latex 矩阵分块（block matrix）

Lesson 12: Making Block Matrices in LATEX

• 按列分块：

  [AAb⋯An−1b]

  $$
  	\left[
  	\begin{array}{c|c|c|c}
  	A & Ab & \cdots & A^{n-1}b
  	\end{array}
  	\right]
  	$$

• 左右分块：

  ⎡⎣⎢⎢⎢⎢⎢a11a21⋮an1a12a22an2⋯⋯⋱⋯a1na2n⋮annb1b2⋮bn⎤⎦⎥⎥⎥⎥⎥

  $$
  	\left[
  	\begin{array}{cccc|c}
  	a_{11}&a_{12}&\cdots&a_{1n}&b_1\\
  	a_{21}&a_{22}&\cdots&a_{2n}&b_2\\
  	\vdots&&\ddots&\vdots&\vdots\\
  	a_{n1}&a_{n2}&\cdots&a_{nn}&b_n\\
  	\end{array}
  	\right]
  	$$

• 四个对角：

  C=[ACBD]

  $$
  	C=
  	\left[
  	\begin{array}{c|c}
  	A& B \\ \hline
  	C& D
  	\end{array}
  	\right]
  	$$