r-通过从数据表中选择另一个页面来更新绘图

Question

我有一个简单的闪亮应用程序，它显示虹膜数据集的散点图。在这个图的下面有一个显示数据的表格。我想知道是否有可能以某种方式将绘图(可能还有侧边栏菜单(与表格连接起来，以便只显示该特定页面中显示的数据。

#ui.r
pageWithSidebar(
headerPanel('Iris k-means clustering'),
sidebarPanel(
selectInput('xcol', 'X Variable', names(iris)),
selectInput('ycol', 'Y Variable', names(iris),
selected=names(iris)[[2]]),
numericInput('clusters', 'Cluster count', 3,
min = 1, max = 9)
),
mainPanel(
plotOutput('plot1'),
DT::dataTableOutput('contents')
)
)
#server.r
library(shiny)
library(DT)
function(input, output, session) {
# Combine the selected variables into a new data frame
selectedData <- reactive({
iris[, c(input$xcol, input$ycol)]
})
clusters <- reactive({
kmeans(selectedData(), input$clusters)
})
output$plot1 <- renderPlot({
palette(c("#E41A1C", "#377EB8", "#4DAF4A", "#984EA3",
"#FF7F00", "#FFFF33", "#A65628", "#F781BF", "#999999"))
par(mar = c(5.1, 4.1, 0, 1))
plot(selectedData(),
col = clusters()$cluster,
pch = 20, cex = 3)
points(clusters()$centers, pch = 4, cex = 4, lwd = 4)
})
output$contents <- renderDataTable({
selectedData()
})
}

Answer 1

您需要input$tableId_rows_current，它提供当前页面上行的索引。有关更多信息，请查看DT文档。这是更新的代码-

output$plot1 <- renderPlot({
req(input$contents_rows_current)
palette(c("#E41A1C", "#377EB8", "#4DAF4A", "#984EA3",
"#FF7F00", "#FFFF33", "#A65628", "#F781BF", "#999999"))
par(mar = c(5.1, 4.1, 0, 1))
plot(selectedData()[input$contents_rows_current, ],
col = clusters()$cluster,
pch = 20, cex = 3)
points(clusters()$centers, pch = 4, cex = 4, lwd = 4)
})