#Matrix
A<-matrix(c(1,2,3,4,6,7,8,9,0), nrow=3, ncol=3);
print(A)
##      [,1] [,2] [,3]
## [1,]    1    4    8
## [2,]    2    6    9
## [3,]    3    7    0
A<-matrix(c(1,2,3,4,6,7,8,9,0), nrow=3, ncol=3, dimnames=list(c("X","Y","Z"), c("A","S","D")))
print(A)
##   A S D
## X 1 4 8
## Y 2 6 9
## Z 3 7 0
attributes(A);
## $dim
## [1] 3 3
## 
## $dimnames
## $dimnames[[1]]
## [1] "X" "Y" "Z"
## 
## $dimnames[[2]]
## [1] "A" "S" "D"
class(A);
## [1] "matrix" "array"
colnames(A);
## [1] "A" "S" "D"
rownames(A);
## [1] "X" "Y" "Z"
B<- rbind (A, c(1,2,3),c(4,5,6));
print(B);
##   A S D
## X 1 4 8
## Y 2 6 9
## Z 3 7 0
##   1 2 3
##   4 5 6
C<- cbind(A, c(1,2,3), c(4,5,6));
print(C);
##   A S D    
## X 1 4 8 1 4
## Y 2 6 9 2 5
## Z 3 7 0 3 6
A[1,];
## A S D 
## 1 4 8
A[,1];
## X Y Z 
## 1 2 3
A[-3,]; # except row3
##   A S D
## X 1 4 8
## Y 2 6 9
A[2,2];#second row second colum
## [1] 6
A[c(TRUE, FALSE, TRUE),]; #first row is true, second row is true, third row is true Only one and three row appears
##   A S D
## X 1 4 8
## Z 3 7 0
A[2,2]<-100;
print(A)
##   A   S D
## X 1   4 8
## Y 2 100 9
## Z 3   7 0
A[A>4];
## [1] 100   7   8   9
B<-rbind(A, c(1,2,3),c(4,4,5));
print(B);
##   A   S D
## X 1   4 8
## Y 2 100 9
## Z 3   7 0
##   1   2 3
##   4   4 5
C<-cbind(A, c(1,2,3), c(4,5,6));
print(C);
##   A   S D    
## X 1   4 8 1 4
## Y 2 100 9 2 5
## Z 3   7 0 3 6

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