For loops over a digraph in R does not work

Question

There is strange behavior in dygraph .

When using the for loop for dygraph I do not get the result.

 library(dygraphs) lungDeaths <- cbind(mdeaths, fdeaths) for(i in 1:2){ dygraph(lungDeaths[, i]) } 

On the other hand, when I use lapply , I get the expected result

 lapply(1:2, function(i) dygraph(lungDeaths[, i])) 

I really want to use the for loop in R Markdown in my own dataset and lapply over different columns, but even when I use the lapply , it does not display dygraphs

Markdown Code

 --- title: "Untitled" author: "dimitris_ps" date: "28 May 2015" output: html_document --- ```{r} library(dygraphs) lungDeaths <- cbind(mdeaths, fdeaths) lapply(1:2, function(i) dygraph(lungDeaths[, i])) ``` 

While when I run it in a column, it works

 --- title: "Untitled" author: "dimitris_ps" date: "28 May 2015" output: html_document --- ```{r echo=FALSE} library(dygraphs) lungDeaths <- cbind(mdeaths, fdeaths) ``` ```{r} dygraph(lungDeaths[, 1]) dygraph(lungDeaths[, 2]) ``` 

Any help would be greatly appreciated.

Session Information

 R version 3.2.0 (2015-04-16) Platform: x86_64-w64-mingw32/x64 (64-bit) Running under: Windows 7 x64 (build 7601) Service Pack 1 locale: [1] LC_COLLATE=English_United Kingdom.1252 LC_CTYPE=English_United Kingdom.1252 [3] LC_MONETARY=English_United Kingdom.1252 LC_NUMERIC=C [5] LC_TIME=English_United Kingdom.1252 attached base packages: [1] stats graphics grDevices utils datasets methods base other attached packages: [1] dygraphs_0.4.3 devtools_1.7.0 loaded via a namespace (and not attached): [1] htmltools_0.2.6 tools_3.2.0 yaml_2.1.13 rmarkdown_0.6.1 digest_0.6.8 

Answer 1

Just complete the listing from lapply() to htmltools::tagList() , for example.

 ```{r} library(dygraphs) lungDeaths <- cbind(mdeaths, fdeaths) res <- lapply(1:2, function(i) dygraph(lungDeaths[, i])) htmltools::tagList(res) ```