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Often I've seen the matrix equation Ax = b presented as matrix A augmented with vector b, with the individual elements x_1 ... x_n written sequentially as headers across the columns; is it possible to visually achieve this sort of formatting in TeX or LaTeX?

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  • Short answer: Yes. Commented Nov 28, 2014 at 13:19
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    Check out kbordermatrix - the bordermatrix tag should help. Commented Nov 28, 2014 at 13:27

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One option using blkarray:

enter image description here

The code:

\documentclass{article} \usepackage{blkarray} \usepackage{amsmath} \begin{document} \[ \begin{blockarray}{ccccc} x_{1} & x_{2} & \cdots & x_{n} \\ \begin{block}{[cccc|c]} a_{11} & a_{12} & \cdots & a_{1n} & b_{1} \\ a_{21} & a_{22} & \cdots & a_{2n} & b_{2} \\ \vdots & \vdots & \ddots & \vdots & \vdots \\ a_{m1} & a_{m2} & \cdots & a_{mn} & b_{m} \\ \end{block} \end{blockarray} \] \end{document}
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