How to remove outliers from a set of 2D points?

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Hadi Ghahremannezhad 2020-10-1

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https://ww2.mathworks.cn/matlabcentral/answers/603385-how-to-remove-outliers-from-a-set-of-2d-points

评论： Hadi Ghahremannezhad 2020-10-1

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My question has two parts:

I have two 1D arrays containing X and Y values. How can I create another 1D array where each element is a 2D point?
How to remove outliers from the resulting array?

For example, something like this:

x = [1 3 2 4 2 3 400];
y = [2 3 1 4 2 1 500];
xy = [[1 2] [3 3] [2 1] [4 4] [2 2] [3 1] [400 500]];
result = rmoutliers(xy, 'mean');

The result should look like:

result = [[1 2] [3 3] [2 1] [4 4] [2 2] [3 1]]

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John D'Errico 2020-10-1

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Arrays in MATLAB are not composed of multiple elements in every element. Those extra square brackets were meaningless.

For example, this just creates a row vector of length 14.

xy = [[1 2] [3 3] [2 1] [4 4] [2 2] [3 1] [400 500]];

Better is to use a 2 dimensional array. Thus

xy = [1 2;3 3;2 1;4 4;2 2;3 1;400 500];
xy =
   2
   3
   1
   4
   2
   1
 500

As you can see, I dropped the spurious brackets.

Anyway, a number is just a symbol. It has no intrinsic meaning unless you put some meaning to the symbol. In this case, I might consider each row as representing the (x,y) coordinates of a point in 2-dimensions.

Hadi Ghahremannezhad 2020-10-1