# How to label a code section in Sweave

I'm new to sweave and was wondering what is the appropriate way to label a code section. For example, if I have:

<<echo= true>>=
x<-5
y<-x+5
@


How would I get it to put a either above it or below it, with something like "Code Example 1". I would like something similar to how you can label figures or tables in LaTeX.

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## migrated from stackoverflow.comJun 21 '12 at 16:19

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Welcome to TeX.sx! Your question was migrated here from Stack Overflow. Please register on this site, too, and make sure that both accounts are associated with each other (by using the same OpenID), otherwise you won't be able to comment on or accept answers or edit your question. – Werner Jun 21 '12 at 17:09

In LaTeX captions can be used within float environments like figures or tables. So if your R output is e.g. a figure you can enclose it in a figure environment:

\begin{figure}

<<fig=TRUE, echo=FALSE, eps=TRUE>>=
data(iris)
boxplot(iris[,2]~iris[,5])
@

\caption{A boxplot of the famous Fisher data set.}
\end{figure}


If you want your R-Code as a float environment (with the possibility to use \caption) you will have to define your own float environment. Have a look at LaTeX WikiBook. Something like the following will do it:

\usepackage{float}
\newfloat{rcode}{h!t}{rcode}
\floatname{rcode}{Code Example}


\begin{rcode}
<<echo=true>>=
x<-5
y<-x+5
@
\caption{This code shows something.}
\end{rcode}

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Try something like this:

<<label = MyChunk, echo= true>>=
x<-5
y<-x+5
@

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I did, it has no effect! – user1357015 Jun 21 '12 at 16:01
That wasn't what the OP meant by label the chunk. Yours is the correct answer to a different Q. See the Answer of Stefan Pointner for what appears to have been wanted. – Gavin Simpson Jun 21 '12 at 16:14