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Implement an equation with a substraction and division of two arrays

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Sara Alonso Vicario
编辑： Sara Alonso Vicario 2021-4-7
I want to implement this equation in Matlab
The a values are in an array of 140x1 double called approx, the values of x are also in an array of 140x1 double called subArray, and n is an array 1x1 with a value equal to 140.
I am using the following code:
MRE=(1/n)*(abs(approx(:,1)- subArray(:,1))/abs(subArray(:,1)));
but Im getting the following error
Unable to perform assignment because the left and right sides have a different number of elements.
How could I implement this equation in Matlab?

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采纳的回答

Sara Alonso Vicario
编辑：Sara Alonso Vicario 2021-4-7
Here you want element-wise division. Also don't forget the summation:
MRE = (1/n) * sum((abs(approx - subArray) ./ abs(subArray)));
^^^ ^
Using some random data:
clc, clear, rng(3);
n = 140;
approx = rand(n, 1);
subArray = rand(n, 1);
MRE = (1/n) * sum((abs(approx - subArray) ./ abs(subArray)))
% MRE =
%
% 4.2877
(answer by the user tdy in stackoverflow)

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