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How much for this code of javaLabB_EECS1021_Matrix_StudentVersion_W2023_v1 EECS	1021	–	Lab	B:	Matrix	 Student		(v1)	 2023	 /Users/drsmith/Documents/EECS_F2022_W23/eecs1021/labs/LabB/LabB_EECS1021_Matrix_StudentVersion_W2023_v1.docx	 Not	for	distribution.		Only	for	students,	TAs	and/or	professors	involved	in	EECS	1021	at	York	University.		Do	not	distribute	further	(e.g.	to	Course	Hero,	Chegg,	etc.).	 EECS	1021	–	Lab	B:	Matrix	 	 	 Dr.	James	Andrew	Smith,	P.Eng.	and	Richard	Robison	 	 	 This	lab	takes	place	in	the	third	week	of	school.			 	 Summary:	Practice	loops,	strings,	methods,	arrays	and	helpful	methods	that	Java	provides.	 	 Pre-Lab:	There	are	interactive	“Lab	B”	activities	on	eClass	that	are	due	on	the	Sunday	night	before	Lab	B.		 Make	sure	to	do	them	on	time.		View	the	two	“walk-through”	videos	on	Lab	B,	too.		They’ll	help	you.	 	   	 Figure	1	The	work	you	need	to	do	for	Lab	B.		VPL	is	due	on	Sunday	before	your	lab.  Introduction	 	 Matrices	and	arrays	are	key	concepts	in	all	branches	of	engineering.		It’s	why	you	take	courses	like	MATH	 1025	(“Applied	Linear	Algebra”).		It’s	also	why	we	teach	you	how	to	use	Matlab	in	1st	semester.		Here	 we’re	going	to	show	you	that	you	can	work	with	matrices	in	Java	using	objects	like	arrays.	 	 Due	dates.			 1. Pre-Lab:	All	of	the	interactive	pre-lab	activities	are	due	on	the	Sunday	night	before	your	lab.		 (11:55pm,	on	eClass)	 2. Lab	Demo:	If	you	choose	to	do	the	“live”	demo,	 then	it’s	due	during	your	scheduled	lab	session,	 either	in-person	or	via	Zoom.		Otherwise,	hand	it	 in	to	eClass	as	a	one	minute	(or	less)	video	by	the	 Sunday	night	(11:55pm,	on	eClass)	after	your	lab.		 3. Lab	Report:	computer-drawn	copy	of	the	flow	 chart	for	the	main	lab	demo.	 	 	 	 Figure	2	this	figure	shows	how	your	program	in	the	Lab	 Demo	should	operate.	You're	basically	performing	a	 math	operation	on	two	matrices.		Video:	 https://youtu.be/io6xVunGi1Y	 EECS	1021	–	Lab	B:	Matrix	 Student		(v1)	 2023	 /Users/drsmith/Documents/EECS_F2022_W23/eecs1021/labs/LabB/LabB_EECS1021_Matrix_StudentVersion_W2023_v1.docx	 Not	for	distribution.		Only	for	students,	TAs	and/or	professors	involved	in	EECS	1021	at	York	University.		Do	not	distribute	further	(e.g.	to	Course	Hero,	Chegg,	etc.).	 	 Marking	Guide:		 	 • All	interactive	Pre-lab	activities	are	graded	out	of	1	and	count	towards	your	“interactive”	activity	 grade.		Any	other	pre-lab	activity	is	not	graded.	 	 • The	lab	demo	is	out	of	0.8	and	counts	towards	your	lab	grade:		 o 0.2	to	parse	strings	of	values,		 o 0.2	to	perform	one	of	three	math	operations	on	two	2D	matrices,		 o 0.2	to	display	the	contents	of	the	resulting	2D	integer	matrix	and,	 o 0.2	to	demonstrate	all	these	tasks	in	a	coherent	fashion	in	one	program.	 	 • The	post-lab	flowchart	counts	for	0.2	points.	 EECS	1021	–	Lab	B:	Matrix	 Student		(v1)	 2023	 /Users/drsmith/Documents/EECS_F2022_W23/eecs1021/labs/LabB/LabB_EECS1021_Matrix_StudentVersion_W2023_v1.docx	 Not	for	distribution.		Only	for	students,	TAs	and/or	professors	involved	in	EECS	1021	at	York	University.		Do	not	distribute	further	(e.g.	to	Course	Hero,	Chegg,	etc.).	 Lab Background  	 This	lab	introduces	several	basic	concepts	of	programming,	such	as	using	arrays,	switch	expressions,	and	I/O.	 	 You	will	be	creating	a	program	that	applies	various	operations	to	two	matrices	of	numbers.	 	 Arrays  	 An	array	is	a	collection	of	values	of	the	same	type.	For	example,	var x = new int[]{1, 2, 3};	creates	an	array	of	three	 integers.	 	 Technically	speaking,	an	array	is	a	contiguous	block	of	memory.	Arrays	can	either	be	created	with	fixed	values	like	the	 previous	example,	or	an	array	can	be	created	with	a	size	and	then	filled	later,	like	var x = new int[3]; 	 	 To	assign	a	value	(42	for	example)	to	the	element	of	the	array	(a	for	example)	at	some	index	i,	you	would	write	a[i] =  42;	 	 Arrays	can	be	multidimensional.	For	example,	var x = new int[2][3];	creates	a	two-dimensional	array	of	three	integers	 (aka	a	2x3	matrix).	 	 Note	that	unlike	some	modern	OOP	languages	such	as	Kotlin	or	Swift,	arrays	are	not	objects.	They	are	just	a	collection	of	 values.	 	 Switch Expressions  	 Switch	Expressions	are	a	way	to	write	a	switch	statement	in	a	more	concise	way.	They	are	relatively	new	to	Java,	but	 exist	in	many	other	languages.	 	 Suppose	you	have	the	following	switch	expression:	 	 class Example {      static void exampleSwitch() {          var a = 1; // or any number          var x = switch (a) {              case 1 -> "one";              case 2 -> "two";              case 3 -> "three";              default -> "other";          };          // x is now "one"      }  }  	 	 In	this	case,	the	value	of	x	is	dependent	on	the	value	of	a	.		That	is,		if	a == 1,	then	x = "one",	and	similarly	for	the	other	 cases.	 	 Since	the	number	of	possible	values	is	infinite	(i.e.,	it’s	the	set	of	all	possible	integers),	a	default	case	is	required	in	case	 a	is	not	one	of	the	values	in	the	switch	expression.	 	 So,	if	a == 4,	then	x = "other".	 	 	   EECS	1021	–	Lab	B:	Matrix	 Student		(v1)	 2023	 /Users/drsmith/Documents/EECS_F2022_W23/eecs1021/labs/LabB/LabB_EECS1021_Matrix_StudentVersion_W2023_v1.docx	 Not	for	distribution.		Only	for	students,	TAs	and/or	professors	involved	in	EECS	1021	at	York	University.		Do	not	distribute	further	(e.g.	to	Course	Hero,	Chegg,	etc.).	 Pre-Lab  There	are	four	tasks	you	should	do	before	starting	the	lab,	all	within	the	 Prelab	Java	class.		 	 • Task	1:	add	elements	together	from	two	different	arrays	and	print	 out	the	results.	 o Reference:	Sharan	Kishori:	https://bit.ly/31Csrhk		 § Array:	Chapter	15		 § length:	pg.	125	in	Ch	4	 § println:		multiple	examples		 • Task	2:	read	number	input	from	the	user	and	sum	up	all	those	 numbers,	after	converting	from	string	to	integer.	 o Reference:	Sharan	Kishori:	https://bit.ly/31Csrhk		 § For	loops:	Chapter	5	of	https://bit.ly/31Csrhk		 § parseInt():	pg	321	(Ch	8)	of	https://bit.ly/31Csrhk	 o Reference:	external	websites:	 § Scanner:	 • 	https://www.javatpoint.com/post/java-scanner-next-method		 • https://docs.oracle.com/javase/8/docs/api/java/util/Scanner.html		 • Task	3:	assign	a	numeric	value	to	a	variable	based	on	a	character	value	in	another	variable.	 o External	websites:	 § Modern	switch-case:	https://www.wearedevelopers.com/magazine/modern-java-switch-expressions		 o Reference:	Sharan	Kishori:	https://bit.ly/31Csrhk		 § Ch	5:	old	way	of	doing	switch-case		 § Ch.	9	&	pg	403:	Exceptions	(IllegalArgumentException())	 • Task	4:	fill	up	a	matrix	(array)	with	values	using	a	loop.	 o Reference:	Sharan	Kishori:	https://bit.ly/31Csrhk		 § For	loops:	Chapter	5		 § length:	pg.	125	in	Ch	4	 § println:		multiple	examples		 package eecs1021;    import java.util.Scanner;    public class Prelab {      public static void main(String[] args) {          var array = new int[]{1, 2, 3, 4, 5, 6, 7, 8, 9, 10};          var array2 = new int[]{10, 9, 8, 7, 6, 5, 4, 3, 2, 1};            // 1. Iterate through the arrays, summing their corresponding values together and then printing the result.          //    The output should be "11 11 11 11 11 11 11 11 11 11"              // 2. Read a line of input using `sc`. The line should be five space-separated integers. Then, print the sum of the integers.            var sc = new Scanner(System.in);            // 3. Using a switch expression, assign the value of a variable `x` based on these cases:          //    - If `flag` is `A`, set `x` to `1`          //    - If `flag` is `B`, set `x` to `2`          //    - If `flag` is `C`, set `x` to `3`          //    - otherwise, throw some Exception;          //          //   Then, print `x`            char flag = 'A';            // 4. Fill up the matrix `mat` with the following values using a for loop: `0, 2, 4, 6, 8`            var mat = new int[5];        }  }  Template for the pre-lab.  Watch the video for a walk-through and try it yourself.  	 Figure	3	Walk-through	of	the	pre-lab	on	YouTube:	 https://youtu.be/bAIPDbgz8GU	 EECS	1021	–	Lab	B:	Matrix	 Student		(v1)	 2023	 /Users/drsmith/Documents/EECS_F2022_W23/eecs1021/labs/LabB/LabB_EECS1021_Matrix_StudentVersion_W2023_v1.docx	 Not	for	distribution.		Only	for	students,	TAs	and/or	professors	involved	in	EECS	1021	at	York	University.		Do	not	distribute	further	(e.g.	to	Course	Hero,	Chegg,	etc.).	 	 Main Lab  	 Specification  	 In	the	first	part	of	the	program,	read	the	data	from	the	 console	input:	 	 1. The	program	should	print	"Enter the first matrix  values: "	and	then	read	the	following	line	from	the	 input.	The	input	should	be	a	string	of	numbers	 separated	by	spaces.	The	amount	of	numbers	 should	be	the	number	of	values	in	the	matrix	(in	 this	case,	DIMENSION * DIMENSION)	 2. Repeat	Step	1	for	the	second	matrix	values	 3. The	program	should	print	"Enter the desired  operation: "	and	then	read	the	following	line	from	 the	input.	The	input	should	be	one	of:	*,	+,	or	-.	 4. The	resulting	matrix	from	applying	the	operation	 should	then	be	printed	in	the	following	format:	 	 [a0, a1, a2, ..., aN]  [b0, b1, b2, ..., bN]  ...  [c0, c1, c2, ..., cN]	  	 The	whole	thing	is	visualized	on	the	right,	in	a	flowchart.1			       	   	 1	Flowcharting:	see	pgs	10	-	12	in	JAVA	Programming	for	Engineers:	https://bit.ly/3na8Ts6		 	 Figure	4	Flowchart	view	of	the	program.	 EECS	1021	–	Lab	B:	Matrix	 Student		(v1)	 2023	 /Users/drsmith/Documents/EECS_F2022_W23/eecs1021/labs/LabB/LabB_EECS1021_Matrix_StudentVersion_W2023_v1.docx	 Not	for	distribution.		Only	for	students,	TAs	and/or	professors	involved	in	EECS	1021	at	York	University.		Do	not	distribute	further	(e.g.	to	Course	Hero,	Chegg,	etc.).	   Procedure for the main part of the lab  	 In	the	‘main’	method,		 	 1. Create	a	new	‘Scanner’	object	 2. Print	the	prompt	as	per	the	specification	and	read	the	 inputs	 	 Next,	define	a	function	with	the	signature	private static int[][]  parseMatrix(String s, int rowCount, int colCount)	 	 1. This	function	should	split	the	input	string	s	by	" ";	 2. For	each	element	in	the	split	string,	convert	it	to	an	integer	and	store	it	in	the	corresponding	element	of	the	 matrix	 3. Return	the	matrix	 	 Then,	define	a	function	with	the	signature	private static int[][] computeMatrixExpression(int[][] a, int[][]  b, String op) 	 	 1. Iterate	over	all	elements	in	the	matrices	 2. For	each	element,	use	a	switch	expression	to	assign	the	result	of	the	operation	to	the	corresponding	 element	of	the	result	matrix	 3. For	the	`default`	case,	throw	an	IllegalArgumentException	 	 Then,	define	a	function	with	the	signature	private static String matrixToString(int[][] mat)	 	 1. Create	an	instance	of	StringJoiner	using	
	as	the	delimiter	 2. Iterate	over	all	rows	in	the	matrix,	and	use	Arrays#toString	and	add	the	string	to	the	StringJoiner	 3. Return	the	string	from	the	StringJoiner	 	 Use	all	of	these	functions	in	the	`main`	method:	 1. After	having	received	all	the	input,	call	the	parseMatrix	function	to	parse	the	matrices.	 2. Then,	use	the	computeMatrixExpression	function	and	store	the	result.	 3. Finally,	convert	the	matrix	to	a	string	and	print	it.	 	   	 Your	main	method	should	use	these	three	methods.		Inputs	and	outputs	are	shown,	too.	You’ll	need	to	create	them.	 	 Demo	the	working	program	to	the	TA.	 Figure	5	Walk-through	of	important	topics	for	the	main	 part	of	the	lab:	https://youtu.be/XPgW4x8Ep20		 EECS	1021	–	Lab	B:	Matrix	 Student		(v1)	 2023	 /Users/drsmith/Documents/EECS_F2022_W23/eecs1021/labs/LabB/LabB_EECS1021_Matrix_StudentVersion_W2023_v1.docx	 Not	for	distribution.		Only	for	students,	TAs	and/or	professors	involved	in	EECS	1021	at	York	University.		Do	not	distribute	further	(e.g.	to	Course	Hero,	Chegg,	etc.).	 	     Lab Report:  	 Submit	an	annotated	flowchart	that	shows	the	connection	between	your	flowchart	and	your	code.	 	 It	should	look	similar	to	this:	 	 	 But	the	flowchart	should	more	cleanly	drawn,	It	should	NOT	look	hand-sketched.			 Use	a	program	like	Google	Slides,	Microsoft	PowerPoint,	etc.	 	 Hand	this	in	by	the	Sunday	after	your	lab	 	 	   EECS	1021	–	Lab	B:	Matrix	 Student		(v1)	 2023	 /Users/drsmith/Documents/EECS_F2022_W23/eecs1021/labs/LabB/LabB_EECS1021_Matrix_StudentVersion_W2023_v1.docx	 Not	for	distribution.		Only	for	students,	TAs	and/or	professors	involved	in	EECS	1021	at	York	University.		Do	not	distribute	further	(e.g.	to	Course	Hero,	Chegg,	etc.).	 Appendix  	 Pre-lab	Template	(Fill	it	in)	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 package eecs1021;    import java.util.Scanner;    public class Prelab {      public static void main(String[] args) {          var array = new int[]{1, 2, 3, 4, 5, 6, 7, 8, 9, 10};          var array2 = new int[]{10, 9, 8, 7, 6, 5, 4, 3, 2, 1};            // 1. Iterate through the arrays, summing their corresponding values together and then printing the result.          //    The output should be "11 11 11 11 11 11 11 11 11 11"              // 2. Read a line of input using `sc`. The line should be five space-separated integers. Then, print the sum of the integers.            var sc = new Scanner(System.in);            // 3. Using a switch expression, assign the value of a variable `x` based on these cases:          //    - If `flag` is `A`, set `x` to `1`          //    - If `flag` is `B`, set `x` to `2`          //    - If `flag` is `C`, set `x` to `3`          //    - otherwise, throw some Exception;          //          //   Then, print `x`            char flag = 'A';            // 4. Fill up the matrix `mat` with the following values using a for loop: `0, 2, 4, 6, 8`            var mat = new int[5];        }  }  EECS	1021	–	Lab	B:	Matrix	 Student		(v1)	 2023	 /Users/drsmith/Documents/EECS_F2022_W23/eecs1021/labs/LabB/LabB_EECS1021_Matrix_StudentVersion_W2023_v1.docx	 Not	for	distribution.		Only	for	students,	TAs	and/or	professors	involved	in	EECS	1021	at	York	University.		Do	not	distribute	further	(e.g.	to	Course	Hero,	Chegg,	etc.).	 	 Lab	Template	–	Main	Task	(Fill	it	in)	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 package eecs1021;    import java.util.Arrays;  import java.util.Objects;  import java.util.Scanner;  import java.util.StringJoiner;    public class Main {      private static final int DIMENSION = 3;  /* aim for 3 x 3 matrix: 3 rows and 3 columns */         /**       * Parses a matrix from a string.       * @param s The string to parse. It must consist only of numbers separated by spaces.        * The amount of numbers should be equal to {@code rowCount * columnCount}.       * @param rowCount the number of rows in the matrix.       * @param colCount the number of columns in the matrix.       * @return The matrix represented by the string.       */      private static int[][] parseMatrix(String s, int rowCount, int colCount) {           /* fill in here */            return null;  /* change this! return a 2D int[][] variable*/      }        /**       * Returns the matrix which is the result of the operation {@code op} on the        * matrices {@code a} and {@code b}.       * @param a The first matrix.       * @param b The second matrix.       * @param op The operation to perform. Must be one of {@code +}, {@code -}, {@code *}.       * @return The matrix which is the result of the operation.       */      private static int[][] computeMatrixExpression(int[][] a, int[][] b, String op) {           /* fill in here */            return null; /* change this! return a 2D int[][] variable*/        }        /**       * Converts a matrix to a string. For a given matrix        * {@code [[1, 2, 3], [4, 5, 6], [7, 8, 9]]}, the string representation will be        * {@code "[1 2 3]
[4 5 6]
[7 8 9]"}.       *       * @param mat The matrix to convert.       * @return The string representation of the matrix.       */      private static String matrixToString(int[][] mat) {           /* fill in here */            return null; /* change this! return a String */      }    /* main method.  */      public static void main(String[] args) {           /* fill in here.  Use the flow chart to lay out your plan! */        }  }

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