LyX ⇒ inserting cases environment

[libuz]

I am beginner of Latex and Lyx. I tried to insert case environment from the menu, like ={a b
but I am getting an error

Code: Select all

! Misplaced alignment tab character &.
 a &
          b\end{cases}$
I can't figure out why you would want to use a tab mark
here. If you just want an ampersand, the remedy is
simple: Just type `I\&' now. But if some right brace
up above has ended a previous alignment prematurely,
you're probably due for more error messages, and you
might try typing `S' now just to see what is salvageable.

How can I fix this?

[scottkosty]

I am beginner of Latex and Lyx. I tried to insert case environment from the menu, like ={a b
but I am getting an error
! Misplaced alignment tab character &.
a &
b\end{cases}$
I can't figure out why you would want to use a tab mark
here. If you just want an ampersand, the remedy is
simple: Just type `I\&' now. But if some right brace
up above has ended a previous alignment prematurely,
you're probably due for more error messages, and you
might try typing `S' now just to see what is salvageable.

How can I fix this?

Hi libuz,

Welcome to the forum!

To insert 'cases' in LyX, go to Insert > Math > Cases Environment. If you get an error with this, it's probably because you need to change
Document > Settings > Math Options
to load the correct packages.

Does that work? If not, please post a minimum working example .lyx file.

Scott

[libuz]

Hi Scott,
Thank you very much. It worked after I selected:
Use AMS math package automatically
in the Math Option.

[scottkosty]

Hi Scott,
Thank you very much. It worked after I selected:
Use AMS math package automatically
in the Math Option.

Great! Thanks for posting back that it worked.

Scott