rChart forceY multiBar “Bar start” not correct in rmarkdown

问题

when I run the r code in the console, I get the output I expected, but when I run it in rmarkdown I get this result:

The complete rmarkdown minimum example looks like this:

---
title: "Untitled"
author: "sda"
output: html_document
---


```{r}
library(dplyr)
library(tidyr)
library(rCharts)
library(data.table)
```

```{r results = 'asis', comment = F, message = F, tidy = F, echo=F, cache=F}

myData <- data.table(XAxis = rep(seq(0,length.out = 3),each = 2),
                     Value = c(0.6,0.8,0.4,0.55,0.87,0.42),
                     Type = c("A", "B", "A", "B", "A", "B"))

  #' Create a multiBarChart using nvd3 of rCharts
  plot <- nPlot(Value ~ XAxis, group = 'Type', 
                            data = myData, type = 'multiBarChart')

  plot$chart(forceY = c(0.5, 1))
 plot$show('iframesrc', cdn = TRUE)


```
Look the bars start too low

So the forceY does not seem to work correctly. Is there an easy workaround for this?

回答1:

The easiest workaround is to save the plot and display it in an iframe. Your example would look as follows:

---
title: "Untitled"
author: "sda"
output: html_document
---


```{r}
library(dplyr)
library(tidyr)
library(rCharts)
library(data.table)
```

```{r results = 'asis', comment = F, message = F, tidy = F, echo=F, cache=F}

myData <- data.table(XAxis = rep(seq(0,length.out = 3),each = 2),
                     Value = c(0.6,0.8,0.4,0.55,0.87,0.42),
                     Type = c("A", "B", "A", "B", "A", "B"))


  plot <- nPlot(Value ~ XAxis, group = 'Type', 
                            data = myData, type = 'multiBarChart')

plot$chart(yDomain = c(0.5, 1))
plot$save("plot.html", standalone = TRUE)


```

<iframe src="plot.html" height="500" width="900" frameBorder="0"></iframe>

Note that I used yDomain instead of forceY. I did this because forceY displayed the graph from y=0.4 in my computer. However, the chart will also be shown correctly using forceY.

You can find the discussion I got the idea for this solution here: https://github.com/ramnathv/rCharts/issues/373

来源：https://stackoverflow.com/questions/29937073/rchart-forcey-multibar-bar-start-not-correct-in-rmarkdown

标签

rcharts