執行R代碼時出錯「無法強制類型'環境'類型爲'字符'的向量」

Question

require(shiny) 
setwd("C://Users//Harshad//Desktop//Equiskill - BA") 
cars <- read.table(file = "cars.csv", sep = ",", header = TRUE, quote="") 

var_list <- as.character(names(cars)) 


ui <- fluidPage 
(
    selectInput(inputId = "var",label = "Select Dependent Variable:",choices = c(var_list)) 
) 

server <- function(input,output) 
{ 
} 

shinyApp(ui <- ui, server <- server) 

我得到錯誤「錯誤：無法脅迫類型'環境'在R studio上面閃亮的應用程序代碼。請幫我解決問題。

Answer 1

您應該避免在函數名後放置newlines甚至spaces。請參閱style guide或here。下面的代碼完美無缺。

require(shiny) 
# load your data I am using default mtcars data here 
cars <- mtcars 

var_list <- as.character(names(cars)) 

ui <- fluidPage(
     selectInput(inputId = "var",label = "Select Dependent Variable:", choices = c(var_list)) 
    ) 

server <- function(input,output) 
{ 
} 

shinyApp(ui = ui, server = server)