = LinearSolve[mat, b, Method -> OneStepRowReduction] Out[1]= 5.2 for Microsoft Windows (June 20, 2005) Out[4]= {-1, 3, 0} (More information can be found in Michael Trott's _The Mathematica GuideBook for Programming_, p 826: "Method is an option for the commands LinearSolve, Inverse, RowReduce (to be treated soon), and NullSpace. It defines the internal algorithm to be used in the computation. Default: Automatic. Admissible: DivisionFreeRowReduction or CofactorExpansion or OneStepRowReduction.") HTH -- Jean-Marc
- References:
- Complexity explosion in linear solve
- From: carlos@colorado.edu
- Complexity explosion in linear solve