我使用闪亮来从特定文件夹上传不同的数据文件,并根据某个列绘制直方图。每个文件的名称类似于"30092017ARB.csv"
(日期+ ARB.csv)。
代码循环遍历数据文件夹中的所有文件名,并在下拉列表中打印文件名。选择文件名后,应上传并绘制mw-column
的直方图(列名为“mw”)。我的GUI如下所示:
library("shiny")
dataset <- list.files("C:/R_myfirstT/data", pattern=".*.csv$")
# Define UI for dataset viewer app ----
ui <- fluidPage(
# App title ----
titlePanel("Data plot"),
# Sidebar layout with input and output definitions ----
sidebarLayout(
# Sidebar panel for inputs ----
sidebarPanel(
# Input: Selector for choosing dataset ----
selectInput(inputId = "date",
label = "Choose a date:",
choices = dataset)
),
# Main panel for displaying outputs ----
mainPanel(
plotOutput("plot")
)
)
)
和服务器
# Define server ----
dataset <- list.files("C:/R_myfirstT/data", pattern=".*.csv$")
dat.name<-paste("C:/R_myfirstT/data/",dataset,sep = "")
server <- function(input, output) {
datasetInput <- reactive({
switch(input$dataset,
for (i in 1:length(dataset)){
toString(dataset[i])=read.csv(file=dat.name[i], header=TRUE, sep=";")
}
)
output$plot <- renderPlot({
hist(dataset.mw, breaks = 40)
})
})
}
答案 0 :(得分:1)
这样的工作:
ui.R
library("shiny")
# Define UI for dataset viewer app ----
ui <- fluidPage(
# App title ----
titlePanel("Data plot"),
# Sidebar layout with input and output definitions ----
sidebarLayout(
# Sidebar panel for inputs ----
sidebarPanel(
# Input: Selector for choosing dataset ----
selectInput(inputId = 'date',
label = 'Choose a date:',
choices = list.files(path = "./data",
full.names = FALSE,
recursive = FALSE))
),
# Main panel for displaying outputs ----
mainPanel(
plotOutput("plot")
)
)
)
server.R
# Define server ----
server <- function(input, output) {
dataset <- reactive({
infile <- input$date
if (is.null(infile)){
return(NULL)
}
read.csv(paste0('./data/',infile))
})
output$plot <- renderPlot({
x <- dataset()[,1]
hist(x, breaks = 40)
})
}