\floatfoot and equations

Question

I am using \floatfoot to creates notes for a figure in a paper. I would like to include an equation in the notes for this figure. Specifically, I am trying to use the following code:

\floatfoot{Notes: The figure shows coefficients from the following specification:
$$ y = \alpha + \beta X $$
where $y$ is an outcome.}

When I compile this code, the PDF looks correct, although I get several errors in TeXnicCenter. I get errors like,

! Missing $ Inserted

where there are clearly no issues with a missing $ in the above code.

I was wondering if anyone has any recommendations to avoid getting these errors in TeXnicCenter. I've also tried to use the align and equation environments in the \floatfoot command and this generates different (but obviously still problematic) errors.

Answer 1

You can hide the equation in a \parbox or put the whole \floatfoot contents in a minipage as follows:

\documentclass{article}

\usepackage{floatrow}

\begin{document}

\begin{figure}
\floatbox{figure}{\caption{Caption}}
  {\rule{2cm}{2cm}
  \floatfoot{Notes: The figure shows coefficients from the following
  specification:\endgraf
  \parbox{\linewidth}{%
  \begin{displaymath}
    y = \alpha + \beta X 
    \end{displaymath}}\endgraf
  where $y$ is an outcome.}}
\end{figure}

\begin{figure}
\floatbox{figure}{\caption{Caption}}
  {\rule{2cm}{2cm}
  \floatfoot{%
  \begin{minipage}{1.0\linewidth}
    Notes: The figure shows coefficients from the following
    specification:
  \begin{displaymath}
    y = \alpha + \beta X 
  \end{displaymath}
  where $y$ is an outcome.
\end{minipage}%
}}
\end{figure}

\end{document}