在 RStudio 中使用 knit，pander 在 for 循环中不会生成任何（或正确的）html 输出。这是一个最小的情况，作为 Rmd 输入文件。
---
title: "Untitled"
output: html_document
---
Testing why pander doesn't work in for loop
```{r global_options, include=FALSE}
knitr::opts_chunk$set(fig.width=7, fig.height=5, echo=FALSE, warning=FALSE,
message=FALSE)
```
```{r}
library(pander)
r <- 1:10
print("pander at top level")
pander(summary(r)) # works
print("pander in for loop")
for (i in 1:2) pander(summary(r)) #does not work (nothing in output)
for (i in 1:2) print(pander(summary(r))) #does not work (code in output)
for (i in 1:2) print(summary(r)) # works
```
对于其他（更有趣的）“摘要”对象，结果是相同的，例如LM 拟合的总结。来自 CRAN 的 pander 0.5.2 以及从 github 加载的 0.5.3 也观察到了相同的行为。
RStudio v 0.99.467。
> sessionInfo()
R version 3.2.0 (2015-04-16)
Platform: x86_64-apple-darwin13.4.0 (64-bit)
Running under: OS X 10.10.4 (Yosemite)
locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] pander_0.5.3
loaded via a namespace (and not attached):
[1] minqa_1.2.4 MASS_7.3-40 Matrix_1.2-0 htmltools_0.2.6 tools_3.2.0
[6] yaml_2.1.13 Rcpp_0.11.6 rmarkdown_0.7 splines_3.2.0 nlme_3.1-120
[11] grid_3.2.0 digest_0.6.8 nloptr_1.0.4 lme4_1.1-7 lattice_0.20-31
@daroczig 在评论中回答：
- 更改knitr块选项
results to asis，无论是在全球层面knitr::opts_chunk$set(results="asis")或者在块级别```{r,results="asis"}
- disable
panderOption knitr.auto.asis : panderOptions('knitr.auto.asis', FALSE)
Cf.
这个问题 https://github.com/Rapporter/pander/issues/142#issuecomment-66619769
---
title: "Untitled"
output: html_document
---
Testing **when** pander doesn't work in for loop
```{r global_options, include=FALSE}
knitr::opts_chunk$set(fig.width=7, fig.height=5, echo=TRUE, warning=FALSE,
message=FALSE)
```
```{r,results="asis"}
library(pander)
panderOptions('knitr.auto.asis', FALSE)
r <- 1:10
for (i in 1:2) pander(summary(r))
```
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