Question

我一直在尝试用Shiny开发一个带有选择性输入的交互式箱形图。

当前代码：

library(shiny)

shinyUI(fluidPage(

  titlePanel("Sample 1"),

  sidebarLayout(
    sidebarPanel(
      selectInput("p", "Choose your salaries", choices = c("low"='a',"mid"='b',"high"='c',"riches!"='d'), selected = 4)
    ),
    mainPanel(
      plotOutput("boxplot")
    )
  )


))



library(shiny)
read.csv("Salaries.csv")

Categories <- cut (Salaries$TotalPay, breaks = c(0,36466,73678,104359,567595), labels = c("low","mid","high","riches!"))

shinyServer(function(input, output){

  output$boxplot <- renderPlot({

    if(input$p=='a'){
      i<"1"

    }

    if(input$p=='b'){
      i<-"2"
    }

    if(input$p=='c'){
      i<-"3"
    }

    if(input$p=='d'){
      i<- "riches!"
    }


    boxplot(TotalPay~Categories[i])

  })
})

我无法让boxplot对UI中的选择作出反应。我怀疑它与我打电话时的等级有关：

> Categories["riches!"]
[1] <NA>
Levels: low mid high riches!

” 我需要为这些添加因子吗？还是我完全忽略了这一点？提前谢谢！

Answer 1

看看如何access the column by name。以下示例使用mtcars数据集

library(shiny)

ui <- fluidPage(
  selectInput("p","p",choices = names(mtcars)),
  plotOutput("myplot"))

server <- function(input, output, session) {

  output$myplot <- renderPlot({
    boxplot(mtcars[,input$p])
    })
}

shinyApp(ui, server)

使用Shiny制作一个boxplot交互式

1 个答案: