Question

我正在尝试在Shiny中建立血压评估工具，该工具将提供与人的血压数据相关的指导。

这是我的ui.R
库（有光泽）

shinyUI(fluidPage(
    titlePanel("Blood pressure assessment"),

    fluidRow(
            column(3,
                   h3("Systolic BP"),
                   h4("The first/top number"),
                   sliderInput("x1", label = "mm Hg", min = 90, max = 200,
                               value = 90, animate = TRUE)),
            column(3,
                   h3("Diastolic BP"),
                   h4("The second/bottom number"),
                   sliderInput("x2", label = "mm HG", min = 50, max = 120, 
                               value = 50, animate = TRUE))),
            column(3,
                   h4("Your range"),
                   verbatimTextOutput("ranges")),
            column(3,
                   br(),
                   actionButton("submit", "Submit"))))

这是我的server.R文件

shinyServer(function(input, output) {
    function(ranges) { reactiveValues(normal = "Normal Range",
                             caution = "Caution Range = Prehypertension",
                             high = "High Range = Stage 1 Hypertension",
                             very = "Very High Range = Stage 2 Hypertension")}
    dataInput <- reactive({
    if(input$x1 > 160){return()} else{
            if(input$x2 > 100){return("very")}
    }

    if(input$x1 == 140:159){return()} else{
            if(input$x2 == 90:99){return("high")}
    }

    if(input$x1 == 120:139){return()} else{
            if(input$x2 == 80:89){return("caution")}
    }
    if(input$x1 < 120){return()} else{
            if(input$x2 > 80) {return("normal")}
    }
    })

    observeEvent(input$submit, {

            output$ranges <- renderPrint({ranges(input$x1, input$x2)})

            })
}
    )

我尝试运行应用程序时返回的响应是

Error in func() : could not find function "ranges"

对我做错了什么的任何想法。我怀疑我使它变得比它需要的更复杂，或者我错过了一些非常明显的东西。这是我的第一个闪亮的应用程序。

Answer 1

你的问题是，你没有定义一个正确的函数来找到一个BP的状态。

以下功能根据两个输入数字为您提供输出。我不确定，如果完全正确的话。从这个意义上说，您的代码不是很明确：有systolic == 130和diastolic == 70 "Prehypertension"的人，或者什么都没有？

我在下面定义了以下函数：如果两个值分别低于120和80，则返回"Normal Range"。如果任一值分别高于160或100，则返回"Very High Range = Stage 2 Hypertension"。如果任一值分别在121和139或80和89之间，则返回"Prehypertension"，依此类推。这应该是怎么回事？

# define function which gives finds blood pressure state
find_bp_state <- function(systolic, diastolic) {
  if (systolic < 120 & diastolic < 80) {
    return("Normal Range")
  } else if (systolic > 160 | diastolic > 100) {
    return("Very High Range = Stage 2 Hypertension")
  } else if (systolic %in% c(121:139) | diastolic %in% c(80:89)) {
    return("Caution Range = Prehypertension")
  } else if (systolic %in% c(140:159) | diastolic %in% c(90:99)) {
    return("High Range = Stage 1 Hypertension")
  }
}

# test function
find_bp_state(130, 82)
#> [1] "Caution Range = Prehypertension"

之后，您可以创建自己的应用程序，根据您在上面的功能定义，给出预期的结果。

出于演示目的，以下代码可在单个文件中使用。

library(shiny)

find_bp_state <- function(systolic, diastolic) {
  if (systolic < 120 & diastolic < 80) {
    return("Normal Range")
  } else if (systolic > 160 | diastolic > 100) {
    return("Very High Range = Stage 2 Hypertension")
  } else if (systolic %in% c(121:139) | diastolic %in% c(80:89)) {
    return("Caution Range = Prehypertension")
  } else if (systolic %in% c(140:159) | diastolic %in% c(90:99)) {
    return("High Range = Stage 1 Hypertension")
  }
}

ui <- fluidPage(
  titlePanel("Blood pressure assessment"),

  fluidRow(
    column(3,
           h3("Systolic BP"),
           h4("The first/top number"),
           sliderInput("x1", label = "mm Hg", min = 90, max = 200,
                       value = 90, animate = TRUE)),
    column(3,
           h3("Diastolic BP"),
           h4("The second/bottom number"),
           sliderInput("x2", label = "mm HG", min = 50, max = 120, 
                       value = 50, animate = TRUE))),
  column(3,
         h4("Your range"),
         verbatimTextOutput("ranges")),
  column(3,
         br(),
         actionButton("submit", "Submit")))

server <- function(input, output) {

  observeEvent(input$submit, {
    output$ranges <- renderPrint({
      systolic <- input$x1
      diastolic <- input$x2

      print(find_bp_state(systolic = systolic, diastolic = diastolic))
    })
  })

  }

shinyApp(server = server, ui = ui)

如果您想要ui.R和server.R，您的代码可能如下：

<强> ui.R ：

library(shiny)
shinyUI(fluidPage(
  titlePanel("Blood pressure assessment"),

  fluidRow(
    column(3,
           h3("Systolic BP"),
           h4("The first/top number"),
           sliderInput("x1", label = "mm Hg", min = 90, max = 200,
                       value = 90, animate = TRUE)),
    column(3,
           h3("Diastolic BP"),
           h4("The second/bottom number"),
           sliderInput("x2", label = "mm HG", min = 50, max = 120, 
                       value = 50, animate = TRUE))),
  column(3,
         h4("Your range"),
         verbatimTextOutput("ranges")),
  column(3,
         br(),
         actionButton("submit", "Submit")
  )
))

<强> server.R ：

library(shiny)

find_bp_state <- function(systolic, diastolic) {
  if (systolic < 120 & diastolic < 80) {
    return("Normal Range")
  } else if (systolic > 160 | diastolic > 100) {
    return("Very High Range = Stage 2 Hypertension")
  } else if (systolic %in% c(121:139) | diastolic %in% c(80:89)) {
    return("Caution Range = Prehypertension")
  } else if (systolic %in% c(140:159) | diastolic %in% c(90:99)) {
    return("High Range = Stage 1 Hypertension")
  }
}

shinyServer(function(input, output) {

    observeEvent(input$submit, {
      output$ranges <- renderPrint({
        systolic <- input$x1
        diastolic <- input$x2

        print(find_bp_state(systolic = systolic, diastolic = diastolic))
      })
    })
  }
)

Shiny中的BP评估工具无法找到功能“范围”

1 个答案: