I've been trying to add a new command to LyX to easen my way through physics, when mostly 3×3 determinants are used.
I clicked Document
-> Settings
-> Preamble
and wrote the following:
% det 3x3
\newcommand{\ninedet}{$\begin{vmatrix}\\
\\
\\
\end{vmatrix}$}
Now, there are a few problems:
- I understand that this code is supposed to make a 3×1 det, not 3×3.
- It doesn't seem to work either way.
Thoughts? Any help would be deeply appreciated. :)
Best Answer
I do not see the need of defining something new. With following approach, LyX will make use of the
vmatrix
environment automatically.Use "Insert > Math > Matrix..." or alternatively, in math mode the toolbar to create an empty 3x3 matrix possible with some decoration like "
|...|
". Then you can copy and paste this matrix (either empty or already filled) to other locations in the document.