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How to quieten axis() for Sweave: avoid echoing NULL?

3 messages · Andrew Robinson, Ulises M. Alvarez, Peter Dalgaard

Original
Andrew Robinson
# 
Dear R-community,

I'm using Sweave to produce reports.  The reports require the "axis"
command.  When I run axis the program returns NULL as well as creating
the axis.
NULL
So, my Sweave tex files have 

\begin{Schunk}
\begin{Soutput}
NULL
\end{Soutput}
\end{Schunk}

in front of each graphic that requires axis.  I can easily find them
and remove them, but I was wondering: is it something I can avoid?  Or
am I doing something foolish and obvious?

Thanks for any assistance,

Andrew
Ulises M. Alvarez
# 
Hi!

The following works for me:

\begin{figure}
\centering
<<fig1.R,fig=true,echo=false>>=
plot(1:4, rnorm(4), axes=FALSE)
axis(1, 1:4, LETTERS[1:4])
@
\caption{Plot test}
\label{fig:1}
\end{figure}

I'm using R 2.0.1 on an i686 with GNU/Linux Ubuntu 4.10.
Andrew Robinson wrote:
---
Ulises M. Alvarez
<umalvarez at fata.unam.mx>
Peter Dalgaard
# 
Andrew Robinson <andrewr at uidaho.edu> writes:
I think this qualifies as a bug along with similar issues with
title(), text(), and mtext(). They all end with .Internal calls
producing NULL. Once upon a time, they did so invisibly, but somehow
this changed.

The simple workaround is to wrap the call in invisible().