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There is no way out of pander in for loop in knitr

Using knitr in RStudio, pander does not produce any (or correct) html output when in a for loop. Here is a minimal case like input Rmd file.

--- 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 ```

The result is the same for other (more interesting) "summary" objects, for example. summary of compliance lm. The same behavior was observed for the pander 0.5.2 from CRAN, as well as 0.5.3 downloaded from github.

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
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@daroczig replied in the comments:

  • change the knitr chunk results parameter to asis , either globally knitr::opts_chunk$set(results="asis") , or at the fragment level ```{r,results="asis"}
  • disable panderOption knitr.auto.asis : panderOptions('knitr.auto.asis', FALSE)

Cf. this question

 --- 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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