Lab Functions - Notes

ENGR1121 – Computing Applications in Mechanical Engineering Lab Functions Lab due: end of lab Total points: 20 Labs are to be individual work. You may use MATLAB Marina, MATLAB’s help, and your notes. Lab work will be graded during lab time and working results must be shown to the lab instructor by the end of the scheduled lab time. All MATLAB programs and functions must be completed and submitted in accordance with the Computing Assignment Format and the MATLAB Coding Style. Submit an electronic copy of your lab work to the appropriate Dropbox Folder in GSU’s Folio by the end of lab. No hard copy needed unless specifically requested by the instructor. Grading Each problem will be graded according to: program design (identifying inputs/givens, process, and outputs; algorithm) and program style (program comments, variable names, proper formatted input and output including units) 25%, and program correctness 75%. Lab Work Problems 1-5: 3 points each 1. Write a function circle.m that consumes the radius r of a circle, calculates the circumference and area of the circle: c = 2πr and a = πr 2 , and gives the outputs as c and a. Write a test program that calls the function circle.m in order to calculate the circumference and area of a circle with radius 10 mm. 2. Write a function isodd.m that takes as input any integer N and returns a Boolean variable b: true or false (1 or 0) if N is odd or not respectively. 3. Write a function iseven.m that takes as input any integer N and returns a Boolean variable b: true or false (1 or 0) if N is even or not respectively. 4. Write a function swap.m that takes any two numbers x and y, swaps their values and returns the new, swapped x and y as outputs. 5. Write a MATLAB function letterGrade.m that takes a grade (scalar value between 0 and 100) and returns a letter grade (character A, B, C, D or F). 6. (5 points) Write a MATLAB function letterGrade.m that takes a 1D array of grades (values between 0 and 100) and returns a 1D array of letter grades (characters A, B, C, D or F) with the same dimensions as the array of grades. • You do not need to pre-allocate the 1D array for this problem. • Include error handling in your function such that if the user enters values that are not between 0 and 100, it gives an error or displays an appropriate message. • Test the function from the Command Window for a few such as simple cases: [55, 99 70], etc. 1 Instructor: Dr. Priya Goeser