How to return data points without the detected once while using Rangesearch function.

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Faez Alkadi 2017-8-18

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https://ww2.mathworks.cn/matlabcentral/answers/353256-how-to-return-data-points-without-the-detected-once-while-using-rangesearch-function

评论： Faez Alkadi 2017-8-18

How to get red of the detected data points in the matrix [x y] (The points with in the range 0.5) and make the next code returns a new matrix [X Y] withOUT the detected ones with in the range 0.5 .

x = gallery('uniformdata',30,1,1);
y = gallery('uniformdata',30,1,10);
plot(x,y,'.')
k = boundary(x,y);
hold on;
plot(x(k),y(k));
%%get points at distance 0.5 from boundary 
idx = rangesearch([x y],[x(k) y(k)],0.5);
% plot the points
N = length(k) ;
for i = 1:N
plot(x(idx{i}),y(idx{i}),'O','color',rand(1,3)) ;
end

Thank you

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采纳的回答

Walter Roberson 2017-8-18

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https://ww2.mathworks.cn/matlabcentral/answers/353256-how-to-return-data-points-without-the-detected-once-while-using-rangesearch-function#answer_278452

在 MATLAB Online 中打开

points_within_range = unique([idx{:}]);
temp_matrix = [x, y];
output_matrix = temp_matrix(~points_within_range, :);

In my test, the resulting output matrix is empty, because with that distribution of points, every point is within 0.25 of some edge point. The average distance to some edge point was about 0.11

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Walter Roberson 2017-8-18

在 MATLAB Online 中打开

Sorry, I lost track.

temp_matrix = [x, y];
points_not_within_range = setdiff( 1:size(temp_matrix,1), unique([idx{:}]) );
output_matrix = temp_matrix(points_not_within_range, :);

The ~ version does not work because points_within_range was a vector of indices rather than a logical vector.

Faez Alkadi 2017-8-18