Reactive variables in Shiny for later calculations

Question

Total novice here.

I have an output that writes the result of a formula, with variables based on inputs

output$text_calc <- renderText({
    paste         


        

Answer 1

If you want to reuse this formula elsewhere, to avoid recalculating it :

server <- shinyServer(function(input, output,session){

  formula <- reactive({
    W <- input$num_W
    L <- input$num_l
    A <- input$slider_a
    W*L-A
  })


  output$text_calc <- renderText({
    paste("The result is =", formula())
  })


})