Problem 44960. Rescale Scores

Created by Pooja Lalan

Solve Later

Each column (except last) of matrix X contains students' scores in a course assignment or a test. The last column has a weighted combination of scores across all the assignments and tests.

Replace the elements in the last column of this matrix with a GPA calculated based on the following scale:

 Score      GPA    
90 - 100   3 - 4      
80 - 90    2 - 3      
70 - 80    1 - 2      
60 - 70    0 - 1      
Below 60     0

Assume that no student in this class has scored below 60. Also note that the mapping in the range [60, 100] is linear.

See https://www.mathworks.com/help/matlab/ref/rescale.html

Example

Input:

   100  90  95  95
    70  50  60  60
    80  70  90  80

Output:

   100  90  95  3.5
    70  50  60  0.0
    80  70  90  2.0

Solve

Solution Stats

4374 Solutions
1014 Solvers

Last Solution submitted on Jul 13, 2020

Last 200 Solutions

Problem Comments

4 Comments

4 Comments

Show 1 older comment

Kingfall on 11 Nov 2019

It appears the last column of the output from the problem statement should be 3.5; 0.0; 2.0 instead of 3.5; 0.0; 3.0, but the first test suite does have it correct.

Ansgar Elles on 28 Mar 2020

yes true, thank you

Pooja Lalan on 30 Mar 2020

Thank you! Modified the problem statement.

Nayuan Lian on 30 Jun 2020 at 15:28

Why doesn't it work?
function X = rescale_scores(X)
X = [X(1:end,1:end-1) (X(1:end,end).-60)./4]
end

Solution Comments

Solution 2627062

1 Comment

1 Comment

Umur Ulas Harman on 29 Jun 2020 at 5:58

it is ridiculous but still, it works. feel free to improve it.

function X = rescale_scores(X)
t=zeros(size(X,1)+2,size(X,2));
adjustment=[60;100];
t(1:end-2,1:end)=X;
t(end-1:end,end)=adjustment;
initial_finals=rescale(t(:,end),0,4);
X(:,end)=initial_finals(1:end-2,:);

end

Solution 2585002

1 Comment

1 Comment

Piero Cimule on 19 Jun 2020 at 16:41

A= 60:0.1:100;
A_reescale= rescale(A,0,4);

for c=1:size(X,1);
for d=1:size(A,2);
if X(c,(size(X,2)))==A(d);
X(c,(size(X,2)))=A_reescale(d);
end
end
end

Solution 2232582

3 Comments

3 Comments

Saad on 24 Apr 2020

Please, what is wrong with the following answer
X = (X-60)/10;
thank u

SOUMYADEEP SENGUPTA on 25 Apr 2020

This would operate on the entire matrix X. However we want the GPA to appear only in the last column of X. So try by declaring another variable which would calculate the GPA and then replace the last column of X with this column vector.

Kanchan Gorde on 9 May 2020

We have to modify only last column of matrix X not an entire matrix so find GPA for that column only.

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