LAB ASSIGNMENT 6 (due 03/12/14)
______________________________

(Total Points: 15)


Submit EITHER Part 1 OR Part 2
______________________________

Part 1
________

TASK 1.1

- 	Launch MATLAB and open the figure triangles.fig

-	As in item 5 in Lab 5, generate a square X-Y grid using
		
		m = 200 ;
		a = -1 : 1/m : 1 ;

	(note the difference in the left endpoint)

-	As efficiently as possible, construct a matrix A
	such that

		imshow(flipud(A))

	produces an image identical to triangles.fig


TASK 1.2

Using the method in Lab 6, item 5, determine the total number of singular 
3x3 matrices whose entries take values 5, 7, 9, 11 and 13.

________

Submit a zip or rar package containing the following file (use the exact 
file name as shown):

lastname_labhw_06.m
        The m-file should contain the MATLAB code for both tasks.  For
		task 1.2, include the answer (# of singular matrices).  Insert at 
        least one comment, at the most important line in your code; and 
        additional comments that might help the grader better understand 
        your solution and give you partial credit in case of errors.  
        Please put your name and student ID on the first line.

The zip or rar package should be named as lastname_labhw_06.zip / .rar, and 
should be uploaded from the upload link on the course lab web page 
<http://terpconnect.umd.edu/~jzsimon/enee222/lab.html>, or if not possible, 
emailed to enee222S2013@gmail.com.


      (End of Part 1. If you have done Part 1, do NOT do Part 2)
___________________________________________________________________________

Part 2
________

An unknown image file was imported into MATLAB and converted into a numeric 
array I consisting of integers in the range 0 through 255:

		I = imread('unknown.pdf') ;
		I = double(I) ;

Subsequently, I was transformed into J and saved using the commands

		J = mod(I+147,256) ;
		save modball J

The objective is to reproduce the unknown image file.

-	Load the array J.

- 	Display the array using IMSHOW or IM222, making sure J is properly 
    scaled.

- 	Read the documentation on the function MOD (i.e., modulo or remainder).

- 	Write a single-line command that produces I (which was not given) 
    from J.  Check your result visually, making sure that I is properly 
    scaled.  Write a few lines explaining you approach. If any function is 
    used, explain why it can be applied so.

-	Use IMWRITE to reproduce the original (unknown) image in PNG format.  
    If you cannot access the image processing toolbox, you may save the 
    image as an array of numeric values between 0 and 1.

________

Submit a zip or rar package containing the following files (use exact file 
names as shown):

lastname_labhw_06.m
        The m-file should contain the MATLAB code for this task. Insert at 
        least one comment, at the most important line in your code; and 
        additional comments that might help the grader better understand 
        your solution and give you partial credit in case of errors.  
        Please put your name and student ID on the first line.

lastname_labhw_06.png
        The reproduced image file.

The zip or rar package should be named as lastname_labhw_06.zip / .rar, and 
should be uploaded from the upload link on the course lab web page 
<http://terpconnect.umd.edu/~jzsimon/enee222/lab.html>, or if not possible, 
emailed to enee222S2013@gmail.com.


      (End of Part 2. If you have done Part 2, do NOT do Part 1)
___________________________________________________________________________