Error when trying to run Shiny code - Please help!

[benjheindl]

Hello,

I am getting the following error when I try to run a line of code:

Error in shinyApp(ui = ui, server = server) : object 'server' not found

I am very new to programming to I apologize ahead of time for any simple mistakes

Here is all of my code:

At a high level, we want to create a scatter plot, where the user can select what is the x axis and the y axis of the scatter plot.

The size and color will be represented by the year attribute, and the user will be able to choose one of the following (for the x and the y axis):
new_sp_m014
new_sp_f014
new_sp_m65
new_sp_f65

library(shiny)
library(ggplot2)
library(tidyverse)

The file is: "https://intro-datascience.s3.us-east-2.amazonaws.com/who.csv" and store it in the tb dataframe

tb <- read.csv('https://intro-datascience.s3.us-east-2.amazonaws.com/who.csv')
glimpse(tb)

First, remove na's from iso2

tb = tb[!is.na(tb$iso2),]

Now create the dataframe 'tbCan', which is the iso2 for canada (CA)

tbCan = tb[tb$iso2=="CA",]

We will need the imputeTS package (only install if needed)

#install.packages('imputeTS')
library(imputeTS)

Now we can use 'na_interpolation for new_sp_m014

tbCan2 = tb[tb$iso2=="CA",]
tbCan$new_sp_m014 = na_interpolation(tbCan2$new_sp_m014)

Create the User Interface of our shiny app

Define the sidebarPanel, which is two choices (use 'selectInput'), one for the x axis of the scatter plot, and the other is the y axis for the scatter plot. (make sure to library shiny).

sidePanel <- sidebarPanel(
    selectInput(inputId = "y", label = "y axis",
                c("new_sp_m014", "new_sp_f014", "new_sp_m65", "new_sp_f65")))

Create the mainPanel to show the scatter plot.

mainPanel <-  mainPanel(
    plotOutput("plot")
        )

Define UI for application (called ui)

Use a 'fluidPage' using the sidebarLayout, and your sidePanel and mainPanel

ui <- fluidPage(

    # Application title
    titlePanel("Exploring Data"),

    # Sidebar with a slider input for number of bins 
    sidebarLayout(

         #add the slider
        sidePanel,
          selectInput(inputId = "x",label = "x axis",
                      c("new_sp_m014", "new_sp_f014", "new_sp_m65", "new_sp_f65")
        )),
        
        # Show a plot of the generated distribution
        mainPanel(
          plotOutput('plot')
        )
     )

Now let's define the server

Use ggplot to render a scatter plot, using the tbCan dataframe, the input for the x-axis and the input for the y-axis.

Store the results in the 'server' variable

server <- function(input, output) {

    output$distPlot <- renderPlot({
        ggplot(data = tbCan, aes_string(x=input$x, y=input$y)) + geom_point() + theme_bw()
    })
}

Now run the shiny App

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

[benjheindl]

Update: I am no longer getting the error code. But now when I try to run the shiny app, I am not seeing a scatterplot. I am only seeing the option to select y axis and x axis from dropdown menus. It feels like I am getting closer. Still looking for advice on this. Thanks!

[scottyd22]

It looks like your output is named "distPlot", so update the mainPanel to match. Does this solve it?

mainPanel(
    plotOutput('distPlot')
  )