[Tex/LaTex] Error: \caption outside float

captionsfloats

When I add the following table (table1 shown below) I don't get any error, but when adding table2 (shown below) I get the error i)\caption outside float. \caption ii) Undefined control sequence \caption. What is the difference between these two table definitions? These two seems same to me.

latex code for table1 :

\begin{table}[h]
\begin{center}
\begin{tabular}{| p{2.5cm}| p{2.5cm} | p{2.5cm} |}
\hline
\textbf{AAA} & \textbf{BBB} & \textbf{CCC} \\
\hline
DDD   & 111 & 333\\ \hline
EEE   & 222 & 444\\ \hline
\end{tabular}
\end{center}

\caption{Caption1}
\label{table1}

\end{table}

……………………………………………………….

latex code for table2:

begin{table}[h]
\begin{center}
\begin{tabular}{| p{2.5cm}| p{2.5cm} |}
\hline
\textbf{GGG} & \textbf{HHH} \\
\hline
III                    &              113\\ \hline
JJJ                    &              234\\ \hline
KKK                    &              345\\ \hline
\end{tabular}
\end{center}
\caption{Caption2}
\label{table2}
\end{table}

Best Answer

The second table started with

begin{table}[h]

instead of

\begin{table}[h]

meaning it missed a \ and that was what gave the error of a caption outside a float.

Related Solutions

[Tex/LaTex] \caption outside float. Algorithms

Your code uses nothing involving the algorithm2e package and the use of the packages conflict with one another. Instead add the algorithm package to your preamble.

enter image description here

\documentclass{article}
\usepackage{algorithm,algpseudocode}

\begin{document}
\begin{algorithm}
  \caption{Euclid's algorithm}\label{euclid}
  \begin{algorithmic}[1]
    \Procedure{Euclid}{$a,b$}\Comment{The gcd of $a$ and $b$}
      \State $r \gets a \bmod b$
      \While{$r \neq 0$}\Comment{We have the answer if $r$ is $0$}
        \State $a \gets b$
        \State $b \gets r$
        \State $r \gets a \bmod b$
      \EndWhile\label{euclidendwhile}
      \State \textbf{return} $b$\Comment{The gcd is $b$}
    \EndProcedure
  \end{algorithmic}
\end{algorithm}

\end{document}

[Tex/LaTex] Caption inside figure float

I suggest the following:

enter image description here

This is realized using the tcolorbox package:

\documentclass{book}
\usepackage{graphics}
\usepackage{caption}
\DeclareCaptionFormat{overlay}{\gdef\capoverlay{#1#2#3\par}}
\DeclareCaptionStyle{overlay}{format=overlay}

\usepackage[skins]{tcolorbox}

\tcbset{
  caption color/.store in=\captioncolor,
  caption color=white}

\newcommand{\mygraphics}[3][]{%
  \tcbincludegraphics[float*,every float=\centering,blanker,finish={%
    \captionsetup{skip=0pt}%
    \tcbsetmacrotowidthofnode\mywidth{interior}%
    \node[above,fill=\captioncolor,fill opacity=0.5,text opacity=1,
      outer sep=0mm,inner sep=2mm,text width=\mywidth-4mm]
      at (interior.south) {\captionof{figure}{#3}};},
    #1]{#2}%
}

\begin{document}

\mygraphics[caption color=blue!50]{Wing.png}
  {Many of the simple expressions in algebra can be thought of
   in terms of the areas of rectangles.}

\mygraphics[width=7cm]{example-image-a}
  {Many of the simple expressions in algebra can be thought of
   in terms of the areas of rectangles.}

\end{document}

I made a macro \mygraphics which takes two mandatory parameters: the name of the image file and the caption text. Further, a key list can be given as optional parameter. The keys can be any tcolorbox keys. The image is made a float* as was given by the OP.

In this application, the following options are especially interesting:

width to set the width of the image (shown in the example code). The default is the complete text width.
caption color to set the background color of the caption (show in the example code). The default is white.
floatplacement to set the float options like htb etc.

Update:

To scale the figure according to the natural size of included image, the hbox option can be added. But, many pictures may become larger than the textwidth. However, to give options to the underlying \includegraphics macro, you can use graphics options if needed.

The following code has the hbox option set as default. Also, the second example shows how to put a scale=0.5 option to a picture:

\documentclass{book}
\usepackage{graphics}
\usepackage{caption}
\DeclareCaptionFormat{overlay}{\gdef\capoverlay{#1#2#3\par}}
\DeclareCaptionStyle{overlay}{format=overlay}

\usepackage[skins]{tcolorbox}

\tcbset{
  caption color/.store in=\captioncolor,
  caption color=white}

\newcommand{\mygraphics}[3][]{%
  \tcbincludegraphics[float*,every float=\centering,blanker,
    hbox,% <--- the width is determined by the underlying '\includegraphics'
    finish={%
    \captionsetup{skip=0pt}%
    \tcbsetmacrotowidthofnode\mywidth{interior}%
    \node[above,fill=\captioncolor,fill opacity=0.5,text opacity=1,
      outer sep=0mm,inner sep=2mm,text width=\mywidth-4mm]
      at (interior.south) {\captionof{figure}{#3}};},
    #1]{#2}%
}

\begin{document}

\mygraphics[caption color=blue!50]{Wing.png}
  {Many of the simple expressions in algebra can be thought of
   in terms of the areas of rectangles.}

\mygraphics[graphics options={scale=0.5}]{example-image-a}
  {Many of the simple expressions in algebra can be thought of
   in terms of the areas of rectangles.}

\end{document}

Best Answer

Related Solutions

[Tex/LaTex] \caption outside float. Algorithms

[Tex/LaTex] Caption inside figure float

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