我有一个关于R Shiny应用程序的一般问题:我有一个ID列表,最终用户可以在下拉菜单中选择(selectInput
),我希望根据这个ID。换句话说,所选变量将作为参数传递给绘图函数,每次我选择不同的ID时,绘图也会更改。我能否知道这在Shiny中是否可行?我很感激,如果有人能提供类似问题的工作实例。谢谢!
答案 0 :(得分:14)
以下是一个示例工作示例,其中包含dropdown作为参数。可以在http://glimmer.rstudio.com/bishwamitrad/ggplot2browser/上查看该程序的输出:
<强> ui.R 强>
library(shiny)
library(ggplot2)
## Define UI for miles per gallon application
dataset <- diamonds
title <- "Diamonds data Analysis"
## Define UI for application that plots random distributions
shinyUI(pageWithSidebar(
## Application title
headerPanel(title),
## Sidebar with a slider input for number of observations
sidebarPanel (
sliderInput('sampleSize','Sample Size', min=1, max=nrow(dataset),
value=min(1000,nrow(dataset)),
step=500,
round=0),
selectInput('x','X',names(dataset)),
selectInput('y','Y',names(dataset),
names(dataset)[[2]]),
selectInput('color','Color',c('None',names(dataset))),
selectInput('shape','Shape',c('None',names(dataset))),
checkboxInput('jitter','Jitter'),
checkboxInput('smooth','Smooth'),
selectInput('facet_col','Facet Column',
c(None='.',names(dataset))),
selectInput('facet_row','Facet Row',
c(None='.',names(dataset)))
),
## Show a plot of the generated distribution
mainPanel(plotOutput('plot',height="700px"))
)
)
<强> server.R 强>
library(shiny)
library(ggplot2)
## Define server logic required to generate and plot a random distribution
shinyServer(function(input,output) {
dataset <- reactive(function(){
diamonds[sample(nrow(diamonds),input$sampleSize),]
})
output$plot <- renderPlot(function(){
p <- ggplot(dataset(),aes_string(x=input$x, y=input$y))+geom_point()
if(input$color != 'None')
p <- p + aes_string(color=input$color)
if (input$shape != 'None')
p <- p + aes_string(shape=input$shape)
facets <- paste(input$facet_row, '~', input$facet_col)
if (facets != '. ~ .')
p <- p + facet_grid(facets)
if (input$jitter)
p <- p + geom_jitter()
if (input$smooth)
p <- p + geom_smooth()
print(p)
})
})