在 for 循环中绘制图表 [英] Plotly charts in a for loop

问题描述

我正在使用 plotly 转换 ggplot2 图表并将它们放入 knitr html 输出中.这是报告的工作副本.http://rpubs.com/kausti/NSEFO-23-Mar-2016第一个图表是情节图表，以下不是.我希望它们是图表，但我被卡住了.

I am converting ggplot2 charts using plotly and putting them in a knitr html output. Here is a working copy of the report. http://rpubs.com/kausti/NSEFO-23-Mar-2016 The first chart is plotly chart and the following ones are not. I would like them to be plotly charts but I am stuck.

在下面的代码中，plotChart 函数返回一个 ggplot2 绘图.此代码有效！

In the code below, plotChart function returns a ggplot2 plot. This code works!

for (tick in tradeOps$ticker)
{
  tmpDF = filter(tradeOps, ticker == tick)
  p = plotChart(tick = tick,Entry = tmpDF$Entry, Target =     tmpDF$Target, SL= tmpDF$SL, TradeType = tmpDF$TradeType, data = wd)
  p = p + annotate("text", x = as.Date(tmpDF$Date)+30, y =   tmpDF$Entry, label = tmpDF$Entry, colour = "blue")
  p = p + annotate("text", x = as.Date(tmpDF$Date)+30, y = tmpDF$Target, label = tmpDF$Target)
  p = p + annotate("text", x = as.Date(tmpDF$Date)+30, y = tmpDF$SL, label = tmpDF$SL)

  print(p)

}

现在，如果我将最后一个打印语句更改为 print(ggplotly(p))，它就不会在 html 中打印图表.该代码在 knitr 之外完美运行.

Now if I change the last print statement to print(ggplotly(p)) it just won't print the charts in html. The code works outside knitr perfectly.

此外，print(ggplotly(p)) 在循环外也能完美运行.我错过了什么吗?

Also, print(ggplotly(p)) works perfectly outside loops. Am I missing something?

包括以下可重现的示例.以下是我的 rmd 文件.

Including a reproducible example below. Following is my rmd file.

---
title: "tmp"
output: html_document
---

```{r, echo=FALSE, message=FALSE, fig.width=8, fig.height=6}
library(ggplot2)
library(plotly)
library(dplyr)
s = NULL
a = data.frame(id = 1:15,x = 2:16, y = 15:1, z = c(rep("a",5),rep("b",5),rep("c",5)))
for(i in unique(a$z)){
  s = a[a$z == i,]
  print(ggplot(s,aes(x = x, y = y)) + geom_point())
}

```

这与显示三个图表的输出 html 完美配合.现在，只需将最后一个打印语句更改为print(ggplotly(ggplot(s,aes(x = x, y = y)) + geom_point())) 生成一个没有任何错误的空白 html.

This works perfectly with the output html showing three graphs. Now, just changing the last print statement to print(ggplotly(ggplot(s,aes(x = x, y = y)) + geom_point())) produces a blank html without any errors.

在终端中运行相同的代码效果很好

Running the same code in terminal works perfectly though

library(ggplot2)
library(plotly)
library(dplyr)
s = NULL
a = data.frame(id = 1:15,x = 2:16, y = 15:1, z = c(rep("a",5),rep("b",5),rep("c",5)))
for(i in unique(a$z)){
  s = a[a$z == i,]
  print(ggplotly(ggplot(s,aes(x = x, y = y)) + geom_point()))
}

感谢任何帮助.

谢谢，考斯图布

推荐答案

原来问题在这里解决了https://github.com/ropensci/plotly/issues/273

knitr 在循环中打印绘图图表时存在已知问题.从这里引用最终答案cpsievert

knitr has known issues printing plotly charts in a loop. Quoting the final answer cpsievert from here

```{r}
l <- htmltools::tagList()
for (i in 1:3) {
  l[[i]] <- as.widget(plot_ly(x = rnorm(10)))
}
l
```

这解决了我的问题.尽管在找到此解决方案之前，我最终将所有内容从 ggplot2 移植到 plotly R api.

This solved my problem. Though I ended up porting everything from ggplot2 to plotly R api before I found this solution.

MLavoie，感谢您的帮助.我生成了一个虚拟数据集，只是为了创建一个可重现的示例.尽管您的解决方案可能解决了虚拟示例，但在当前问题中与我无关.我认为这里提供的解决方案应该是通用的.

MLavoie, thanks for your help. I had generated a dummy dataset just to create a reproducible example. Though your solution probably solves the dummy example, it is not all that relevant to me in the current problem. I think the solution provided here should be generic.

谢谢，考斯图布

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