LaTeX forum ⇒ Presentations and PostersProblem with mathematicals environment and Beamer Topic is solved

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Mojert
Posts: 2
Joined: Mon Dec 05, 2016 7:27 pm

Problem with mathematicals environment and Beamer

Postby Mojert » Mon Dec 05, 2016 7:41 pm

Hello everyone !

I'm doing a presentation for my school and have an issue. Here is my code:
  1. \documentclass[10pt]{beamer}
  2. \usetheme{Warsaw}
  3.  
  4. \usepackage[utf8]{inputenc}
  5. \usepackage[T1]{fontenc}
  6. \usepackage[french]{babel}
  7. \usepackage{graphicx}
  8. \usepackage{lmodern}
  9. \usepackage{siunitx}
  10. \usepackage{amsmath}
  11. \usepackage{amssymb}
  12. \usepackage{mathrsfs}
  13.  
  14. \begin{document}
  15. \begin{frame}
  16. \frametitle{Centre of mass}
  17. \begin{columns}[c]
  18. \begin{column}{.5\textwidth}
  19. \includegraphics[width=\textwidth]{Images/05-12.jpg}
  20. \end{column}
  21. \begin{column}{.5\textwidth}
  22. \begin{align*}
  23. \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} \\
  24.  
  25. CM_x &= \frac{m_1 x_1 + m_2 x_2 + \dots + m_n x_n}{m_1 + m_2 + \dots + m_n}
  26. \end{align*}
  27. \end{column}
  28. \end{columns}
  29. \end{frame}
  30. \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.

User avatar
Johannes_B
Site Moderator
Posts: 3602
Joined: Thu Nov 01, 2012 4:08 pm

Postby Johannes_B » Mon Dec 05, 2016 8:51 pm

Empty lines are not allowed in an align environment. Put a percent sign at the beggining of those lines.
The smart way: Calm down and take a deep breath, read posts and provided links attentively, try to understand and ask if necessary.

Mojert
Posts: 2
Joined: Mon Dec 05, 2016 7:27 pm

Postby Mojert » Mon Dec 05, 2016 9:39 pm

Thank you very much for your help, I highly appreciate it !


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