您如何将 shiny select 输入强制转换为数字来计算平均分？

Question

我有一个闪亮的应用程序，用户可以在其中 select 不同的选项（“”，非常低、低、中、高），我想根据他们的 select 每个部分内的离子以及总体平均值（非常低 = 1、低 = 2 等——空白选项应视为 NA）。我知道如果我在一个正常的、非反应性数据集中这样做，我可以使用 dplyr 的 case_when()，但我不确定如何为每个输入做这件事。尽管我对任何解决方案都持开放态度，但我还是很欣赏使用整洁函数的解决方案，尤其是 case_when().

实际调查有 30 个问题，所以如果可能的话，我不想单独指出每个输入（它们都以相似的词干开头，如下例所示）。最后，每个平均值应该是一个数字（不是字符串），这样我以后可以做其他计算。

感谢任何帮助！下面是一个可重现的示例来演示：

library(shiny)
library(tidyverse)
library(shinyjs)
library(shinydashboard)
library(shinyWidgets)

ui <- fluidPage(
    title = "Personalized Quiz",
    useShinyjs(),
    useShinydashboard(),
    tabsetPanel(
        tabPanel("Quiz",
                 sidebarLayout(
                     sidebarPanel(
                         h2("Section 1"),
                         selectInput("q1", "Question 1",
                                     choices = c("", "Very Low", "Low",
                                                 "Medium", "High")),
                         selectInput("q2", "Question 2",
                                     choices = c("", "Very Low", "Low",
                                                 "Medium", "High")),
                         h2("Section 2"),
                         selectInput("q3", "Question 3",
                                     choices = c("", "Very Low", "Low",
                                                 "Medium", "High")),
                         selectInput("q4", "Question 4",
                                     choices = c("", "Very Low", "Low",
                                                 "Medium", "High"))
                     ),
                     mainPanel(textOutput("section1_results"),
                               textOutput("section2_results"),
                               textOutput("overall_results"))

    ))))


server <- function(input, output) {
    
    section_1 <- reactive({
                        #create section_1 average here

    })
    
    section_2 <- reactive({
                #create section_2 average here

    })
    
    overall <- reactive({
        #create overall average here
    })
    
    output$section1_results <- renderText(paste0("Your section 1 average is ", section_1, "."))
    output$section2_results <- renderText(paste0("Your section 2 average is ", section_2, "."))
    output$overall_results <- renderText(paste0("Your overall average is ", overall, "."))
    

}

# Run the application 
shinyApp(ui = ui, server = server)

Answer 1

这是解决您的问题的方法；在 selectInputs 中，您可以将隐藏值分配给代码中显示的选项。还要确保在输出中以正确的方式引用你的反应，这意味着你在末尾包含空括号。

library(shiny)
library(tidyverse)
library(shinyjs)
library(shinydashboard)
library(shinyWidgets)

ui <- fluidPage(
  title = "Personalized Quiz",
  useShinyjs(),
  useShinydashboard(),
  tabsetPanel(
    tabPanel("Quiz",
             sidebarLayout(
               sidebarPanel(
                 h2("Section 1"),
                 selectInput("q1", "Question 1",
                             choices = c("", "Very Low" = 1, "Low" = 2,
                                         "Medium" = 3, "High" = 4)),
                 selectInput("q2", "Question 2",
                             choices = c("", "Very Low" = 1, "Low" = 2,
                                         "Medium" = 3, "High" = 4)),
                 h2("Section 2"),
                 selectInput("q3", "Question 3",
                             choices = c("", "Very Low" = 1, "Low" = 2,
                                         "Medium" = 3, "High" = 4)),
                 selectInput("q4", "Question 4",
                             choices = c("", "Very Low" = 1, "Low" = 2,
                                         "Medium" = 3, "High" = 4)),
               ),
               mainPanel(textOutput("section1_results"),
                         textOutput("section2_results"),
                         textOutput("overall_results"))
               
             ))))


server <- function(input, output) {
  
  section_1 <- reactive({
    #create section_1 average here
    mean(c(as.numeric(input$q1), as.numeric(input$q2)), na.rm = T)
  })
  
  section_2 <- reactive({
    #create section_2 average here
    mean(c(as.numeric(input$q3), as.numeric(input$q4)), na.rm = T)
  })
  
  overall <- reactive({
    #create overall average here
    mean(c(as.numeric(input$q1), as.numeric(input$q2), as.numeric(input$q3), as.numeric(input$q4)), na.rm = T)
  })
  
  output$section1_results <- renderText(paste0("Your section 1 average is ", section_1(), "."))
  output$section2_results <- renderText(paste0("Your section 2 average is ", section_2(), "."))
  output$overall_results <- renderText(paste0("Your overall average is ", overall(), "."))
  
  
}

# Run the application 
shinyApp(ui = ui, server = server)

您如何将 shiny select 输入强制转换为数字来计算平均分？

How do you coerce shiny select inputs to be numbers to calculate average score?

r

reactive-programming

shiny

dplyr

reactive