获取另一个向量的值的索引？

Question

我猜这是重复的,但我找不到,所以这里...

我想首先返回第二个索引:

first = c( "a" , "c" , "b" )
second = c( "c" , "b" , "a" )
result = c( 2 , 3 , 1 )

我保证第一个和第二个具有唯一值,并且两者之间具有相同的值.

Answer 1

获取值的索引match()是为了什么.

 first = c( "a" , "c" , "b" )
 second = c( "c" , "b" , "a" )
 match(second, first)
 [1] 2 3 1