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方阵

一个广场矩阵仅仅是一个矩阵行数与列数相同。

$［\begin{array}{cccc}\hfill 1& \hfill 0& \hfill 9& \hfill 1\\ \hfill 1& \hfill 3.& \hfill 5& \hfill 2\\ \hfill 0& \hfill 3.& \hfill 6& \hfill -9\\ \hfill -2& \hfill 1& \hfill 4& \hfill 6\end{array}］\to \text{广场}（4\times 4）$

$［\begin{array}{cc}\hfill 1& \hfill 0\\ \hfill 5& \hfill 4\\ \hfill 1& \hfill 4\end{array}］\to \text{不}\text{广场}（3.\times 2）$