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Subject: Re: Large linear system
Date: Sat, 23 Apr 2011 03:57:08 +0000 (UTC)
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"Peter" wrote in message <iot3s5$9k3$1@fred.mathworks.com>...
> Hi, in regards to the above thread, does anyone know the best way to solve a 1e6 x 1e6 sparse non symmetric system?  I am using mldivide (it takes around ~2 min)? Are there any iterative methods that are much faster, and if so, how can I quickly generate the preconditioner (using ilu seems to be slow)?
==================

It depends on a million things, e.g., how sparse the matrix is, how diagonally concentrated it is, etc...

See here for some discussion

http://www.mathworks.com/matlabcentral/newsreader/view_thread/285174