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Questions on the manipulation of matrices in Mathematica.
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How to create a block diagonal matrix by repeating a submatrix $n$ times?
If there is a submatrix, let's call $P$:
$P=\begin{pmatrix} 1 & 1 \\ 1 & 1 \end{pmatrix}$
And I want to have $n$, let's say $n=2$, such submatrices placed on the diagonal. The result is expected to …