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This is a followup to this question.

MWE (given by Henri Menke in the linked post):

\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}

This produces this: enter image description here

This is almost what I want, except the brackets produced by \left[ and \right are too long on the bottom. I feel like there must be a way to do this exclusively in a blockarray, but the documentation for the package is not extensive enough that it has quickly led me to such a solution.

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2 Answers 2

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blkarray is so weird....

enter image description here

\documentclass{article} \usepackage{blkarray} \addtolength\textwidth{25pt} \begin{document} \[ \left[ \begin{blockarray}{ccccccc} \begin{block}{[ccc]cccc} I_p \\ & \ddots \\ & & I_p \\ \end{block} \begin{block}{c[ccc]ccc} & I_p \\ & & \ddots \\ & & & I_p \\ \end{block} & & & \vdots & \ddots \\ & & & \ddots & \vdots \\ \begin{block}{cccc[ccc]} & & & & I_p \\ & & & & & \ddots \\ & & & & & & I_p \\ \end{block} \end{blockarray} \right] + \left[ \begin{blockarray}{ccccccc} \begin{block}{[ccc]cccc} I_p \\ & \ddots \\ & & I_p \\ \end{block} \begin{block}{c[ccc]ccc} & I_p \\ & & \ddots \\ & & & I_p \\ \end{block} & & & \vdots & \ddots \\ & & & \ddots & \vdots \\ \begin{block}{cccc[ccc]} & & & & I_p \\ & & & & & \ddots \\ & & & & & & I_p \\ \end{block} \BAnoalign{\vspace{-20pt}} \end{blockarray} \right] \] \end{document}
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  • You should contact the author of blkarray about this. ;) Commented Feb 22, 2019 at 23:19
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With {NiceArray} of nicematrix.

\documentclass{article} \usepackage{nicematrix} \begin{document} Without modification of \verb|\delimiterfactor|. % \[ \left[\begin{NiceArray}{ccccccc}[margin] I_p \\ & \ddots \\ & & I_p \\ & I_p \\ & & \ddots \\ & & & I_p \\ & & & \vdots & \ddots \\ & & & \ddots & \vdots \\ & & & & I_p \\ & & & & & \ddots \\ & & & & & & I_p \\ \CodeAfter \SubMatrix[{1-1}{3-3}] \SubMatrix[{4-2}{6-4}] \SubMatrix[{9-5}{11-7}] \end{NiceArray}\right]\] % With \verb|\delimiterfactor=1050| and \verb|\delimiterfactor=901| back in the \verb|\CodeAfter|. % \[\delimiterfactor=1050 \left[\begin{NiceArray}{ccccccc}[margin] I_p \\ & \ddots \\ & & I_p \\ & I_p \\ & & \ddots \\ & & & I_p \\ & & & \vdots & \ddots \\ & & & \ddots & \vdots \\ & & & & I_p \\ & & & & & \ddots \\ & & & & & & I_p \\ \CodeAfter \delimiterfactor=901 % default value \SubMatrix[{1-1}{3-3}] \SubMatrix[{4-2}{6-4}] \SubMatrix[{9-5}{11-7}] \end{NiceArray}\right]\] \end{document}

You need several compilations (because nicematrix uses PGF/Tikz nodes under the hood).

Output of the above code

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