问题描述
多年来,这一直困扰着我。
我有一个函数,其中第一个参数必须采用以下形式
function(data~ group_variable)
或function(data,group = data$group_variable)
形式。
我已经在控制台中顺利运行了此功能,但是它对于我闪亮的应用程序是不可或缺的,并且困扰了我很多年了,因为数据和组都是用户选择的反应对象,因此需要使用形式:
function(datasetinput() ~ !!input$group_variable)
或某些版本。
我无法找到!!
,enquo()
,substitute()
,as.function(substitute())
等的任何组合,以使其在闪亮的应用程序中起作用。 as.Formula(substitute(data ~ group))
可在控制台中使用。
这是我可以做的最少的事情:
library(shiny)
library(shinyWidgets)
library(psych)
library(dplyr)
library(gt)
use <- function(name) {
# consider future support for .json?
if (grepl(".csv",name)) {
readr::read_csv(name)
} else if (grepl(".xlsx",name)) {
readxl::read_xlsx(name)
} else if (grepl(".dta",name)) {
haven::read_dta(name)
} else if (grepl(".sav",name)) {
haven::read_spss(name)
} else if (grepl(".rda",name)) {
load(name)
} else {
stop("unkNown data type.")
}
}
ui <- fluidPage(
mainPanel(
fileInput("FileInput","Input Your Data Set"),helpText("Dataset must be one of: .csv,.sav,.dta,.xlsx,or .rda"),materialSwitch(
inputId = "ext_desc",label = "Extended Description",value = FALSE,status = "primary"
),materialSwitch(
inputId = "desc_by_group_bool",label = "Describe By A Group",varSelectInput(
inputId = "desc_group",label = "Select A Group",data = NULL,width = "400px"
),gt::gt_output("description")
)
)
server <- function(input,output,session){
datasetInput <- reactive({
infile <- input$FileInput
if (is.null(infile))
return(NULL)
dat<-use(infile$datapath)
names(dat) <- gsub(" ","_",names(dat),fixed = TRUE)
return(dat)
})
observeEvent(datasetinput(),{
updateVarSelectInput(session,"desc_group",data = datasetinput())
})
desc <- reactive({
req(datasetinput())
if (input$desc_by_group_bool == FALSE) {
datasetinput() %>%
#select_if(is_numeric) %>%
psych::describe(.,fast = !(input$ext_desc),omit = TRUE) %>%
add_rownames(var = "Variable") %>%
dplyr::select(-c(vars)) %>%
dplyr::mutate(dplyr::across(is.numeric,round,2)) %>%
gt::gt() %>%
gt::tab_options(
column_labels.font.size = "small",table.font.size = "small",row_group.font.size = "small",data_row.padding = px(3)
) %>%
gt::tab_header(title = paste0("Data Description"))
} else {
# datasetinput() %>%
# select_if(is.numeric) %>%
psych::describeBy( datasetinput() ~ !!input$desc_group,# here we get "invalid argument type" error
fast = !(input$ext_desc),mat = TRUE) %>%
tibble::rownames_to_column() %>%
select(-c(item,vars)) %>%
dplyr::mutate(dplyr::across(is.numeric,2)) %>%
arrange(group1) %>%
group_by(group1) %>%
gt() %>%
gt::tab_options(
column_labels.font.size = "small",data_row.padding = px(3)
) %>%
tab_header(title = paste0("Data Description"),subtitle = paste0("Grouped by: ",input$desc_group)
)
}
})
output$description = gt::render_gt(desc())
}
shinyApp(ui = ui,server = server)
引起错误的行以及我的问题的根源是,请原谅,上面的第85行。
解决方法
有多种方法可以解决此问题。一种方法是使用[[]]
子集特定列。因此,将describeBy
行更改为:
psych::describeBy( datasetInput(),group = datasetInput()[[input$desc_group]]
还要在where
中添加dplyr::across
dplyr::mutate(dplyr::across(where(is.numeric),round,2))