Problem 44960 Rescale scores

The following code works fine with the first set of input tested however shows error for the second set. I am doing this on Cody. Could anyone tell me what's wrong?

function X = rescale_scores(X)
    A= 60:100;
    B= rescale(A,0,4);
    for c=1:40;
        for d=1:size(X,1);
        if X(d,length(X))==A(c);
    X(d,length(X))=B(c);
        end
        end
    end
    X
end

Answer 1

[Ameer Hamza]

This can be solved using a one-liner

function X = rescale_scores(X)
    X(:,end) = interp1([60 100], [0 4], X(:,end));
end

[Tavish Pattanayak]

Yeah it worked. Thanks!

However could you let me know what was the issue with the code I wrote?

[Ameer Hamza]

First, In your code, you used length(X) in

if X(d,length(X))==A(c);
    X(d,length(X))=B(c);
end

length() is not correct here. Either use size(X,2), or 'end'.

Also, you used

A = 60:100

which will only work if grades are integers. If they have a decimal part, then it will not equal to any element in A and therefore the condition

X(d,length(X))==A(c)

never becomes true.

[Tavish Pattanayak]

Thank you!

[Minu Muhsina]

I used the following code. But it doesn't work on Test 1. It shows Assertion failed.

Could anyone help me with this.

function X = rescale_scores(X)
    X(:,end)=(X(:,end)-60)/10;
end