在RMarkdown html文档中显示python plotly图形

Question

为什么plotly包的python无法在RMarkdown中显示数字但是matplotlib可以？例如：

 ```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE, message = FALSE, warning = FALSE)
```

```{r}
library(plotly)
subplot(
     plot_ly(mpg, x = ~cty, y = ~hwy, name = 'default'),
     plot_ly(mpg, x = ~cty, y = ~hwy) %>%
         add_markers(alpha = 0.2, name = 'alpha'),
     plot_ly(mpg, x = ~cty, y = ~hwy) %>%
         add_markers(symbols = I(1), name = 'hollow')
 )
```

```{python}
import plotly
import plotly.plotly as py
import plotly.graph_objs as go
import numpy as np

plotly.tools.set_credentials_file(username='xxx', api_key='xxx')

N = 500
trace0 = go.Scatter(x = np.random.randn(N), y = np.random.randn(N) + 2, name = "Above", mode = "markers",
marker = dict(size = 10, color = "rgba(152, 0, 0, .8)", line = dict(width = 2, color = "rgb(0,0,0)")))

trace1 = go.Scatter(x = np.random.randn(N), y = np.random.randn(N) - 2, name = "below", mode = "markers",
marker = dict(size = 10, color = "rgba(255, 182, 193, .9)", line = dict(width = 2, color = "rgb(0,0,0)")))

data = [trace0, trace1]
layout = dict(title = "Styled Scatter", yaxis = dict(zeroline = False), xaxis = dict(zeroline=False))
fig = dict(data = data, layout = layout)
py.iplot(fig, filename = "styled-scatter")
```

R代码可以正常工作，但是python代码无法显示数字，代码有什么问题？

Answer 1

这是我做的：

1. 使用plotly offline：
   • 将import plotly.plotly as py替换为import plotly.offline as py
   • 无需在离线模式下设置用户名和API密钥。
2. 使用py.plot(fig, filename = "styled-scatter.html", auto_open=False)：
   • py.iplot()适用于Jupyter笔记本（它将情节直接嵌入笔记本中）
   • auto_open = False参数是为了避免情节弹出。

3. 使用以下内容将html图嵌入到Rmarkdown中：

   ```{r, echo=FALSE}
   htmltools::includeHTML("styled-scatter.html")
   ```
   

   结果如下：