server.R

# This is the server logic for a Shiny web application.
# You can find out more about building applications with Shiny here:
# http://shiny.rstudio.com
library(shiny)
#if (!require("actuar")) install.packages("actuar")
library(actuar)

shinyServer(function(input, output) {
 output$distPlot <- renderPlot({
 # generate values of the ZIP distribution based on input$mu from ui.R
 x <- seq(1, input$xmax, 1)
 y <- dztpois(x, lambda=input$lambda)
 # draw the histogram with the specified number of bins
 barplot(y, main='Diagrama de barras para las probabilidades',
         xlab='x', ylab=expression(P(X==x)), las=1, col='deepskyblue3',
         names.arg = x, ylim=c(0, 1))
 grid()
   })
})