Add columns to a reactive data frame in Shiny and update them

Question

I would like to be able to calculate a new column of data based on dividing one column by another, with both original columns selected by a user input. I would like to have

Answer 1

You don't return anything in your reactive for selectedData2 you just do an incrementation <-, I think you should do this :

   function(input, output, session) {

  # Combine the selected input variables into a new data frame
  selectedData <- reactive({
    return(iris[, c(input$xcol, input$ycol),])
  })


  # divide one variable selection by the other
  selectedData2 <- reactive({
            new<-iris[, c(input$xcol)]/iris[, c(input$ycol)]
            return(new)

    })

  # create data output for selected variables
  output$view <- renderTable({selectedData()
  })

  # create data output for calculated variable
  output$view2 <- renderTable({selectedData2()
  })

}