y**t
发帖数: 50 | 1 if a,b,c are very close,you can use
a^{-1}(1-ba^{-1}-ca^{-1}) to approximate
in fact,using algorithms from numerical ricipe,
it is not terrible to do inverse directly
unless your dimension is millions | a****o
发帖数: 42 | 2 For such large scale problem, before you do anything
concrete,
it might be a good thing to first try to find some way of
not
inverse the matrix.
Some thing you might consider:
1. If the matrix sparse? I guess it should be.
2. Are you really want to have a 1/A, or you just want an
answer to AX=b?
3. Except for symmetry, are their other characteristic you
can
exploit?
If all the answer is NO, perhaps what yhht said is right: do
the
inverse directly using some method, the reason is that for
such
la |
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