LyX ⇒ problem with formula in rotatebox

[Stef Pillaert]

Hello,
in LyX, I have a very large formula, and I'm trying to rotate is using "rotatebox". I get an error/warning as in "warning.jpg", but strangely enough, the pdf-output looks rather OK.
Also the Lyx-file in attachment, the rotatebox is near to the end of the document.
Any help appreciated a lot,
Stef

[Stefan Kottwitz]

Hi Stef!

There is an error in the code, and LyX seems to hide it. Perhaps post also the pdfLaTeX export here, as attachment, as I don't have LyX here, then I could easily see the cause.

Stefan

[scottkosty]

I'd be happy to take a look but your document is not a minimal example. Can you please post a minimal example .lyx file? For more information, please read https://wiki.lyx.org/FAQ/MinimalExample

[Stef Pillaert]

OK, I tried to make a minimal example.
I also tried with a scalebox (included in the example also), resulting into similar behaviour: I get similar errormessages, while the pdf-output looks rather OK to me.
I also exported from LyX a LaTeX (pdflatex) and a pdf (pdflatex) file, I hope these are the exprts that you wanted to see?
Please let me know if my info should be in another format, I really use LyX without knowing very much of LaTeX (but you allready guessed that ...)

Thanks,
Stef

[Stefan Kottwitz]

The equation environment needs a box with a width to center within. The rotating box or scaling box doesn't specify a width.

A solution would be, to rotate a box that has a width, such as a parbox or minipage. That can contain the equation. Such as, said in LaTeX code:

Code: Select all

\rotatebox{90}{\parbox{\textheight}{
\begin{equation}
  ...
\end{equation}
}}

That can be adapted to LyX.

Stefan

[Stef Pillaert]

Many thanks! And indeed, I can do this easily in LyX: just putting the equation in a box, and putting this box into the rotatebox does the trick.
(Should this be considered as a bug in LyX?)
Stef

[Stefan Kottwitz]

That's not a bug. The same happens in LaTeX. It's just a limitation: \rotatebox uses the width of the inner object (for placement), equation uses the width of the outer object (to center within). One of them needs to have a width, so putting a box of a defined width between them fixes it.

Stefan

[Stef Pillaert]

OK. Just a small one still: the scalebox suits me best for what I want, but now the number of the equation is printed below the equation, even if there is enough space to print it on the right side of it (see new attrachments). Even if I scale a lot (factor 0.5), this still happens...
Is there an easy way to avoid this?
Stef

[Stefan Kottwitz]

Interesting! And maybe unusual.

The equation number is place below if the equation is very wide. That happens inside the box, the resizing comes later, outside, via \scalebox. So, a way to get working is

• making the minipage big enough (the LyX box),
• compensate by scaling a bit smaller then.

Code: Select all

\scalebox{0.66}{%
\noindent\begin{minipage}[t]{1.4\textwidth}%
\begin{equation}

It's not the common way to use maths in books, so also the fix is a bit unusual.

Stefan

[Stef Pillaert]

Many thanks for your time, kindness and patience! This works perfectly!
Stef