R/app_server.R

In efradata/shinygcp: What the Package Does (One Line, Title Case)

#' App Server
#'
#' @param input Input object
#' @param output Output list
#' @param session Shiny session
app_server <- function(input, output, session) {

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

  clusters <- shiny::reactive({
    stats::kmeans(selectedData(), input$clusters)
  })

  output$plot1 <- shiny::renderPlot({
    grDevices::palette(c("#E41A1C", "#377EB8", "#4DAF4A", "#984EA3",
                          "#FF7F00", "#FFFF33", "#A65628", "#F781BF", "#999999"))

    graphics::par(mar = c(5.1, 4.1, 0, 1))
    graphics::plot(selectedData(),
                   col = clusters()$cluster,
                   pch = 20, cex = 3)
    graphics::points(clusters()$centers, pch = 4, cex = 4, lwd = 4)
  })

}