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我有一個閃亮的應用程序,我希望用戶能夠上傳自己的數據並運行gbm模型。上傳的數據庫將是所有預測變量和響應變量的數據框。這將要求用戶輸入響應變量作爲被動輸入,或從列名稱列表中選擇它。這裏是我到目前爲止已經試過:有光澤的應用程序gbm模型公式的反應響應變量
library(shiny)
library(gbm)
ui <- fluidPage(
fluidRow(
column(3,textInput("response","Enter the response variable",value="Petal.Width")),
column(9,verbatimTextOutput("summary"))
)
)
server <- function(input, output, session) {
output$summary <- renderPrint({
model<-gbm(input$response~., data=iris,
distribution="gaussian",
bag.fraction=.5,
n.trees=1000,
interaction.depth=4,
shrinkage=0.01,
n.minobsinnode=10,
verbose=FALSE)
summary(model)
})
}
shinyApp(ui=ui,server=server)
但我得到一個可變長度不同的錯誤:
Warning: Error in model.frame.default: variable lengths differ (found for 'Sepal.Length')
Stack trace (innermost first):
90: model.frame.default
89: model.frame
88: eval
87: eval
86: gbm
85: renderPrint [D:/Dropbox/PhD/Nitrate Mapping Project/USGS Project/SOPs and Test Data/1SE SOP/gbm_reac_response.R#15]
84: func
83: eval
82: eval
81: withVisible
80: evalVis
79: utils::capture.output
78: paste
77: origRenderFunc
76: output$summary
1: runApp