5

I'd like to create a matrix like this:

\documentclass{article}
\usepackage{amsmath}
\begin{document}
$$ \begin{bmatrix}
    a & b' \\
    b & D
\end{bmatrix} $$
\end{document}

but I'd like to indicate that the size of vector b and put it like on two fields, horizontally or vertically. The same with matrix D which I'd like to put like a 2×2 matrix with a name in the center.

Goal

  • 2
    Welcome to TeX.SX! Could you please complete your code in order to make a minimal working example (MWE) that inlcudes the relevant packages as well as the documentclass? Could you please also include a sketch of the output you'd like to achieve? – leandriis Mar 2 at 14:26
  • 1
    Now it is good that you already provided an MWE, so I upvoted your question, but I can't still get it. Please add a sketch showing what you want. – user156344 Mar 2 at 14:36
  • Thank you for helping me with my first post. I have some experience at other community where it would automatically compile. Polish one. – lelel Mar 2 at 14:40
  • You remember that $$...$$ is TeX primitive syntax. – Sebastiano Mar 2 at 16:56
  • @Sebastiano what does it mean? – lelel Mar 2 at 17:24
6

I pretend that the second item in the first row is as wide as two normal columns. Similarly, the second item in the second row is as tall as two normal rows.

\documentclass{article}
\usepackage{amsmath,mathtools}

\begin{document}

\[
\sbox0{$\begin{matrix} D & D\end{matrix}$}
\left[\begin{array}{c|c}
a & \mathmakebox[\wd0]{b'} \\
\hline
b & \vphantom{\begin{matrix} D \\ D \end{matrix}} D
\end{array}\right]
\]

\end{document}

enter image description here

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