#Data Frame
A <- data.frame(emp_id=c(1,2,3), names=c("John", "James", "Mary"), salary=c(111.1,222.2,333.3))
print(A)
##   emp_id names salary
## 1      1  John  111.1
## 2      2 James  222.2
## 3      3  Mary  333.3
typeof(A);
## [1] "list"
class(A);
## [1] "data.frame"
ncol(A);
## [1] 3
nrow(A);
## [1] 3
str(A);
## 'data.frame':    3 obs. of  3 variables:
##  $ emp_id: num  1 2 3
##  $ names : chr  "John" "James" "Mary"
##  $ salary: num  111 222 333
A["names"];
##   names
## 1  John
## 2 James
## 3  Mary
A$names;
## [1] "John"  "James" "Mary"
A[[2]];
## [1] "John"  "James" "Mary"
A[2];
##   names
## 1  John
## 2 James
## 3  Mary
A[1,2]<-"James";
print(A);
##   emp_id names salary
## 1      1 James  111.1
## 2      2 James  222.2
## 3      3  Mary  333.3
B<- rbind(A, list(4, "John", 444.4));
print(B)
##   emp_id names salary
## 1      1 James  111.1
## 2      2 James  222.2
## 3      3  Mary  333.3
## 4      4  John  444.4
B<- cbind(A, state=c("NY", "NY", "NY"));
print(B);
##   emp_id names salary state
## 1      1 James  111.1    NY
## 2      2 James  222.2    NY
## 3      3  Mary  333.3    NY

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