grid_plots not showing in a R markdown document

[apratap]

inside a Rmd document I dont see the output of the following code in knitted html document

idx <- split(1:150, iris$Species)
figs <- lapply(idx, function(x) {
  figure(width = 300, height = 300) %>%
    ly_points(Sepal.Length, Sepal.Width, data = iris[x,],
      hover = list(Sepal.Length, Sepal.Width))
})

grid_plot(figs)

[hafen]

It works for me. Can you provide more information? My environment:

> sessionInfo()
R version 3.2.4 (2016-03-10)
Platform: x86_64-apple-darwin13.4.0 (64-bit)
Running under: OS X 10.11.4 (El Capitan)

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] rbokeh_0.4.2

loaded via a namespace (and not attached):
 [1] Rcpp_0.12.4       knitr_1.12.3      magrittr_1.5      maps_3.1.0       
 [5] munsell_0.4.3     lattice_0.20-33   colorspace_1.2-6  R6_2.1.2         
 [9] stringr_1.0.0     httr_1.1.0        plyr_1.8.3        dplyr_0.4.3      
[13] tools_3.2.4       parallel_3.2.4    grid_3.2.4        gtable_0.2.0     
[17] DBI_0.3.1         gistr_0.3.6       htmltools_0.3.5   yaml_2.1.13      
[21] lazyeval_0.1.10   digest_0.6.9      assertthat_0.1    pryr_0.1.2       
[25] ggplot2_2.1.0     codetools_0.2-14  htmlwidgets_0.6   rsconnect_0.4.2.1
[29] rmarkdown_0.9.5   stringi_1.0-1     scales_0.4.0      jsonlite_0.9.19  
[33] hexbin_1.27.1