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| library(shiny) | |
| source("auxiliar.R") | |
| shinyServer(function(input, output) | |
| { | |
| output$grafico1 <- renderPlot({ | |
| res <- pdf(a=input$min, | |
| b=input$max, | |
| cuantil=input$cuantil, | |
| pdf=input$pdf) | |
| area <- res$area | |
| fun <- res$fun | |
| if (input$min > input$max | area > 1.01 | area < 0.99) { | |
| plot(c(-5, 5), c(0, 1), xlab="", ylab="", type='n', | |
| xaxt='n', yaxt='n', bty='n') | |
| text(x=0, y=0.7, col='red', cex=2, | |
| label='Revise los valores que ingres贸.') | |
| text(x=0, y=0.5, col='orange', cex=1.5, | |
| label=paste('El 谩rea bajo la curva es', area)) | |
| text(x=0, y=0.3, col='purple', cex=1, | |
| label='El m铆nimo no puede ser mayor que el m谩ximo.') | |
| } | |
| else { | |
| par(mfrow=c(1, 2)) | |
| # Para dibujar f(x) | |
| secuencia <- seq(input$min, input$max, length.out=1000) | |
| cord.x <- c(input$min, secuencia, input$max) | |
| cord.y <- c(0, fun(secuencia), 0) | |
| curve(fun, from=input$min, to=input$max, lwd=6, las=1, | |
| col="steelblue", | |
| ylim=c(0, max(fun(secuencia))), | |
| xlab="X", ylab="f(x)", | |
| main="Funci贸n de densidad") | |
| grid() | |
| # Para dibujar F(x) | |
| Fun <- function(x) | |
| integrate(fun, lower=input$min, upper=x)$value | |
| Fun <- Vectorize(Fun) | |
| curve(Fun, from=input$min, to=input$max, lwd=6, las=1, | |
| col="steelblue", | |
| #ylim=c(0, max(fun(secuencia))), | |
| xlab="X", ylab="F(x)", | |
| main="Funci贸n acumulada") | |
| grid() | |
| } | |
| }) | |
| output$med_var <- renderText({ | |
| res <- pdf(a=input$min, | |
| b=input$max, | |
| cuantil=input$cuantil, | |
| pdf=input$pdf) | |
| area <- res$area | |
| fun <- res$fun | |
| f1 <- function(x) x * fun(x) | |
| esperanza <- integrate(f1, lower=input$min, upper=input$max)$value | |
| f2 <- function(x) x^2 * fun(x) | |
| varianza <- integrate(f2, lower=input$min, upper=input$max)$value | |
| varianza <- varianza - esperanza^2 | |
| if (input$min > input$max | area > 1.01 | area < 0.99) { | |
| paste(c("Hay algo errado!!!")) | |
| } | |
| else { | |
| paste0(c("La v.a. X tiene E(X)=", | |
| round(esperanza, 4), | |
| " y Var(X)=", | |
| round(varianza, 4) | |
| ), | |
| collapse="" | |
| ) | |
| } | |
| }) | |
| output$prob_hasta_cuantil <- renderText({ | |
| res <- pdf(a=input$min, | |
| b=input$max, | |
| cuantil=input$cuantil, | |
| pdf=input$pdf) | |
| area <- res$area | |
| fun <- res$fun | |
| # Acumul | |
| Fun <- function(x) | |
| integrate(fun, lower=input$min, upper=x)$value | |
| result_prob <- ifelse(input$cuantil <= input$min, | |
| 0, | |
| ifelse(input$cuantil > input$max, | |
| 1, | |
| Fun(input$cuantil))) | |
| if (input$min > input$max | area > 1.01 | area < 0.99) { | |
| paste(c("Hay algo errado!!!")) | |
| } | |
| else { | |
| paste0(c("P(X<=", input$cuantil, ")=", | |
| result_prob | |
| ), | |
| collapse="" | |
| ) | |
| } | |
| }) | |
| }) |