How do I complete this code for Shiny App? - r

Question

I am struggling in writing this shinyApp. It's main aim is to investigate on the variables of a dataset. First it produces the summary statistics on the selected variable.
In the second part; I want this app to give me the pairplot of the varibles that I have selected in the checkbox in the UI. I have used the dataset IRIS which is available to everyone, but I need the code to be adaptable to other datasets.
Can someone please help me?
library(shiny)
library(plotly)
data(iris)
ui<-fluidPage(
titlePanel("Iris"),
sidebarLayout(
sidebarPanel(
selectInput("var",label="Choose a variable",
choice=list("Sepal.Length"=1, "Sepal.Width"=2, "Petal.Length"=3, "Petal.Width"=4, "Species"=5), selectize=FALSE),
checkboxGroupInput(inputId ="independent",label = "Select independent variables", choices = names(iris)),
mainPanel(
verbatimTextOutput("sum"),
plotlyOutput('plot_id_in_ui ', height = "900px")
)
))
)
server<-function(input,output){
output$sum <- renderPrint({
summary(iris[, as.numeric(input$var)])
})
output$plot_id_in_ui <- renderplot( { "DON'T KNOW HOW TO WRITE THIS PART"
pairplot(iris, varnames, type = "both", penalty.par.val = "lambda.1se",
nvals = c(20, 20), pred.type = "response") } )
})
shinyApp(ui, server)

Answer 1

Maybe this little example can help you. It illustrates how to plot a normal R-Plot and a Plotly-Plot in a ShinyApp:
library(shiny)
library(plotly)
ui <- fluidPage(
titlePanel("Iris"),
sidebarLayout(
sidebarPanel(
selectInput("var",label="Choose a variable",
choice=list("Sepal.Length"=1, "Sepal.Width"=2, "Petal.Length"=3, "Petal.Width"=4, "Species"=5), selectize=FALSE),
checkboxGroupInput(inputId ="independent",label = "Select independent variables", choices = names(iris))
),
mainPanel(
verbatimTextOutput("sum"),
plotOutput("plot"),
plotlyOutput("plotly")
)
)
)
server <- function(input,output) {
output$sum <- renderPrint({
summary(iris[, as.numeric(input$var)])
})
output$plot <- renderPlot({
plot(iris)
})
output$plotly <- renderPlotly({
plot_ly(iris) %>%
add_trace(x=iris$Sepal.Length, y=iris$Sepal.Width, type="scatter", mode="markers")
})
}
shinyApp(ui, server)