r - R中的过采样示例错误

Question

我在下面运行 R 中过采样的代码

varNames1 = paste0("Quote.Type","+","Quote.State","+","Forecast.Type","+","Suggested.Reseller.Discount","+","Territory","+","Pricing.Type")

ctrl <- trainControl(method = "repeatedcv", 
                                           number = 10, 
                                           repeats = 10, 
                                           verboseIter = FALSE,
                                           sampling = "up")

set.seed(42)
model_rf_under <- caret::train(renew.dev$Result ~ varNames1,
                               data = renew.dev,
                               method = "rf",
                               preProcess = c("scale", "center"),
                               trControl = ctrl)

这对我来说是错误的。任何人都可以请帮忙。

Error in model.frame.default(form = renew.dev$Result ~ varNames1, data = renew.dev,  : 
  variable lengths differ (found for 'varNames1')