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Assignment 6

Notes:

• Include counts of compares and swaps in all trace tables for each row, and a total count when

done.

• Do all trace tables by hand (don't write programs to generate them – you will learn more).

Question 1

Do a trace table for selection sort for the following array of numbers: 15 12 16 13 11 14 10 17.

Do a trace table for selection sort for the following array of numbers: 10 11 12 13 14 15 16 17.

What does this say about best case performance of selection sort?

Do a trace table for selection sort for the following array of numbers: 17 16 15 14 13 12 11 10.

What does this say about worst case performance of selection sort?

Question 2

Do a trace table for insertion sort for the following array of numbers: 15 12 16 13 11 14 10 17.

Do a trace table for insertion sort for the following array of numbers: 10 11 12 13 14 15 16 17.

What does this say about best case performance of insertion sort?

Do a trace table for insertion sort for the following array of numbers: 17 16 15 14 13 12 11 10.

What does this say about worst case performance of insertion sort?

Question 3

In this question you will measure the performance of selection sort and insertion sort by plotting N against the average number of comparisons and swaps needed to sort a randomly generated array of N doubles.

Write (static) methods:

• boolean isSorted(double[] a) – returns true if and only if the array a is sorted.

• double[] random(int N) – returns an array of doubles of size N where each entry in the array is

a random double between 0 and 1 (use Math.random()).

• void selection(double[] a) – sorts the array a using selection sort.

• void insertion(double[] a) – sorts the array a using insertion sort.

Instrument your two sorting routines to count the number of compares and swaps each routine does.

Write a main method which, for various appropriate choices of N:

• generates 100 random arrays of size N, calls selection sort on each, checks that each array is

sorted, and outputs the average number of compares per call.

• generates 100 random arrays of size N, calls insertion sort on each, checks that each array is

sorted, and outputs the average number of compares per call.

• You main method should use your isSorted() method to check that each array is sorted after

you have run your sort method.

Do a plot (in Excel, OpenOffice, etc) of N against the number of compares (plot both sorts on the same plot), labeling the axis nicely, etc. Also plot N

Remark:

• Be careful not to sort on an already sorted array (doing so means you are measuring the

worst/best case, and not the average case).

• Strictly speaking you don't need to generate 100 arrays and average for selection sort since its

best case, worst case and average case all the same.

• Make sure your sorting and instrumentation code is correct before you start measuring the

 

counts and doing the plots!

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