MATLAB: Remove outliers from a circumference

geometryoutliers

hi guys.. I have a series of points, those points generates a sort of circumference/ellipse in the 3d space ( intersection between a shpere and a cone).. i want to get rid of the outliers….I've tried using rmoutliers, but nothing.. can you help me?

Best Answer

Here is an idea:

x0 = mean(x);                          % Choose some center point (maybe approximately)
y0 = mean(y);
[t,r] = cart2pol(x,y);                 % convert your data to polar system
[~,ix] = sort(t);                      % sort your data by angle
tol = 0.4;                             % some tolerance
ix1 = find(diff(r(ix) > tol);          % find values where difference of radius is too big
ind = ix(ix1);                         % indices of outlier points
plot3(x(ind),y(ind),z(ind),'or')

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MATLAB: Cartesian to polar cordinate’

use cart2pol function

MATLAB: I need help to plot circle around the points and these points are in a circle. please response

n=10; % number of points that you want
    center = [2 ,2]; % center coordinates of the circle [x0,y0] 

    radius = 10; % radius of the circle

      angle = 2*pi*rand(n,1);
      r = radius*sqrt(rand(n,1));
     X = r.*cos(angle)+ center(1);
     Y = r.*sin(angle)+ center(2);
     plot(X,Y,'.r')
     hold on
     %%Draw circle 
     R = 1. ;  % radius 
     th = linspace(0,2*pi) ;
     for i = 1:length(X)
         x = R*cos(th)+X(i) ;
         y = R*sin(th)+Y(i) ;
         plot(x,y,'b')
     end
     hold on
     center = [2 ,2]; % center coordinates of the circle [x0,y0] 
    radius = 10; % radius of the circle
    angle = 0:.01:2*pi;
    r = radius;
       X = r.*cos(angle)+ center(1);
       Y = r.*sin(angle)+ center(2);
     plot(X,Y,'.b')

Best Answer

Related Solutions

MATLAB: Cartesian to polar cordinate’

MATLAB: I need help to plot circle around the points and these points are in a circle. please response

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