我正在学习flexdashboard,但是我不清楚结构。
我创建了一个样本数据集,以根据所选变量在仪表板上绘制条形图。
代码如下:
---
title: "flexdashboard: Shiny Embedding"
output:
flexdashboard::flex_dashboard:
social: menu
source_code: embed
runtime: shiny
---
```{r global, include=FALSE}
library(tidyverse)
## generate a sample dataset
sample<-tbl_df(data.frame(c("City1","City2","City3","City1","City2","City3",
"City2","City3"),
c("A","B","C","D","D","A","A","B"),
c(12,14,15,12,12,14,8,10)))
colnames(sample)<-c("City","Country","Amount")
df<-
reactive(sample%>%group_by(input$variable)%>%summarise(total=sum(Amount)))
```
Column {.sidebar}
-------------------------------------------
```{r}
selectInput(inputId="variable",label="group by",choices=c("City","Country"))
```
Column
------------------------------------------
### Plot
```{r}
renderPlot({barplot(total)})
```
但是,我无法获得所需的东西。
一些建议或帮助?
答案 0 :(得分:0)
一个简单的选择是使用参数而不是反应式上下文创建函数:
makePlot <- function(groupBy) { #Instead of a reactive context
data <- sample%>%group_by(groupBy)%>%summarise(total=sum(Amount))
return(barplot(data[[groupBy]])) #Here we use a dynamic height using a variable name
}
然后从您的renderPlot
调用它:
renderPlot(makePlot(input$variable))