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You can use only your personal handwritten notes and the help window of RStudio. All questions are independent and can be answered in any order. Some question can be answered in more than one way. Only one correct answer is required.

IMPORTANT: Write your student number in the correct place at the beginning of the answer file.

1 Using R

1.1 Write R commands to make a vector with 40 odd numbers starting from 3

# write your answer here
 [1]  3  5  7  9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47
[24] 49 51 53 55 57 59 61 63 65 67 69 71 73 75 77 79 81

1.2 Write R commands to make a vector with 50 copies of the number 1

# write your answer here
 [1] 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
[36] 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

1.3 Write R commands to produce this vector

# write your answer here
[1] "a" "b" "b" "c" "c" "c"

1.4 Write R commands to produce this vector

# write your answer here
[1] red   white black blue  brown
Levels: black blue brown red white

1.5 Write the R commands to test which elements of state.area are greater than 1E5

# write your answer here
 [1] FALSE  TRUE  TRUE FALSE  TRUE  TRUE FALSE FALSE FALSE FALSE FALSE
[12] FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE
[23] FALSE FALSE FALSE  TRUE FALSE  TRUE FALSE FALSE  TRUE FALSE FALSE
[34] FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE  TRUE FALSE
[45] FALSE FALSE FALSE FALSE FALSE FALSE

2 Using indices

2.1 Show the first 5 elements of the vector state.abb

# write your answer here
[1] "AL" "AK" "AZ" "AR" "CA"

2.2 Show all the elements of the vector state.abb, except the first 30

# write your answer here
 [1] "NM" "NY" "NC" "ND" "OH" "OK" "OR" "PA" "RI" "SC" "SD" "TN" "TX" "UT"
[15] "VT" "VA" "WA" "WV" "WI" "WY"

2.3 Show the elements of the vector state.name corresponding to states whose area is greater than 1e5

# write your answer here
[1] "Alaska"     "Arizona"    "California" "Colorado"   "Montana"   
[6] "Nevada"     "New Mexico" "Texas"

2.4 Create a vector with the values 1, 2, 3, and 4, and with names “one”, “two”, “three”, and “four”.

Assign this vector to the variable x. Then show the content of x

# write your answer here
  one   two three  four 
    1     2     3     4

2.5 Using the name as index, show the value of two in the vextor x

# write your answer here
two 
  2

3 About Computing

Please answer the following questions:

3.1 What is a computer? what are computers useful for?

REPLACE THIS WITH YOUR ANSWER

3.2 What are the parts of a computer?

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3.3 How do computers represent information?

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3.4 What is a prompt? What is the interpretation?

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3.5 Can you use Microsoft Word for scientific computing?

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3.6 What are the advantages of Markdown as a way to represent documents?

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4 About R

Please answer the following questions:

4.1 Which are the basic data types in R?

REPLACE THIS WITH YOUR ANSWER

4.2 What is the meaning of NA? Why it is useful?

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4.3 What types of data can be used as indices of vectors in R? What are the advantages of each one?

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