Checker guidelines: for compatibility with the checker, the struct array must be calledstudents, and the names of the fields must beName,Credits, andMajor, with the first letter capitalized. The Name, Credits, and Major fields MUST BE COLUMN VECTORS, NOT ROW VECTORS.

The trickiest part is getting the letter grades into a column vector field. Try something like this:

students(sheet).Grades = [txtData{2:end, 2}]

Here's the function for reference:

function gpas = GPA(Student) %Declare the variables totalGrades=0; totCredits=0; totMajorGrades=0; totMajorCredits=0; %Use a for loop, to calculate the total credits, total grades, %total major grades, and total major credits for i=1:length(Student.Grades) %Check the student grade is equal to A if (Student.Grades(i)=='A') % calculate the total grades and credits totalGrades=totalGrades+4*Student.Credits(i); totCredits=totCredits+Student.Credits(i); if(Student.Major(i)) % calculate the total major grades and major credits totMajorGrades=totMajorGrades+4*Student.Credits(i); totMajorCredits=totMajorCredits+Student.Credits(i); end %Check the student grade is equal to B elseif (Student.Grades(i)=='B') % calculate the total grades and credits totalGrades=totalGrades+3*Student.Credits(i); totCredits=totCredits+Student.Credits(i); if(Student.Major(i)) % calculate the total major grades and major credits totMajorGrades=totMajorGrades+3*Student.Credits(i); totMajorCredits=totMajorCredits+Student.Credits(i); end %Check the student grade is equal to C elseif (Student.Grades(i)=='C') % calculate the total grades and credits totalGrades=totalGrades+2*Student.Credits(i); totCredits=totCredits+Student.Credits(i); if(Student.Major(i)) % calculate the total major grades and major credits totMajorGrades=totMajorGrades+2*Student.Credits(i); totMajorCredits=totMajorCredits+Student.Credits(i); end %Check the student grade is equal to D elseif (Student.Grades(i)=='D') % calculate the total grades and credits totalGrades=totalGrades+Student.Credits(i); totCredits=totCredits+Student.Credits(i); if(Student.Major(i)) % calculate the total major grades and major credits totMajorGrades=totMajorGrades+Student.Credits(i); totMajorCredits=totMajorCredits+Student.Credits(i); end %Check the student grade is equal to F elseif (Student.Grades(i)=='F') % calculate the total credits totCredits=totCredits+Student.Credits(i); if(Student.Major(i)) % calculate the total major credits totMajorCredits=totMajorCredits+Student.Credits(i); end end end

%calculate the gpas gpas=[totalGrades/totCredits totMajorGrades/totMajorCredits]; end