我曾经使用knitrinR从.Rnw格式中生成报告。在我的报告中，我经常放置大量的图并使用块选项来操纵它们的大小，例如：
\begin{figure}[h!]
\centering
<<fig.width=6, fig.height=4, out.width='.89\\linewidth'>>=
plot(mtcars)
@
\caption{}
\end{figure}
那是几个月前的事了。然后我转移到另一个环境，重新安装了 R，这些选项似乎不再起作用 - PDF 输出上的绘图大小保持不变！
这是有关任何选项设置的所有代码行。我期待任何建议我做错了什么。
<< >>=
library(knitr)
knitr::opts_chunk$set(echo=F, eval=T, message = F, warning=F, cache = F, fig=TRUE)
@
\begin{figure}[h!]
\centering
<<fig.width=10, fig.height=3, out.width='.89\\linewidth', fig=TRUE, echo=F>>=
plot(mtcars)
@
\caption{mtcars plot}
\end{figure}
当我使用<<fig.width=10, fig.height=3, fig=TRUE, echo=F>>=.
会话信息
> sessionInfo()
R version 3.1.1 (2014-07-10)
Platform: x86_64-pc-linux-gnu (64-bit)
locale:
[1] LC_CTYPE=en_US.UTF-8
[2] LC_NUMERIC=C
[3] LC_TIME=pl_PL.UTF-8
[4] LC_COLLATE=en_US.UTF-8
[5] LC_MONETARY=pl_PL.UTF-8
[6] LC_MESSAGES=en_US.UTF-8
[7] LC_PAPER=pl_PL.UTF-8
[8] LC_NAME=C
[9] LC_ADDRESS=C
[10] LC_TELEPHONE=C
[11] LC_MEASUREMENT=pl_PL.UTF-8
[12] LC_IDENTIFICATION=C
attached base packages:
[1] splines stats4 stats graphics grDevices
[6] utils datasets methods base
other attached packages:
[1] bootstrap_2014.4 dplyr_0.3.0.9000
[3] het.test_0.1 vars_1.5-2
[5] lmtest_0.9-33 urca_1.2-8
[7] strucchange_1.5-0 sandwich_2.3-2
[9] zoo_1.7-11 MASS_7.3-34
[11] VGAM_0.9-6 ggplot2_1.0.0
[13] manipulate_0.98.1078
loaded via a namespace (and not attached):
[1] assertthat_0.1 colorspace_1.2-4 DBI_0.3.1
[4] digest_0.6.4 evaluate_0.5.5 formatR_1.0
[7] grid_3.1.1 gtable_0.1.2 htmltools_0.2.6
[10] knitr_1.7 labeling_0.3 lattice_0.20-29
[13] lazyeval_0.1.9 magrittr_1.0.1 munsell_0.4.2
[16] parallel_3.1.1 plyr_1.8.1 proto_0.3-10
[19] Rcpp_0.11.3 reshape2_1.4 rmarkdown_0.3.9
[22] scales_0.2.4 stringr_0.6.2 tools_3.1.1
[25] yaml_2.1.13
PDF 输出截图（大小不变）
