Question

我尝试了我的第一个Markdown博士，一切顺利，直到我收到了错误

 "Error in eval(expr, envir, enclos) : object 'input' not found"

有这个块

{r, echo=FALSE}

inputPanel(
radioButtons("category",label= "Select  Category",choices=c("diffPts","diffGF","diffGA","diffGD","diffpos"),inline = TRUE)
)
   renderPlot({
   ggplot(clubSeason, aes(x=team, y=input$category)) + geom_boxplot()
})

如果我硬编码，例如显示图表y="diffPts"。在ggplot周围放置一个print()无济于事

TIA

Answer 1

以下运行正常。 “输入$ category”的值按预期打印

---
title: "Untitled"
runtime: shiny
output: html_document
---

```{r, echo=FALSE}
library(ggplot2)
inputPanel(
   radioButtons("category",label= "Select  Category",choices=c("diffPts","diffGF","diffGA","diffGD","diffpos"),inline = TRUE)
)
renderPlot({
   print(input$category)
   ggplot(faithful, aes(x=eruptions, y=waiting)) + geom_boxplot()
})
```

更新：

问题似乎是aes函数传递了一个字符串。您可以改为使用aes_string：

renderPlot({
   ggplot(clubSeason, aes_string(x='team', y=input$category)) + geom_boxplot()
})

Rmarkdown和Shiny输入

1 个答案: