R語言caret包中createFolds函數實現將向量隨機分組。
1、
> library(caret) > createFolds(1:10, k = 5) ## 將1-10隨機分為5組，返回每組的索引 $Fold1 [1] 4 5 $Fold2 [1] 1 3 $Fold3 [1] 2 7 $Fold4 [1] 8 10 $Fold5 [1] 6 9 > createFolds(1:10, k = 5) ## 從1-10中隨機抽取5組，返回每組的索引，而且返回的索引沒有重復 $Fold1 [1] 2 4 $Fold2 [1] 5 8 $Fold3 [1] 7 10 $Fold4 [1] 1 9 $Fold5 [1] 3 6
2、
> createFolds(1:10, k = 2) $Fold1 [1] 2 3 5 6 8 $Fold2 [1] 1 4 7 9 10 > createFolds(1:10, k = 2) ## 有的時候並不能均勻分組 ？？ $Fold1 [1] 2 5 7 8 $Fold2 [1] 1 3 4 6 9 10 > createFolds(1:10, k = 2) ## 沒有均勻分組？？ $Fold1 [1] 1 2 5 6 9 10 $Fold2 [1] 3 4 7 8 > createFolds(1:10, k = 2) $Fold1 [1] 3 4 7 8 $Fold2 [1] 1 2 5 6 9 10