r 结合ggRadar和facet_wrap

下面的代码说明了我的问题。我想在 ggiraphExtra 中使用 ggRadar 函数，因为它允许与图形交互。我想要每种营养素有一个单独的蜘蛛图，并且我希望每个蜘蛛图每年都有一组单独的连接点。据我现在了解，在 ggRadar 中，代码mapping = aes(colour = year)是为每年提供单独的点的内容。在facet_wrap中的代码facet_wrap(~ nutrient)决定了有多少个单独的蜘蛛图。

require(ggiraphExtra)
require(ggplot2)
spiderData <- data.frame(year = c("2010", "2010", "2010", "2010", "2030", "2030", "2030", "2030", "2050", "2050", "2050", "2050"), 
                         beverages = c(0.07, 0.02, 0.02, 0.04, 0.09, 0.02, 0.03, 0.06, 0.15, 0.03, 0.05, 0.09), 
                         dairy = c(8.2, 6.46, 5.78, 0, 9.1, 7.16, 6.42, 0, 11.7, 9.21, 8.25, 0), 
                         fish = c(0, 0.01, 0.03, 0, 0, 0.02, 0.05, 0, 0, 0.05, 0.16, 0), 
                         nutrient = c("carbohydrate", "fat", "protein", "total_fiber", "carbohydrate", "fat", "protein", "total_fiber", "carbohydrate", "fat", "protein", "total_fiber"), stringsAsFactors = FALSE)
p <- ggRadar(data = spiderData, mapping = aes(colour = year), 
             rescale = FALSE, interactive = FALSE, use.label = TRUE, size = 2,
             legend.position = "right") + facet_wrap(~ nutrient)
p

此代码会产生以下错误消息。

merge_vars 中的错误（数据，params$plot_env，vars，drop = params$drop） ：至少一层必须包含用于分面的所有变量

感谢有关修复的建议！

如果有人需要，供参考：只需添加参数facet=nurtient当指定mapping在你的代码中

require(ggiraphExtra)
require(ggplot2)
spiderData <- data.frame(year = c("2010", "2010", "2010", "2010", "2030", "2030", "2030", "2030", "2050", "2050", "2050", "2050"), 
                     beverages = c(0.07, 0.02, 0.02, 0.04, 0.09, 0.02, 0.03, 0.06, 0.15, 0.03, 0.05, 0.09), 
                     dairy = c(8.2, 6.46, 5.78, 0, 9.1, 7.16, 6.42, 0, 11.7, 9.21, 8.25, 0), 
                     fish = c(0, 0.01, 0.03, 0, 0, 0.02, 0.05, 0, 0, 0.05, 0.16, 0), 
                     nutrient = c("carbohydrate", "fat", "protein", "total_fiber", "carbohydrate", "fat", "protein", "total_fiber", "carbohydrate", "fat", "protein", "total_fiber"), stringsAsFactors = FALSE)
p <- ggRadar(data = spiderData, mapping = aes(colour = year, facet=nutrient), 
         rescale = FALSE, interactive = FALSE, use.label = TRUE, size = 2,
         legend.position = "right")
p

> devtools::session_info()
version  R version 3.4.4 (2018-03-15)
ggplot2      * 3.0.0   2018-07-03 cran (@3.0.0)
ggiraphExtra * 0.2.9   2018-07-22 CRAN (R 3.4.4)  

edit: removed facet_wrap