在knitr中,for循环中的pander没有输出

Question

在RStudio中使用knitr,在for循环中,pander不会产生任何(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拟合的摘要.对于来自CRAN的pander 0.5.2观察到相同的行为,并且还从github加载0.5.3.

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

Answer 1

@daroczig在评论中回答:

1. 改变knitr块选项results来asis,无论是在全球范围knitr::opts_chunk$set(results="asis")还是在块级别```{r,results="asis"}
2. 禁用panderOption knitr.auto.asis:panderOptions('knitr.auto.asis', FALSE)

参看 这个问题

---
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))

```