[英]R Shiny: Create a button that updates a data.frame
I have a randomly generated data.frame. 我有一个随机生成的data.frame。 The user can modify a slider to choose the number of points.
用户可以修改滑块以选择点数。 Then I plot this data.frame.
然后,我绘制此data.frame。
I want to add a button than when clicked, it performs a modification in the previous randomly generated data.frame (but without regenerating the data.frame). 我想添加一个按钮,而不是单击按钮,它会在先前随机生成的data.frame中执行修改(但不重新生成data.frame)。 The modification is a voronoid relaxation, and it should be performed once per each time the button is clicked and the graph generated.
修改是一种类涡流松弛,每次单击按钮并生成图形时,都应执行一次。
Until now, I have not achieved anything similar... 到目前为止,我还没有取得任何类似的成就...
ui.R 用户界面
library(shiny)
# Define UI for application that draws a histogram
shinyUI(fluidPage(
# Application title
titlePanel("Map Generator:"),
# Sidebar with a slider input for the number of bins
sidebarLayout(
sidebarPanel(
p("Select the power p to generate 2^p points."),
sliderInput("NumPoints",
"Number of points:",
min = 1,
max = 10,
value = 9),
actionButton("GenPoints", "Generate"),
actionButton("LloydAlg", "Relaxe")
),
# Show a plot of the generated distribution
mainPanel(
plotOutput("distPlot",height = 700, width = "auto")
)
)
))
server.R 服务器
library(shiny)
library(deldir)
shinyServer(function(input, output) {
observeEvent(input$NumPoints,{
x = data.frame(X = runif(2^input$NumPoints,1,1E6),
Y = runif(2^input$NumPoints,1,1E6))
observeEvent(input$LloydAlg, {
x = tile.centroids(tile.list(deldir(x)))
})
output$distPlot <- renderPlot({
plot(x,pch = 20,asp=1,xlim=c(0,1E6),ylim = c(0,1E6))
})
})
})
Of course there is something that I must be doing wrong, but I am quite new into shiny I can't figure it out what I am doing wrong... 当然,有些事情我一定做错了,但是我很新,无法弄清楚自己做错了什么...
This should work (even though I am pretty sure this could be improved): 这应该工作(即使我很确定这可以改善):
shinyServer(function(input, output) {
library(deldir)
data = data.frame(
X = runif(2^9, 1, 1E6),
Y = runif(2^9, 1, 1E6)
)
rv <- reactiveValues(x = data)
observeEvent(input$GenPoints, {
rv$x <- data.frame(
X = runif(2^input$NumPoints,1,1E6),
Y = runif(2^input$NumPoints,1,1E6)
)
})
observeEvent(input$LloydAlg, {
rv$x = tile.centroids(tile.list(deldir(rv$x)))
})
output$distPlot <- renderPlot({
plot(rv$x,pch = 20,asp=1,xlim=c(0,1E6),ylim = c(0,1E6))
})
})
So first I initialize the points to plot. 因此,首先我初始化要绘制的点。 I use
runif(2^9, 1, 1E6)
because the starting value of the sliderInput
is 9 all the time. 我使用
runif(2^9, 1, 1E6)
因为sliderInput
都是9。
I also removed the observeEvent
from the sliderInput
and moved it to the GenPoints actionButton
. 我还从
sliderInput
移除了observeEvent
,并将其移至GenPoints actionButton
。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.