How to return data points without the detected once while using Rangesearch function.
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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
采纳的回答
Walter Roberson
2017-8-18
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
5 个评论
Faez Alkadi
2017-8-18
编辑：Faez Alkadi
2017-8-18
Walter Roberson
2017-8-18
Sorry, should be
output_matrix = temp_matrix(points_within_range, :);
Faez Alkadi
2017-8-18
编辑：Faez Alkadi
2017-8-18
Walter Roberson
2017-8-18
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
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