javascript - rCharts 格式化轴标签 : outputFormat

Question

考虑从 rCharts/NVD3 示例页面中提取的图

p6 <- nPlot(uempmed ~ date, data = economics, type = 'lineChart')
p6

我试图让我的 y 轴显示百分比，所以我尝试了以下代码(在 R: interactive plots (tooltips): rCharts dimple plot: formatting axis 之后)但它返回一个空白页

p6 <- nPlot(uempmed ~ date, data = economics, type = 'lineChart')
p6$yAxis(outputFormat = "%")
p6

我做了一些研究并得到了以下结果:

p6 <- nPlot(uempmed ~ date, data = economics, type = 'lineChart')
p6$yAxis(tickFormat = "#! function(d) {return d*100 + '%' } !#")
p6

现在，我知道 0 个 javascript，并希望尽可能多地使用 R，至少在短期内如此。谁能告诉我

1. 为什么第一种方法不起作用，以及
2. 第二种方法是否是最好的方法

Answer 1

由于问题 1 的答案在@jdharrison 的评论中，我想我会用完整的代码示例快速回答问题 2，并在评论中展示实现同一目标的不同方法。

  #turn off rstudio viewer
  #since we will be making lots of charts
  #we'll turn it back on at end
  oldviewer = options("viewer")
  options(viewer=NULL)

  data(economics, package = "ggplot2")

  #if we know we would like percent
  #and R is our friend but javascript is not
  #we could do some transformation in R
  economics$uempmed <- economics$uempmed/100

  p6 <- nPlot(uempmed ~ date, data = economics, type = 'lineChart')
  p6
  #then we could use d3.format just like the dimple example
  #except dimple assumes the d3.format part so we just need "%"
  #see https://github.com/PMSI-AlignAlytics/dimple/wiki/dimple.axis#tickFormat
  #for more on d3.format
  #see https://github.com/mbostock/d3/wiki/Formatting#d3_format
  p6$yAxis( tickFormat = "#!d3.format('%')!#" )
  p6

  #however your method works fine also
  p6$yAxis(tickFormat = "#! function(d) {return d*100 + '%' } !#")
  p6

  #but let's say we did not do the above transform
  #dividing by 100
  #here is how we could do it in javascript
  data(economics, package = "ggplot2")
  p6 <- nPlot(uempmed ~ date, data = economics, type = 'lineChart')
  p6$yAxis(tickFormat = "#! function(d) {
    //will change to .2% to show how to get two decimal
   return d3.format('.2%')(d/100)
  } !#")
  p6

  #turn rstudio viewer back on
  options(viewer = oldviewer)