I'm doing a presentation for my school and have an issue. Here is my code:
\documentclass[10pt]{beamer} \usetheme{Warsaw} \usepackage[utf8]{inputenc} \usepackage[T1]{fontenc} \usepackage[french]{babel} \usepackage{graphicx} \usepackage{lmodern} \usepackage{siunitx} \usepackage{amsmath} \usepackage{amssymb} \usepackage{mathrsfs} \begin{document} \begin{frame} \frametitle{Centre of mass} \begin{columns}[c] \begin{column}{.5\textwidth} \includegraphics[width=\textwidth]{Images/05-12.jpg} \end{column} \begin{column}{.5\textwidth} \begin{align*} \vec{r}_{CM} &= \frac{m_1 \vec{r}_1 + m_2 \vec{r}_2 + \dots + m_n \vec{r}_n}{m_1 + m_2 + \dots + m_n} \\ CM_x &= \frac{m_1 x_1 + m_2 x_2 + \dots + m_n x_n}{m_1 + m_2 + \dots + m_n} \end{align*} \end{column} \end{columns} \end{frame} \end{document}
Pdflatex returns me those error messages:
! Paragraph ended before \align* was complete.
<to be read again>
\par
l.167 \end{frame}
I suspect you've forgotten a `}', causing me to apply this
control sequence to too much text. How can we recover?
My plan is to forget the whole thing and hope for the best.
! Missing $ inserted.
<inserted text>
$
l.167 \end{frame}
I've inserted a begin-math/end-math symbol since I think
you left one out. Proceed, with fingers crossed.
! Missing \endgroup inserted.
<inserted text>
\endgroup
l.167 \end{frame}
I've inserted something that you may have forgotten.
(See the <inserted text> above.)
With luck, this will get me unwedged. But if you
really didn't forget anything, try typing `2' now; then
my insertion and my current dilemma will both disappear.
! Display math should end with $$.
<to be read again>
\par
l.167 \end{frame}
The `$' that I just saw supposedly matches a previous `$$'.
So I shall assume that you typed `$$' both times.
! Missing $ inserted.
<inserted text>
$
l.167 \end{frame}
I've inserted a begin-math/end-math symbol since I think
you left one out. Proceed, with fingers crossed.
! Misplaced alignment tab character &.
\beamer@doifinframe ...\dots + m_n} \\ \par CM_x &
= \frac {m_1 x_1 + m_2 x_2...
l.167 \end{frame}
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.
! Misplaced \cr.
\math@cr@@@ ->\cr
l.167 \end{frame}
I can't figure out why you would want to use a tab mark
or \cr or \span just now. If something like a 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.
! Misplaced \noalign.
\math@cr@@ ... \iffalse }\fi \math@cr@@@ \noalign
{\vskip #1\relax }
l.167 \end{frame}
I expect to see \noalign only after the \cr of
an alignment. Proceed, and I'll ignore this case.
! Missing $ inserted.
<inserted text>
$
l.167 \end{frame}
I've inserted a begin-math/end-math symbol since I think
you left one out. Proceed, with fingers crossed.
! Missing } inserted.
<inserted text>
}
l.167 \end{frame}
I've inserted something that you may have forgotten.
(See the <inserted text> above.)
With luck, this will get me unwedged. But if you
really didn't forget anything, try typing `2' now; then
my insertion and my current dilemma will both disappear.
! Extra }, or forgotten \endgroup.
\math@cr@@ ...th@cr@@@ \noalign {\vskip #1\relax }
l.167 \end{frame}
I've deleted a group-closing symbol because it seems to be
spurious, as in `$x}$'. But perhaps the } is legitimate and
you forgot something else, as in `\hbox{$x}'. In such cases
the way to recover is to insert both the forgotten and the
deleted material, e.g., by typing `I$}'.
! Misplaced \noalign.
\black@ #1->\noalign
{\ifdim #1>\displaywidth \dimen@ \prevdepth \nointerlin...
l.167 \end{frame}
I expect to see \noalign only after the \cr of
an alignment. Proceed, and I'll ignore this case.
! Extra }, or forgotten \endgroup.
\endalign ->\math@cr \black@ \totwidth@ \egroup
\ifingather@ \restorealignst...
l.167 \end{frame}
I've deleted a group-closing symbol because it seems to be
spurious, as in `$x}$'. But perhaps the } is legitimate and
you forgot something else, as in `\hbox{$x}'. In such cases
the way to recover is to insert both the forgotten and the
deleted material, e.g., by typing `I$}'.
! Missing $ inserted.
<inserted text>
$
l.167 \end{frame}
I've inserted something that you may have forgotten.
(See the <inserted text> above.)
With luck, this will get me unwedged. But if you
really didn't forget anything, try typing `2' now; then
my insertion and my current dilemma will both disappear.
! Display math should end with $$.
<to be read again>
\endgroup
l.167 \end{frame}
The `$' that I just saw supposedly matches a previous `$$'.
So I shall assume that you typed `$$' both times.
Thank you very much for your help!
If you need anything else, don't hesitate to ask.
P.S.: I'm not a native so please forgive my mistakes.