Introduction to MATLAB 7 for Engineers - The University of Jordan

More documents

Recommendations

Info

Lecture 6 Computer Applications 0933201 Chapter 4A simple example of a while loop isx = 5;k = 0;while x < 25k = k + 1;y(k) = 3*x;x = 2*x-1;endThe loop variable x is initially assigned the value 5,and it keeps this value until the statement x = 2*x - 1is encountered the first time. Its value then changes to9. Before each pass through the loop, x is checked tosee if its value is less than 25. If so, the pass is made.If not, the loop is skipped.4-30Another Example of a while LoopWrite a script file to determine how many terms arerequired for the sum of the series 5k 2 –2k, k = 1, 2, 3, …to exceed 10,000. What is the sum for this many terms?total = 0;k = 0;while total < 1e+4k = k + 1;total = 5*k^2 - 2*k + total;enddisp(’The number of terms is:’)disp(k)disp(’The sum is:’)disp(total)The sum is 10,203 after 18 terms.4-31Z.R.KZ.R.K30 31The switch StructureThe switch structure provides an alternative to using theif, elseif, and else commands. Anything programmedusing switch can also be programmed using if structures.However, for some applications the switch structure ismore readable than code using the if structure.switch input expression % which can be a scalar or stringcase value1statement group 1case value2statement group 2...otherwisestatement group nend4-32Z.R.K4-33The following switch block displays the pointon the compass that corresponds to that angle.switch anglecase 45disp(’Northeast’)case 135disp(’Northwest’)case 225disp(’Southwest’)case 315disp(’Southeast’)otherwisedisp(’Direction Unknown’)endZ.R.K33 More? See pages 225-227.The Editor/Debugger containing twoprograms to be analyzed. Figure 4.7–1Fourier Seriesx(t) ) = a 0 + n=1 ( a n cos n 0 t + b n sin n n 0 t )Evaluate the following function:x(t) ) = 0.5 + 2/ ( cost – 1/3 cos 3t + 1/5 cos5t– 1/7 cos7t + … ) for -10 < t < 10.By using different colors plot the following:1- The first two terms.2- On the same figure plot the first three terms.3- On the same figure plot the first four terms.4- On the same figure plot the first five terms.5- By using the general form of the function, and by using thefor or while or … loop. Set n as input variable, On thesame figure plot the first one-hundredterms.4-34 Z.R.KMore? See pages 228-234. 4-35Z.R.KZ.R.K. 2008 Page 6 of 7
Lecture 6 Computer Applications 0933201 Chapter 4End of Chapter 4Problems Page 241 - 257 !Solve: 2, 5, 11, 16, 23, 24, 25, 33.www.ju.edu.jo\zkhatibZ.R.J.KZ.R.J.K Z.R.KZ.R.K. 2008 Page 7 of 7
Page 2 and 3: Lecture 6 Computer Applications 093
Page 4: Instead, consider what happens if w

Introduction to MATLAB 7 for Engineers - The University of Jordan

Create successful ePaper yourself

Delete template?

Save as template?