University:
Georgia Southern University
Course:
ENGR1121 | Computing in Mechanical Engineering
Academic year:

2024
Views:

210

Pages:

1
Author:

Jalen W.

ENGR1121 – Computing Applications in Mechanical Engineering Lab 1D Arrays II: Vector Arithmetic, Vector Indexing and Logic Expressions 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 1. (5 points) Write a MATLAB program that will determine the minimum, maximum, and mean (average) score of a set of exam scores. Use the array scores = [78, 57, 82, 91, 81, 84, 73, 68, 24, 88], to test your program. MATLAB has built in sum, mean, min, and max functions for arrays. Modify your program so that the average is computed ignoring the lowest and highest scores, i.e., throw out the low and high score and then compute the average of the remaining scores. 2. (5 points) Write a MATLAB program that: a. Creates an array named ww with the values 78, 65, -5, 53, 88, -1, 90, and 0. b. Determines the Booleans bww that show 1s and 0s where the elements in ww are less than zero. c. Determines the indices of the elements in ww that have values less than zero. Name this vector indww. d. Replaces the values of the elements that are less than zero in ww with value zero. The other elements of ww should be left unchanged. e. Determine the indices of the elements in ww that have values greater than or equal to 70 and less than 90. You will need to use a compound comparison operation, i.e. (test1) & (test2). 3. (10 points) The maximum daily temperature (in F) for New York City and Anchorage, Alaska during the month of January 2001 are given (data from the U.S. National Oceanic Atmospheric Administration). Load the data by downloading the data file from Folio and using the command load filename in your program. Write a MATLAB program to answer the following: a. Calculate the average temperature for the month in each city. b. How many days was the temperature below the average in each city? c. How many days, and which dates in the month, was the temperature in Anchorage higher than the temperature in New York? d. How many days, and which dates in the month, was the temperature the same in both cities? e. How many days, and which dates in the month, was the temperature in both cities above freezing (above 32 F)? f. Display all the above outputs using relevant descriptive texts. 1 Instructor: Dr. Priya Goeser