02_variance

1. Team Emertxe
Advanced Pointers,
Arrays and Functions

2. Assignment 2

3. Assignment 2

4. Assignment 2
WAP to perform variance calculation with dynamic arrays.

5. Assignment 2
WAP to perform variance calculation with dynamic arrays.
Input: Read array size ‘N’ and read array elements of size ‘N’

6. Assignment 2
WAP to perform variance calculation with dynamic arrays.
Input: Read array size ‘N’ and read array elements of size ‘N’
Output: Print the variance

7. Assignment 2
What is variance?

8. Assignment 2
What is variance?
Variance measures how far a set of numbers is spread out.

9. Assignment 2
Example :-

10. Assignment 2
Example :-
Step 1 : Read size ‘N’

11. Assignment 2
Example :-
Step 1 : Read size ‘N’
N = 7

12. Assignment 2
Example :-
Step 1 : Read size ‘N’
N = 7
Step 2 : Dynamically allocate the memory for array ‘arr’ of size ‘N’

13. Assignment 2
Example :-
Step 1 : Read size ‘N’
N = 7
Step 2 : Dynamically allocate the memory for array ‘arr’ of size ‘N’
Step 3 : Read ‘N’ number of array elements

14. Assignment 2
Example :-
Step 1 : Read size ‘N’
N = 7
Step 2 : Dynamically allocate the memory for array ‘arr’ of size ‘N’
Step 3 : Read ‘N’ number of array elements
4 2 7 1 5 3 6
arr

15. Assignment 2
Example :-
Step 4 : Calculate Mean

16. Assignment 2
Example :-
Step 4 : Calculate Mean
4 2 7 1 5 3 6
arr

17. Assignment 2
Example :-
Step 4 : Calculate Mean
Mean = sum of all elements in ‘arr’ / size
4 2 7 1 5 3 6
arr

18. Assignment 2
Example :-
Step 4 : Calculate Mean
Mean = sum of all elements in ‘arr’ / size
Mean = 28 / 7
4 2 7 1 5 3 6
arr

19. Assignment 2
Example :-
Step 4 : Calculate Mean
Mean = sum of all elements in ‘arr’ / size
Mean = 28 / 7
Mean = 4
4 2 7 1 5 3 6
arr

20. Assignment 2
Example :-
Step 5 : Calculate Deviation (D)

21. Assignment 2
Example :-
Step 5 : Calculate Deviation (D)
4 2 7 1 5 3 6
arr

22. Assignment 2
Example :-
Step 5 : Calculate Deviation (D)
D[i] = arr[i] - Mean
4 2 7 1 5 3 6
arr

23. Assignment 2
Example :-
Step 5 : Calculate Deviation (D)
D[i] = arr[i] – Mean
4 2 7 1 5 3 6
0 1 2 3 4 5 6
i
arr

24. Assignment 2
Example :-
Step 5 : Calculate Deviation (D)
D[i] = arr[i] – Mean
D[0] = 4 – 4 = 0
4 2 7 1 5 3 6
0 1 2 3 4 5 6
i
arr

25. Assignment 2
Example :-
Step 5 : Calculate Deviation (D)
D[i] = arr[i] – Mean
D[0] = 4 – 4 = 0
4 2 7 1 5 3 6
0 1 2 3 4 5 6
i
0
D
arr

26. Assignment 2
Example :-
Step 5 : Calculate Deviation (D)
D[i] = arr[i] – Mean
4 2 7 1 5 3 6
0 1 2 3 4 5 6
i
0
D
arr

27. Assignment 2
Example :-
Step 5 : Calculate Deviation (D)
D[i] = arr[i] – Mean
D[1] = 2 – 4 = -2
4 2 7 1 5 3 6
0 1 2 3 4 5 6
i
0
D
arr

28. Assignment 2
Example :-
Step 5 : Calculate Deviation (D)
D[i] = arr[i] – Mean
D[1] = 2 – 4 = -2
4 2 7 1 5 3 6
0 1 2 3 4 5 6
i
0 -2
D
arr

29. Assignment 2
Example :-
Step 5 : Calculate Deviation (D)
D[i] = arr[i] – Mean
4 2 7 1 5 3 6
0 1 2 3 4 5 6
i
0 -2
D
arr

30. Assignment 2
Example :-
Step 5 : Calculate Deviation (D)
D[i] = arr[i] – Mean
D[2] = 7 – 4 = 3
4 2 7 1 5 3 6
0 1 2 3 4 5 6
i
0 -2
D
arr

31. Assignment 2
Example :-
Step 5 : Calculate Deviation (D)
D[i] = arr[i] – Mean
D[2] = 7 – 4 = 3
4 2 7 1 5 3 6
0 1 2 3 4 5 6
i
0 -2 3
D
arr

32. Assignment 2
Example :-
Step 5 : Calculate Deviation (D)
D[i] = arr[i] – Mean
4 2 7 1 5 3 6
0 1 2 3 4 5 6
i
0 -2 3
D
arr

33. Assignment 2
Example :-
Step 5 : Calculate Deviation (D)
D[i] = arr[i] – Mean
D[3] = 1 – 4 = -3
4 2 7 1 5 3 6
0 1 2 3 4 5 6
i
0 -2 3
D
arr

34. Assignment 2
Example :-
Step 5 : Calculate Deviation (D)
D[i] = arr[i] – Mean
D[3] = 1 – 4 = -3
4 2 7 1 5 3 6
0 1 2 3 4 5 6
i
0 -2 3 -3
D
arr

35. Assignment 2
Example :-
Step 5 : Calculate Deviation (D)
D[i] = arr[i] – Mean
4 2 7 1 5 3 6
0 1 2 3 4 5 6
i
0 -2 3 -3
D
arr

36. Assignment 2
Example :-
Step 5 : Calculate Deviation (D)
D[i] = arr[i] – Mean
D[4] = 5 – 4 = 1
4 2 7 1 5 3 6
0 1 2 3 4 5 6
i
0 -2 3 -3
D
arr

37. Assignment 2
Example :-
Step 5 : Calculate Deviation (D)
D[i] = arr[i] – Mean
D[4] = 5 – 4 = 1
4 2 7 1 5 3 6
0 1 2 3 4 5 6
i
0 -2 3 -3 1
D
arr

38. Assignment 2
Example :-
Step 5 : Calculate Deviation (D)
D[i] = arr[i] – Mean
4 2 7 1 5 3 6
0 1 2 3 4 5 6
i
0 -2 3 -3 1
D
arr

39. Assignment 2
Example :-
Step 5 : Calculate Deviation (D)
D[i] = arr[i] – Mean
D[5] = 3 – 4 = -1
4 2 7 1 5 3 6
0 1 2 3 4 5 6
i
0 -2 3 -3 1
D
arr

40. Assignment 2
Example :-
Step 5 : Calculate Deviation (D)
D[i] = arr[i] – Mean
D[5] = 3 – 4 = -1
4 2 7 1 5 3 6
0 1 2 3 4 5 6
i
0 -2 3 -3 1 -1
D
arr

41. Assignment 2
Example :-
Step 5 : Calculate Deviation (D)
D[i] = arr[i] – Mean
4 2 7 1 5 3 6
0 1 2 3 4 5 6
i
0 -2 3 -3 1 -1
D
arr

42. Assignment 2
Example :-
Step 5 : Calculate Deviation (D)
D[i] = arr[i] – Mean
D[6] = 6 – 4 = 2
4 2 7 1 5 3 6
0 1 2 3 4 5 6
i
0 -2 3 -3 1 -1
D
arr

43. Assignment 2
Example :-
Step 5 : Calculate Deviation (D)
D[i] = arr[i] – Mean
D[6] = 6 – 4 = 2
4 2 7 1 5 3 6
0 1 2 3 4 5 6
i
0 -2 3 -3 1 -1 2
D
arr

44. Assignment 2
Example :-
Step 6 : Calculate square of Deviation and store in ‘D_sqr’ array

45. Assignment 2
Example :-
Step 6 : Calculate square of Deviation and store in ‘D_sqr’ array
0 -2 3 -3 1 -1 2
0 1 2 3 4 5 6
D

46. Assignment 2
Example :-
Step 6 : Calculate square of Deviation and store in ‘D_sqr’ array
0 -2 3 -3 1 -1 2
0 1 2 3 4 5 6
D
i

47. Assignment 2
Example :-
Step 6 : Calculate square of Deviation and store in ‘D_sqr’ array
D_sqr[0] = (0) * (0)
0 -2 3 -3 1 -1 2
0 1 2 3 4 5 6
D
i

48. Assignment 2
Example :-
Step 6 : Calculate square of Deviation and store in ‘D_sqr’ array
D_sqr[0] = (0) * (0)
D_sqr[0] = 0
0 -2 3 -3 1 -1 2
0 1 2 3 4 5 6
D
i

49. Assignment 2
Example :-
Step 6 : Calculate square of Deviation and store in ‘D_sqr’ array
D_sqr[0] = (0) * (0)
D_sqr[0] = 0
0 -2 3 -3 1 -1 2
D_sqr
0 1 2 3 4 5 6
0
D
i

50. Assignment 2
Example :-
Step 6 : Calculate square of Deviation and store in ‘D_sqr’ array
0 -2 3 -3 1 -1 2
0 1 2 3 4 5 6
0
D
i
D_sqr

51. Assignment 2
Example :-
Step 6 : Calculate square of Deviation and store in ‘D_sqr’ array
D_sqr[1] = (-2) * (-2)
D_sqr[1] = 4
0 -2 3 -3 1 -1 2
0 1 2 3 4 5 6
0
D
i
D_sqr

52. Assignment 2
Example :-
Step 6 : Calculate square of Deviation and store in ‘D_sqr’ array
D_sqr[1] = (-2) * (-2)
D_sqr[1] = 4
0 -2 3 -3 1 -1 2
0 1 2 3 4 5 6
0 4
D
i
D_sqr

53. Assignment 2
Example :-
Step 6 : Calculate square of Deviation and store in ‘D_sqr’ array
0 -2 3 -3 1 -1 2
0 1 2 3 4 5 6
0 4
D
i
D_sqr

54. Assignment 2
Example :-
Step 6 : Calculate square of Deviation and store in ‘D_sqr’ array
D_sqr[2] = (3) * (3)
D_sqr[2] = 9
0 -2 3 -3 1 -1 2
0 1 2 3 4 5 6
0 4
D
i
D_sqr

55. Assignment 2
Example :-
Step 6 : Calculate square of Deviation and store in ‘D_sqr’ array
D_sqr[2] = (3) * (3)
D_sqr[2] = 9
0 -2 3 -3 1 -1 2
0 1 2 3 4 5 6
0 4 9
D
i
D_sqr

56. Assignment 2
Example :-
Step 6 : Calculate square of Deviation and store in ‘D_sqr’ array
0 -2 3 -3 1 -1 2
0 1 2 3 4 5 6
0 4 9
D
i
D_sqr

57. Assignment 2
Example :-
Step 6 : Calculate square of Deviation and store in ‘D_sqr’ array
D_sqr[3] = (-3) * (-3)
D_sqr[3] = 9
0 -2 3 -3 1 -1 2
0 1 2 3 4 5 6
0 4 9
D
i
D_sqr

58. Assignment 2
Example :-
Step 6 : Calculate square of Deviation and store in ‘D_sqr’ array
D_sqr[3] = (-3) * (-3)
D_sqr[3] = 9
0 -2 3 -3 1 -1 2
0 1 2 3 4 5 6
0 4 9 9
D
i
D_sqr

59. Assignment 2
Example :-
Step 6 : Calculate square of Deviation and store in ‘D_sqr’ array
0 -2 3 -3 1 -1 2
0 1 2 3 4 5 6
0 4 9 9
D
i
D_sqr

60. Assignment 2
Example :-
Step 6 : Calculate square of Deviation and store in ‘D_sqr’ array
D_sqr[4] = (1) * (1)
D_sqr[4] = 1
0 -2 3 -3 1 -1 2
0 1 2 3 4 5 6
0 4 9 9
D
i
D_sqr

61. Assignment 2
Example :-
Step 6 : Calculate square of Deviation and store in ‘D_sqr’ array
D_sqr[4] = (1) * (1)
D_sqr[4] = 1
0 -2 3 -3 1 -1 2
0 1 2 3 4 5 6
0 4 9 9 1
D
i
D_sqr

62. Assignment 2
Example :-
Step 6 : Calculate square of Deviation and store in ‘D_sqr’ array
0 -2 3 -3 1 -1 2
0 1 2 3 4 5 6
0 4 9 9 1
D
i
D_sqr

63. Assignment 2
Example :-
Step 6 : Calculate square of Deviation and store in ‘D_sqr’ array
D_sqr[5] = (-1) * (-1)
D_sqr[5] = 1
0 -2 3 -3 1 -1 2
0 1 2 3 4 5 6
0 4 9 9 1
D
i
D_sqr

64. Assignment 2
Example :-
Step 6 : Calculate square of Deviation and store in ‘D_sqr’ array
D_sqr[5] = (-1) * (-1)
D_sqr[5] = 1
0 -2 3 -3 1 -1 2
0 1 2 3 4 5 6
0 4 9 9 1 1
D
i
D_sqr

65. Assignment 2
Example :-
Step 6 : Calculate square of Deviation and store in ‘D_sqr’ array
0 -2 3 -3 1 -1 2
0 1 2 3 4 5 6
0 4 9 9 1 1
D
i
D_sqr

66. Assignment 2
Example :-
Step 6 : Calculate square of Deviation and store in ‘D_sqr’ array
D_sqr[6] = (2) * (2)
D_sqr[6] = 4
0 -2 3 -3 1 -1 2
0 1 2 3 4 5 6
0 4 9 9 1 1
D
i
D_sqr

67. Assignment 2
Example :-
Step 6 : Calculate square of Deviation and store in ‘D_sqr’ array
D_sqr[6] = (2) * (2)
D_sqr[6] = 4
0 -2 3 -3 1 -1 2
0 1 2 3 4 5 6
0 4 9 9 1 1 4
D
i
D_sqr

68. Assignment 2
Example :-
Step 7 : Calculate Mean for square of the Deviation ‘D_sqr’ array

69. Assignment 2
Example :-
Step 7 : Calculate Mean for square of the Deviation ‘D_sqr’ array
0 4 9 9 1 1 4
0 1 2 3 4 5 6
D_sqr

70. Assignment 2
Example :-
Step 7 : Calculate Mean for square of the Deviation ‘D_sqr’ array
Variance = sum of all elements in ‘D_sqr’ / size
0 4 9 9 1 1 4
0 1 2 3 4 5 6
D_sqr

71. Assignment 2
Example :-
Step 7 : Calculate Mean for square of the Deviation ‘D_sqr’ array
Variance = sum of all elements in ‘D_sqr’ / size
Variance = 28 / 7
0 4 9 9 1 1 4
0 1 2 3 4 5 6
D_sqr

72. Assignment 2
Example :-
Step 7 : Calculate Mean for square of the Deviation ‘D_sqr’ array
Variance = sum of all elements in ‘D_sqr’ / size
Variance = 28 / 7
Variance = 4.000000
0 4 9 9 1 1 4
0 1 2 3 4 5 6
D_sqr

73. Assignment 2
Example :-
Step 8 : Print the variance

74. Assignment 2
Example :-
Step 8 : Print the variance
Variance = 4.000000

75. Sample execution:-
Assignment 2

76. Sample execution:-
Assignment 2

77. Assignment 2
Pre-requisites:-

78. Assignment 2
Pre-requisites:-
Functions

79. Assignment 2
Pre-requisites:-
Functions
Pointers

80. Assignment 2
Pre-requisites:-
Functions
Pointers
Dynamic memory allocation

81. Assignment 2
Pre-requisites:-
Functions
Pointers
Dynamic memory allocation
Objective:-

82. Assignment 2
Pre-requisites:-
Functions
Pointers
Dynamic memory allocation
Objective:-
To understand the concept of functions , pointers and dynamic
memory allocation.

83. Team Emertxe
Thank you