Question

Help on writing a MATLAB code.

Let's say i am given a .txt file and in that text file there are 26 rows that represent individual students grades and then 7 columns that represent specific homework assignments.

We want to ask the user to select a specific homework assignment and output the mean and standard deviation for that assignment.

Then we want to ask the user to select an individual student and output the mean and standard deviation for that student's grades.

Answer 1

solution.m

fileID = fopen('a.txt','r');
A = fscanf(fileID,'%f');
grades = vec2mat(A,7);
assignment = input('Enter homework assignment number from 1 to 7 :');
if assignment >=1 && assignment <=7
m = mean(grades(:,assignment));
sigma = std(grades(:,assignment));
fprintf('mean = %f ',m);
fprintf('std = %f ',sigma);
else
disp('please enter assigment b/w 1to 7');
end
student = input('Enter homework student number from 1 to 26 :');

if student >=1 && student <=26
m = mean(grades(student,:));
sigma = std(grades(student,:));
fprintf('mean = %f ',m);
fprintf('std = %f ',sigma);
else
disp('please enter student number b/w 1to 26');
end

a.txt

6 1 1 10 8 2 2
8 5 7 7 4 5 10
8 6 1 8 3 10 9
6 7 6 3 9 6 5
8 8 8 6 10 1 8
7 7 3 9 7 1 5
2 8 5 5 3 9 9
6 4 6 10 1 5 4
4 6 1 1 9 4 1
1 2 5 4 6 8 6
2 1 7 6 10 4 10
2 10 3 1 1 6 2
7 3 9 8 6 8 5
5 6 10 6 3 9 8
7 10 9 6 9 4 1
3 2 6 9 2 7 10
1 2 3 9 5 10 8
6 4 8 8 4 1 6
3 10 3 4 9 6 2
10 4 10 5 7 5 5
10 3 7 8 3 4 6
4 2 7 2 4 3 10
1 4 2 2 2 8 9
7 4 1 3 7 10 10
9 2 3 6 6 2 7
10 5 9 10 2 8 5