# Title: day 4 - vector and matrix in R
# Student name 1:
# Student name 2:
# Comments (e.g, known bugs, questions you would like Dr. Cao to go through in the class, etc):


#1. Create a vector v with the following elements: 3, 5 , 7 , 9 , 10 , 133

#2. Print second, third, and fifth element

#3. Get all elements which is larger than 8

#4. Create a 2*3 matrix m based on the previous vector v.
#   Matrix m is | 3  7  10  |
#               | 5  9  133 |

#5. Print first row of matrix m

#6. Print second column of matrix m

#7. Create data frame l with the same elements to v, assign name c1, c2, c3 to each column 
#   data frame l is    c1  c2 c3
#                     | 3  7  10  |
#                     | 5  9  133 |

#8. Print the column of l whose name is c2

#9. Create vector v2 with: 3, NA, 4, 5

#10. Removing all missing values in v2