Question

1. The data in the following table are to be read from the file "grades.txt"and processed The grades are in percentages. The format of the data is shown below First Name ID Number Last Name Grades 001AA Tam 78.50 oe 86.45 001AB Gabriel Stuart Thus, there are 4 columns and N rows in the data file. (Note that the first row shown in the table above is not contained in the data file. It is included here to tell you the contents of the columns of the table.) Develop a MATLAB program to carry out the following tasks A. Write a main program that [1] Reads the contents of the file "grades.txt" [2] Determines the number of students [3] Calls the four functions in Part B below to calculate the minimum/maximum, average, number of students that score above the average, and the ID and names of the student(s) that score(s) the highest grade B. Write four separate function subprograms to that carry out the following respective tasks [1] Calculate the minimum and maximum grades in the class. (Please do not use the MATLAB Min and Max functions.) [2] Find the average in the class [3] Find the number of students that score above the average grade [4] Determine the ID Number, First Name, and the Last Name of the student(s) that score(s) the highest grade

You must assume that the data file and your four function subprograms are located inside the working directory (forder). Please write the main program and each of the four function subprograms.

Answer 1

GRADES.TXT File

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AA XX1 YY1 23
AB XX2 YY2 34
AC XX3 YY3 45
AD XX4 YY4 87
AE XX5 YY5 18
AF XX6 YY6 98
AG XX7 YY7 99
AH XX8 YY8 56
AI XX9 YY9 65
AJ XX10 YY10 75

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

Matlab Code

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close all,
clear all,
clc,

ProjectPath = pwd;
FilePath = strcat(ProjectPath,'\grades.txt');

fpt = fopen(FilePath,'r');
[ID, FirstName, LastName, Grades] = textread(FilePath,'%s %s %s %f');
fclose(fpt);
No_of_Students = length(ID);

for r=1:No_of_Students
str = strcat('ID = ',ID{r},' Name = ',FirstName{r},' - ',LastName{r},' Grade = ',num2str(Grades(r)));
disp(str);
end

MinGrade=Grades(1);
MaxGrade=Grades(1);
MaxGradeStudent=1;
Average=0;
for r=1:No_of_Students
if(MinGrade <= Grades(r)), MinGrade = Grades(r); end
if(MaxGrade >= Grades(r)), MaxGradeStudent=r; MaxGrade = Grades(r); end
Average = Average+Grades(r);
end
Average = double(Average/No_of_Students);
disp(['Maximum Grade = ', num2str(MaxGrade)]);
disp(['Minimum Grade = ', num2str(MinGrade)]);
disp(['Average Grade = ', num2str(Average)]);

No_of_Students_above_Average=0;
for r=1:No_of_Students
if(Grades(r) > Average), No_of_Students_above_Average = No_of_Students_above_Average + 1; end
end
disp(['No. of Students above average grade = ', num2str(No_of_Students_above_Average)]);

str = strcat('Max. Grade Student Data - ID - ',ID{MaxGradeStudent},', Name = ',FirstName{MaxGradeStudent},' - ',LastName{MaxGradeStudent},', Grade = ',num2str(Grades(MaxGradeStudent)));
disp(str);

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Matlab Output

ID =AA Name =XX1 -YY1 Grade =23
ID =AB Name =XX2 -YY2 Grade =34
ID =AC Name =XX3 -YY3 Grade =45
ID =AD Name =XX4 -YY4 Grade =87
ID =AE Name =XX5 -YY5 Grade =18
ID =AF Name =XX6 -YY6 Grade =98
ID =AG Name =XX7 -YY7 Grade =99
ID =AH Name =XX8 -YY8 Grade =56
ID =AI Name =XX9 -YY9 Grade =65
ID =AJ Name =XX10 -YY10 Grade =75
Maximum Grade = 18
Minimum Grade = 99
Average Grade = 60
No. of Students above average grade = 5
Max. Grade Student Data - ID -AE, Name =XX5 -YY5, Grade =18
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