add option for density plots (#51 and #58)

Author: ebey

inst/shiny/server.R

@@ -1454,29 +1454,38 @@ output$attrhist <- renderPlot({
   if(nplots == 1){
     par(mfrow = c(1, 1))
     lvls <- length(unique(nwdf()[[attrname]]))
-    if(attrname %in% numattr() & lvls > 9){
-      tab <- hist.info(nwdf()[[attrname]], breaks = 10)
+    if(input$attrhistaxis == "density" & attrname %in% numattr() & lvls > 9){
+      plot(density(nwdf()[[attrname]]), main = attrname,
+           col = "#076EC3", lwd = 2)
     } else {
-      tab <- table(nwdf()[[attrname]])
-    }
-    if(input$attrhistaxis == "Percents"){
-      tab <- tab/sum(tab)
+      if(attrname %in% numattr() & lvls > 9){
+        tab <- hist.info(nwdf()[[attrname]], breaks = 10)
+      } else {
+        tab <- table(nwdf()[[attrname]])
+      }
+      if(input$attrhistaxis == "percent"){
+        tab <- tab/sum(tab)
+      }
+      barplot(tab, xlab = attrname, col = histblue)
     }
-    barplot(tab, xlab = attrname, col = histblue)
   } else {
     r <- ceiling(nplots/2)
     par(mfrow = c(r, 2))
     for(a in attrname){
       lvls <- length(unique(nwdf()[[a]]))
-      if(a %in% numattr() & lvls > 9){
+      if(input$attrhistaxis == "density" & a %in% numattr() & lvls > 9){
+        plot(density(nwdf()[[a]]), main = a, col = "#076EC3", lwd = 2)
+      } else {
+        if(a %in% numattr() & lvls > 9){
         tab <- hist.info(nwdf()[[a]], breaks = 10)
       } else {
         tab <- table(nwdf()[[a]])
       }
-      if(input$attrhistaxis == "Percents"){
+      if(input$attrhistaxis == "percent"){
         tab <- tab/sum(tab)
       }
       barplot(tab, xlab = a, col = histblue)
+      }
     }
   }
 })

inst/shiny/ui.R

@@ -505,9 +505,15 @@ fluidRow(
                                 dataTableOutput("attrtbl")
                                 ),
                conditionalPanel('input.attrview == "histogram"',
+                                tags$label("Type of plots"),
+                                helpText("Density plots will only be created for",
+                                         "numeric attributes with more than nine",
+                                         "levels."),
                                 selectInput("attrhistaxis",
-                                            label = "Y-axis units",
-                                            choices = c("Counts", "Percents")),
+                                            label = NULL,
+                                            choices = c("Barplot: counts" = "count",
+                                                        "Barplot: percents" = "percent",
+                                                        "Density plot" = "density")),
                                 uiOutput("attrhistplotspace"))
 
                ),