我正在尝试让一个简单的Shiny应用程序工作(这将是更大的事情的开始)。我的问题是服务器中的子集数据。应用程序的R部分似乎对我根本不起作用。
错误消息为:
eval(expr、envir、enclos)中出错:找不到对象"localA3"
这是我的服务器。R文件:
# server.R
library(ggmap)
library(scales)
library(grid)
localA <- read.csv("local7.csv", header=TRUE)
shinyServer(
function(input, output) {
output$map <- renderPlot({
sub <- switch(input$sub,
"a" = "a",
"b" = "b",
"c" = "c")
opt <- switch(input$opt,
"data" = "data",
"obs" = "obs")
localx = reactive({
x <- subset(localA, factor==paste(sub))
return(x)
})
localA3 <- localx()
testmapA <- qmap("England", zoom = 6, color = "bw", legend = "topleft")
testmapA +
geom_point(aes(x = lon, y = lat, colour = localA3$opt, size = localA3$opt), data = localA3)
})
}
)
这是我的UI.R文件:
# UI.R
shinyUI(fluidPage(
titlePanel("A Shiny Example"),
sidebarLayout(
sidebarPanel(
helpText("Create maps with random data for UK local authorities."),
selectInput("sub",
label = "Choose a category to display",
choices = c("a", "b", "c"),
selected = "a"),
selectInput("opt",
label = "Choose a variable to display",
choices = c("data", "obs"),
selected = "data"),
sliderInput("range",
label = "Range of interest:",
min = 0, max = 100, value = c(0, 100))
),
mainPanel(plotOutput("map"))
)
))
无论出于什么原因,R告诉我它找不到对象"localA3"。我现在已经尝试用许多不同的方式对代码的子集部分进行编程——从函数上的反应表达式到简单的R代码。Shiny之外的功能在服务器中不起作用。R程序。
有人能告诉我我可能做错了什么吗?
我的基本数据集"local7.csv"的前十个条目如下:
lon lat data obs factor
1 -0.1277583 51.5073509 87.828234 20.49259318 a
2 0.1293497 51.5464828 68.79663358 98.0480588 a
3 -0.1997 51.6444 24.35460542 76.77994522 b
4 0.154327 51.439933 71.51349632 28.05491455 a
5 -0.2710568 51.5672808 91.31933313 69.15576621 c
6 0.013156 51.406025 57.98920169 56.12171479 a
7 -0.1588255 51.5517059 45.68928313 29.73514486 a
8 -0.098234 51.376165 29.47027315 96.1460748 b
9 -0.3415002 51.5250257 36.46005588 76.66948508 c
10 -0.0837 51.6516 43.57721438 50.65123884 c
您需要将aes
调用更改为aes_string
,并使所有元素都为字符串,以便与geom_point
保持一致。在同时使用对象和字符串之前。下面的小变化在你的最后uiR对我有效。
testmapA +
geom_point(aes_string(x = "lon", y = "lat", colour = input$opt, size = input$opt), data = localA3)