与Getting ggvis::export_png() working类似，但我试图在Windows上使用RStudio。
我已经安装了node.js并下载了vega并将./bin添加到我的PATH中，但是我收到了错误
mtcars %>% ggvis(~wt, ~mpg) %>% layer_points() %>% export_png
Writing to file plot.png
Error in vega_file(vis, file = file, type = "png") :
Conversion program vg2pngnot found.