treec50<-C5.0Control(subset =F,CF=0.25,winnow=F,noGlobalPruning=F,minCases =20)
> model <- C5.0(流失19Q3 ~生命周期19Q2+R19Q2+连购19Q2+最近周期比19q2+议价变化19q2+
+                   频次变化19q2+购油变化19q2+购买期间空缺季数,data=train,rules=F,control =treec50)
Error in apply(x, 1, paste, collapse = ",") :
  dim(X) must have a positive length