write a function that takes two inputs: arr1, an n x 1 array of doubles arr2, an n x 1 array of doubles in matlab

To write a function that takes two inputs, arr1 and arr2, both of size n x 1, and both containing doubles, we can define a function in MATLAB as follows:

main.m
function myFunction(arr1, arr2)
    % function body goes here
end
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Inside the function body, we can perform any manipulations and computations on the input arrays as required. Here is an example function that sums the two arrays element-wise and returns the result:

main.m
function result = sumArrays(arr1, arr2)
    % Check that the two arrays have the same size and shape
    if ~isequal(size(arr1), size(arr2))
        error('Arrays must have the same size and shape')
    end
    
    % Perform element-wise addition
    result = arr1 + arr2;
end
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To call this function, we can simply pass in the two arrays as arguments:

main.m
arr1 = [1; 2; 3];
arr2 = [4; 5; 6];
result = sumArrays(arr1, arr2);
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This will result in result being a 3 x 1 array containing the sum of the corresponding elements in arr1 and arr2.