Reproducing a Choropleth Map by using plotly package in R

问题

library(plotly)
df <- read.csv("https://raw.githubusercontent.com/plotly/datasets/master/2011_us_ag_exports.csv")
df$hover <- with(df, paste(state, '<br>', "Beef", beef, "Dairy", dairy, "<br>",
                           "Fruits", total.fruits, "Veggies", total.veggies,
                           "<br>", "Wheat", wheat, "Corn", corn))
# give state boundaries a white border
l <- list(color = toRGB("white"), width = 2)
# specify some map projection/options
g <- list(
  scope = 'usa',
  projection = list(type = 'albers usa'),
  showlakes = TRUE,
  lakecolor = toRGB('white')
)

p <- plot_geo(df, locationmode = 'USA-states') %>%
  add_trace(
    z = ~total.exports, text = ~hover, locations = ~code,
    color = ~total.exports, colors = 'Purples'
  ) %>%
  colorbar(title = "Millions USD") %>%
  layout(
    title = '2011 US Agriculture Exports by State<br>(Hover for breakdown)',
    geo = g
  )

p

The above code is from plotly website and the plot produced should be as follows:

However, the plot I generated by using the code is as follows:

What happens? Do I need to install some other packages to reproduce the correct plot?

回答1:

I got this too. If you open the javascript console you can see an error:

   Failed to load resource: Unable to init SSL Context:

while it is trying to open this file:

 "https://cdn.plot.ly/world_110m.json"

Here is a screen shot:

Cause:

I believe this is because the non-professional Version of R-Studio does not support https by design, so there is probably no work around except wrapping it as markdown and viewing it in a browser as I describe below.

Workaround:

If you package it in R-markdown (put your code between the following lines):

```{r} 

 (your code here)

```

and then save it as an .Rmd file) and knit it. Then it will still not work in the R-Studio preview-browser, and but it does if you use the "Open in Browser" function and open it in Chrome (for example).

Or buy the professional version :).

来源：https://stackoverflow.com/questions/43458527/reproducing-a-choropleth-map-by-using-plotly-package-in-r

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rstudio

plotly