Hicham Mouline wrote:
Hello, I am trying to spread the ellipsis over many columns of a matrix... lyx
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

Is there a specific miktex (mpm.exe) package I need to see installed?


You need AMS math loaded. In LyX, go to Document > Settings... > Math Options and check "Use AMS math package".

Also, when you enter the command, be sure to start the braces with \{ rather than just {. If you literally type \hdotsfor{3}, say, what you'll end up with in LaTeX is \hdotsfor\{3\}, escaping the braces, and then LaTeX will complain about a missing or invalid numerical argument. If you type \hdotsfor followed by \{, LyX will convert \{ to a matched pair of braces with an input widget (rectangle) in between them, which is what you want.


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