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Home/ Questions/Why do i get the trouble with “cannot coerce type 'closure' to vector of type 'character'”?
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Atlas Murphy
  • 30
Atlas Murphy
Asked: May 18, 20222022-05-18T16:35:31+00:00 2022-05-18T16:35:31+00:00In: r

Why do i get the trouble with “cannot coerce type ‘closure’ to vector of type ‘character’”?

  • 30

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I’m building a new program, but when I run it, an error pops up. The error displayed is as follows:

Error: cannot coerce type 'closure' to vector of type 'character'

I have tried several workarounds, but they still do not get the desired results. If you have come across this situation and have a solution for the “cannot coerce type ‘closure’ to vector of type ‘character’” problem, pls let me know. Here is what I do:

library(shiny)
 
 # Define UI for dataset viewer application
 shinyUI(fluidPage(
 
 # Application title
 titlePanel("Shiny Text"),
 
 # Sidebar with controls to select a dataset and specify the
 # number of observations to view
 sidebarLayout(
  sidebarPanel(
  selectInput("dataset1", "Choose a Sepal Measure:", 
  choices = c("Sepal Length", "Sepal Width")),
 
  selectInput("dataset2", "Choose a Petal Measure:", 
  choices = c("Petal Length", "Petal Width"))
  ),
 
  # Main Scatter Plot
  mainPanel(
 
  textOutput("testvar"),
 
  plotOutput("myplot")
  )
  )
 ))
library(shiny)
 library(datasets)
 
 library(ggplot2)
 
 #Define a function to plot passed string variables in ggplot
 
 myplotfunct = function(df, x_string, y_string) {
  ggplot(df, aes_string(x = x_string, y = y_string)) + geom_point()
 }
 
 shinyServer(function(input, output) {
 
 # Sepal Inputs
 datasetInput1 <- reactive({
  switch(input$dataset1,
  "Sepal Length" = "Sepal.Length",
  "Sepal Width" = "Sepal.Width")
 })
 
 # Petal Inputs
 datasetInput2 <- reactive({
  switch(input$dataset2,
  "Petal Length" = "Petal.Length",
  "Petal Width" = "Petal.Width")
 })
 
 #Debug print value of sting being passed
 output$testvar = renderText(print(datasetInput1))
 
 # Plot
 output$myplot = renderPlot({myplotfunct(iris, datasetInput1, datasetInput2)})
 
 })

Thanks!

type 'character'
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    hdtutoria Expert
    2022-06-10T02:51:15+00:00Added an answer on June 10, 2022 at 2:51 am

    The cause: The problem is caused by the calls to datasetInput1 and datasetInput2 in the two last lines.

    The solution: To fixx this error, you should use datasetInput1() and datasetInput2(). Otherwise, R will attempt to transform the function to a char value. It should be as follows:

    #Debug print value of sting being passed
    output$testvar = renderText(print(datasetInput1()))
    
    # Plot
    output$myplot = renderPlot({myplotfunct(iris, datasetInput1(), datasetInput2())})

    Rather than interacting with the reactive element directly, the () allows you to get the value of the reactive element.

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