On Thu, Aug 9, 2012 at 9:26 AM, Jinquan Zhong <jzhong at scsolutions.com>wrote:
> ? A?x=b, where A?=[A^-1 U B]= ****
>
> What does the notation above mean? ****
>
> **? **That means A? consists A^-1 and B. A? is a sparse matrix at the
> order of 2 million. B = sparse matrix at the order of 2 million to be
> mixed and mingled with A^-1.
>
>
"mingled" is not a very useful term. How about using an actual equation so
we can have some clue what you mean.
> ****
>
> What are the dimensions and sparsity of each piece. ****
>
> **? **The dimension of A^-1 is about 225,000. B is about 2 millions. ***
> *
>
> ** **
>
> If you have an "inverse" floating around, what sort of operator is it the
> inverse of.****
>
> **? **A is a double complex matrix we have generated from a practical
> application using FEM.
>
Then there is no way A^{-1} should be stored as a dense matrix.
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