Introduction to Programming in MATLAB

1. Introduction to Programming in MATLAB Intro. MATLAB Peer Instruction Lecture Slides by Dr. Cynthia Lee, UCSD is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.Based on a work at www.peerinstruction4cs.org.

2. LOOPS: Examples

3. Fill in the blank in the following code to create an infinite loop. Do no not add or change code except adding one line of code on the blank line. • counter = inf; % MATLAB built-in value “inf” • counter = 1; • counter = counter – 1; • Other/none/more than one

4. Write a loop that counts how many pure blue ([0 255 0]) pixels are in an image. function [blues] = CountBluePixels(im) for row = for col = pix = im(row,col,:); end end end

5. How many times is “CSE 7” printed when this code runs? • 2 times • 3 times • 5 times • 12 times • Other/none/more than one

6. What is the value of alpha after this code runs? • 4 • 5 • 7 • 10 • Other/none/more than one

7. Write a loop that finds the average amount of red in an image. function [ave] = AverageRed(im) for row = for col = red = im(row,col,1); end end end

8. How many times does ‘hi’ print? row = 1; while row <= 2 for col = 1:10 display(‘hi’) row = row + 1; end row = row + 1; end • 0 • 2 • 10 • 20 • Keeps printing ‘hi’ forever in an infinite loop