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I created markov's chain using tikz package. Now I would add to to it caption and label but I got error.How can I add a caption and a label to a tikz object?

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Please provide a MWE. The question as you stated it is way to broad to give a meaningful answer. By the way, did you include your TikZ picture in a figure environment? –  Count Zero Nov 22 '12 at 15:29
    
no I didn't include in a figure environment –  Mazzy Nov 22 '12 at 15:30
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Then I suggest: \begin{figure}\begin{tikzpicture}...\end{tikzpicture}\caption{whatever}\label{f‌​ig:my_fav_tikz}\end{figure}. That should do the trick. :) –  Count Zero Nov 22 '12 at 15:32
    
Ok now it works...I simply add figure environment –  Mazzy Nov 22 '12 at 15:32
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@Mazzy it's not mandatory to use a figure environment; it depends on whether you want the object to float or not. Please see my answer below for more details. –  Gonzalo Medina Nov 22 '12 at 15:41
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2 Answers

up vote 2 down vote accepted

In case you want to use floating environments, you will need to include the TikZ picture in a figure environment:

\begin{figure}
\begin{tikzpicture}
...% TikZ code goes here
\end{tikzpicture}
\caption{whatever}
\label{f‌​ig:my_fav_tikz}
\end{figure}

If you don't want floats, see Gonzalo Medina's answer.

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Well, my answer also includes the float case. –  Gonzalo Medina Nov 22 '12 at 15:45
    
Ok, I didn't see that... I'll delete my answer. –  Count Zero Nov 22 '12 at 15:57
    
can't delete - been accepted... –  Count Zero Nov 23 '12 at 0:12
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If you don't want the object to float, you can use, for example, a minipage and \captionof from the caption package.

If you want the object to be treated as a floating object, you can enclose it within a figure environment.

A simple example illustrating both approaches:

\documentclass{article}
\usepackage{tikz}
\usepackage{caption}

\begin{document}

\begin{figure}
\centering
\begin{tikzpicture}
\draw (0,0) circle (1cm);
\end{tikzpicture}
\caption{A tikz circle}
\label{fig:testb}
\end{figure}

\noindent\begin{minipage}{\textwidth}
\centering
\begin{tikzpicture}
\draw (0,0) circle (1cm);
\end{tikzpicture}
\captionof{figure}{A tikz circle}
\label{fig:testa}
\end{minipage}

\end{document}

enter image description here

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1  
minipage may be better than center, as that prohibits a pagebreak between figure and caption. –  Torbjørn T. Nov 22 '12 at 15:37
    
@TorbjørnT. you're right. Change made. Thanks. –  Gonzalo Medina Nov 22 '12 at 15:39
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