s**p
发帖数: 207 | 1 Hi
我同时也发在google group上了，所以就不想翻译了，大家帮忙看看吧
I have a full rank matrix A (n-by-n), and a mapping matrix B (B is not
square, but m-by-n with m
Then I have a matrix C = B A B.', C (m-by-m) is also full rank.
I have inv(A) and I want to know inv(C). Any efficient way of doing
it?
Rgds
I can make B square and full rank by fill in some independant rows, so
I get another matrix D, where C is part of D. D=[ C X; X X], X is some
non-zeros block. Then I might be able to find inv(C), am I on the
right tra |
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