#List
A<-list("a", "b", 1, 2);
print(A)
## [[1]]
## [1] "a"
## 
## [[2]]
## [1] "b"
## 
## [[3]]
## [1] 1
## 
## [[4]]
## [1] 2
length(A);
## [1] 4
A[1];
## [[1]]
## [1] "a"
A[[2]]<- "n";
print(A)
## [[1]]
## [1] "a"
## 
## [[2]]
## [1] "n"
## 
## [[3]]
## [1] 1
## 
## [[4]]
## [1] 2

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