MATLAB: How to retain duplicate while using ScatteredInterpolant

interpolationMATLAB

I want to retain duplicates when using ScatteredInterpolant because I am getting warning:"Warning: Duplicate data points have been detected and removed – corresponding values have been averaged. "

Best Answer

1-d is sufficient to explain here.

x = [1 2 3 3 4 5];
y = [1 2 3 4 5 6];

There is a replicated x, with two distinct values of y. Exactly what do you think "retaining the duplicate" means here? What value of y should be interpolated when x==3?

A property of interpolation is that for any given x, if one of the original data points is interpolated, you should get out exactly the same value as went in. (At least, exact to within floating point trash.)

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MATLAB: How to extrapolate data

F = scatteredInterpolant(x(:), y(:), d(:));
interpolated_d = F(X, Y);

MATLAB: Find missing element between two matrix

>> A = [1,2;3,6;3,5;1,4;4,6;2,7;1,6;6,5;2,3;6,7;3,4];
>> B = [1,2;1,6;2,3;3,4;4,6];
>> R = setdiff(A,B,'rows')
R =
   1   4
   2   7
   3   5
   3   6
   6   5
   6   7

To get the same order, use the 'stable' option or this:

>> [~,X] = setdiff(A,B,'rows');
>> X = sort(X);
>> R = A(X,:)
R =
   3   6
   3   5
   1   4
   2   7
   6   5
   6   7

Best Answer

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