R Basics Exercises

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R Basics

1. Create a vector with elements 1, 2, 3. Assign to variable vec1.

#<YOUR CODE HERE>

2. Calculate the length of the vector.

#<YOUR CODE HERE>

3. What class type is the vector?

#<YOUR CODE HERE>

4. Calculate the mean.

#<YOUR CODE HERE>

5. Calculate the median.

#<YOUR CODE HERE>

6. Calculate the standard deviation.

#<YOUR CODE HERE>

7. Create a vector with elements 1 to 10. Use the : notation. Assign to variable vec2.

#<YOUR CODE HERE>

8. Create a sequence of 1 to 10. Only odd numbers. Assign to variable vec3.

#<YOUR CODE HERE>

9. create a vector from vector a repeated 10 times. Assign to vec4

#<YOUR CODE HERE>

10. Use the paste function to concatenate strings hello and world.

#<YOUR CODE HERE>

11. Use the paste0 function to concatenate strings hello and world.

#<YOUR CODE HERE>

12. Print all letters of the alphabet.

#<YOUR CODE HERE>

13. Print all letters of the alphabet in capitals.

#<YOUR CODE HERE>

14. Assign all letters of the alphabet to vec5.

#<YOUR CODE HERE>

15. Use toupper function to convert letters to capitals.

#<YOUR CODE HERE>

16. Select first element of vec5.

#<YOUR CODE HERE>

17. Select all but the first element of vec5.

#<YOUR CODE HERE>

18. Print last 6 elements of vec5.

#<YOUR CODE HERE>

19. Print last element of vec5.

#<YOUR CODE HERE>

20. Create a factor “G”, “V”, “O”, “V”, “G”. Add levels and order. Assign to fac1.

#<YOUR CODE HERE>

21. Print all elements larger than “V” from fac1.

#<YOUR CODE HERE>

22. Create vector 1, 2, 3. Assign to vec6. Add 1 to each element.

#<YOUR CODE HERE>

23. Create vector one, 2, 3. Assign to vec7. What class is this vector?

#<YOUR CODE HERE>

24. Create a data frame df1 of two columns: 1, 2, 3 and 4, 5, 6.

#<YOUR CODE HERE>

25. Add column names “col1” and “col2”.

#<YOUR CODE HERE>

26. Add column col3 that consist of vector 7, 8, 9.

#<YOUR CODE HERE>

27. Select the second column by index.

#<YOUR CODE HERE>

28. Select the second column by name.

#<YOUR CODE HERE>

29. Select the first column by index in [, ] notation.

#<YOUR CODE HERE>

30. Select the third column by index in [, ] notation.

#<YOUR CODE HERE>

31. Create df2 with columns col4, col5 and col6. Assign to vectors c(10, 11, 12), c(13, 14, 15), c(16, 17, 18).

#<YOUR CODE HERE>

32. Sum the data frames df1 and df2.

#<YOUR CODE HERE>

33. Add 1 to all values of col3.

#<YOUR CODE HERE>

34. Print col3.

#<YOUR CODE HERE>

35. Add 1 to all values of col3 and save to df3.

#<YOUR CODE HERE>

36. Print the build in data frame iris.

#<YOUR CODE HERE>

37. Get help on data frame iris.

#<YOUR CODE HERE>

38. Print the Petal Length by index.

#<YOUR CODE HERE>

39. Print the second row from the third column.

#<YOUR CODE HERE>

40. Print the Petal Length by column name.

#<YOUR CODE HERE>

41. Print the second item from the column Petal Length.

#<YOUR CODE HERE>

42. Print the max Petal Length.

#<YOUR CODE HERE>

43. Print a logical vector for all the values in Petal Length equal to the max value.

#<YOUR CODE HERE>

44. Print the row in iris corresponding to the max Petal Length.

#<YOUR CODE HERE>

45. Print summary statistics of iris.

#<YOUR CODE HERE>

46. Print summary statistics of the Petal Length column in iris.

#<YOUR CODE HERE>

47. Print all the rows equal to species virginica in iris.

#<YOUR CODE HERE>

48. Order the data frame based on Petal Length. Order ascending.

#<YOUR CODE HERE>

49. Order the data frame based on Petal Length. Order descending.

#<YOUR CODE HERE>

50. Create XY-scatter of vectors: x = c(1, 2, 3), y = c(4, 5, 6)

#<YOUR CODE HERE>

51. Create XY-scatter of iris Sepal Length against Petal With.

#<YOUR CODE HERE>

52. Again but with title and axis labels. Use whatever text you like.Blue dots.

#<YOUR CODE HERE>

53. Create histogram of iris Sepal Lenght.

#<YOUR CODE HERE>

54. Again but with breaks of 0.25

#<YOUR CODE HERE>

55. Create boxplot of iris Sepal Length and iris Sepal Width. Give labels (names) “sepal length” and “sepal width”.

#<YOUR CODE HERE>

56. Create XY-scatter with y = c(1, 2, 3) and x = c(4, 5, 6) using the formula notation.

#<YOUR CODE HERE>

57. Create a barplot of vector c(1, 2, 3).

#<YOUR CODE HERE>

58. Create a barplot of vector c(1, 2, 3). Labels (names) = a, b, c.

#<YOUR CODE HERE>

59. Print the build in data frame ChickWeight.

#<YOUR CODE HERE>

60. Create XY-scatter of weight plotted against Time from data frame ChickWeight. Use formula notation.

#<YOUR CODE HERE>

61. Create a linair regression model. Print model to screen.

#<YOUR CODE HERE>

62. Create XY-scatter of weight plotted against Time from data frame ChickWeight. Use formula notation. Display the regression line.

#<YOUR CODE HERE>

63. Plot the iris Sepal Length against Sepal Width in blue. Also add a second series to the plot.this should be Petal Length against Petal Width in red.

#<YOUR CODE HERE>

64. Create a line plot of x = c(1, 2, 3) and y = c(4, 5, 6) in blue.Add second series x = c(1, 2, 3) and y = c(5, 5.5, 6) in red.

#<YOUR CODE HERE>

The end…

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