library(class)
train.X =rbind(wine.factor[1:30,],wine.factor[60:95,],wine.factor[131:153,])
train.Y =rbind(wine.labels[1:30,],wine.labels[60:95,],wine.labels[131:153,])
test.X  =rbind(wine.factor[31:59,],wine.factor[96:130,],wine.factor[154:178,])
test.Y  =rbind(wine.labels[31:59,],wine.labels[96:130,],wine.labels[154:178,])
test.Y[is.na(test.Y)] = 0
length(train.X)
length(train.Y)
length(test.Y)
length(test.X)

> length(train.Y)
[1] 108
> length(test.Y)
[1] 105
train。y和test.y的length不一样