Sweave boxplots — not the required output

Question

I want to produce a boxplot like this in R:

fishdata <- read.csv("http://dl.dropbox.com/s/4w0utkqdhqribl4/fishdata.csv", header=T)
attach(fishdata)
boxplot(fishdata[,-1], las=3)

which looks like this:

but when I Sweave this, using this coding:

<<echo=F>>=
fishdata <- read.csv("http://dl.dropbox.com/s/4w0utkqdhqribl4/fishdata.csv", header=T)
attach(fishdata)
@ 

\begin{figure}[htbp]
\centering
<<fig=T, echo=F>>=
boxplot(fishdata[,-1], las=3)
@
\rule{35em}{0.5pt}
\caption{Boxplot of the fish catches in Bangladesh from 1950 to 2011.}
\label{histogram}
\end{figure}

produces this still,

Is there a way to get the x-axis titles as above in the coding?

Answer 1

I'll be your Answer the Unanswered officer tonight;

From the comments, it has been verified that in certain cases, it might happen that in such cases deleting the previous plot files is needed.