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I would like to make something that looks like this:

enter image description here

I don't know how to get the brackets inside the matrix to line up in the right spots. I don't need them to be red; I just added that to emphasize what I want.

Here is what I used to make this (sans red brackets):

\begin{bmatrix} I_p \\ & \ddots \\ && I_p \\ & I_p \\ && \ddots \\ &&& I_p \\ &&& \vdots & \ddots \\ &&& \ddots & \vdots \\ &&&& I_p \\ &&&&& \ddots \\ &&&&&& I_p \end{bmatrix}

EDIT: See this followup question for the solution I went with.

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2 Answers 2

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Use blkarray

\documentclass{article} \usepackage{blkarray} \begin{document} \[ \left[ \begin{blockarray}{ccccccc} \begin{block}{[ccc]cccc} I_p \\ & \ddots \\ & & I_p \\ \end{block} \begin{block}{c[ccc]ccc} & I_p \\ & & \ddots \\ & & & I_p \\ \end{block} & & & \vdots & \ddots \\ & & & \ddots & \vdots \\ \begin{block}{cccc[ccc]} & & & & I_p \\ & & & & & \ddots \\ & & & & & & I_p \\ \end{block} \end{blockarray} \right] \] \end{document}

enter image description here

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  • Pretty good! Do you know how to adjust it so that the spacing at the top and the bottom is more even? That is the only thing I don't like about this solution as it is. Commented Feb 22, 2019 at 18:12
  • I fixed it. See this post. Commented Feb 22, 2019 at 21:22
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With {NiceArray} of nicematrix.

\documentclass{article} \usepackage{nicematrix} \begin{document} \[ \begin{NiceArray}{ccccccc}[margin] I_p \\ & \ddots \\ & & I_p \\ & I_p \\ & & \ddots \\ & & & I_p \\ & & & \vdots & \ddots \\ & & & \ddots & \vdots \\ & & & & I_p \\ & & & & & \ddots \\ & & & & & & I_p \\ \CodeAfter \SubMatrix[{1-1}{3-3}] \SubMatrix[{4-2}{6-4}] \SubMatrix[{9-5}{11-7}] \SubMatrix[{1-1}{11-7}][extra-height=1mm,xshift=1mm] \end{NiceArray} \] \end{document}

Output of the above code

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