$M=[0_{n\times n_1},0_{n\times n_2},I_{n_3}]\times[P_1,R_1,Q_1]^{-1}$ where $P_1,R_1,Q_1$ is of size $n\times n_1,n\times n_2,n\times n_3$ and $n_1+n_2+n_3=n$ my question is is it possible to simplyfy the product?
Is it possible to multiply blockwise
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matrices
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0You can multiply blockwise and you can take blockwise inverses if the diagonal blocks are square, but I don't think you can take blockwise inverses if all the blocks are rectangular. – 2017-02-05
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0I was also thinking the same thank you – 2017-02-05