Help with element manipulation of matrix
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Matthew Lozancich
on 12 Nov 2017
Edited: Walter Roberson
on 12 Nov 2017
So the question I have been asked to do is:
Write a function called digit_compare.m which takes as input two 28 × 28 matrices, and returns the sum of the squares of the differences between the corresponding elements.
Here is what I have done so far. What did I do wrong?
function sum=digit_compare(X,Z)
X=zeros(28);
Z=zeros(28);
n=0;
sum=0;
for i=[1:28]
for j=[1:28]
n=((X(i,j))-(Z(i,j))).^2;
sum=sum+n;
end
end
end
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Accepted Answer
Walter Roberson
on 12 Nov 2017
Edited: Walter Roberson
on 12 Nov 2017
You did not take into account the possibility that the inputs might be unsigned integers. When you subtract a larger unsigned integer from a smaller unsigned integer, the result is 0 rather than a negative number.
Also, you overwrite all user-provided inputs with zeros.
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