r - knitr makes multiple figures instead of adding just lines() to axes -

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i have simple rnw file:

\documentclass[10pt,a4paper]{article} \usepackage[latin1]{inputenc} \begin{document} <<mychunk, echo=false, cache=false, fig.keep='all'>>= plot(rnorm(100),rnorm(100)) lines(c(-1,1),c(-1,1)) @ \end{document}

the r chunk

plot(rnorm(100),rnorm(100)) lines(c(-1,1),c(-1,1))

should give 1 figure. instead, output tex 

\includegraphics[width=\maxwidth]{figure/mychunk1} \includegraphics[width=\maxwidth]{figure/mychunk2}

with 2 separate figures

enter image description here , enter image description here

this doesn't happen in instances of plot , lines, depending on arguments, code i've given reproduces problem. should have second figure.

you've set fig.keep="all", , getting expected setting! described in the online documentation, option "keep[s] plots (low-level plot changes may produce new plots)".

try instead fig.keep="high" (the default, can leaving out fig.keep argument) or fig.keep="last", depending on want.


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