Something I was very happy discovering, as I was already mentally prepared to install the 'pmat' package and engage in ERT :-/
In the matrix set-up dialogue on the math panel, you can add pipe characters to the "ccccc" alignment string, and they will come out as vertical lines in the displayed AND printed matrix... cool. Thus encouraged, I added \hline to the start of the first cell on a line, and true enough a horizontal line appeared in the printout. And after saving and reloading also in the display. I haven't looked very hard, but couldn't find reference to this in the documentation, or on the Web by googling. This is the kind of thing that is not very discoverable for someone not already proficient in LaTeX math. It should at least be in the docs, but better even, in the UI. And there are already menu shortcuts for aligning and even swapping matrix rows; how hard would it be to add one for a horizontal line? - Martin
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