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split a matrix into two matrices according to some rule

조회 수: 5 (최근 30일)
Alberto Acri
Alberto Acri 2024년 2월 12일
댓글: Cris LaPierre 2024년 2월 12일
How can I generate two separate matrices, one containing the coordinates of line A and the other of line B?
load matrix
figure
plot3(matrix(:,1),matrix(:,2),matrix(:,3),'k.','Markersize',5);
axis equal
grid off
I wanted to try this way but it does not seem the best way.
% range
xRange = [xmin xmax];
yRange = [ymin ymax];
zRange = [zmin zmax];
% indices of points in the range
idx = matrix(:,1) >= xRange(1) & matrix(:,1) <= xRange(2) & ...
matrix(:,2) >= yRange(1) & matrix(:,2) <= yRange(2) & ...
matrix(:,3) >= zRange(1) & matrix(:,3) <= zRange(2);
select_matrix = [matrix(idx,1), matrix(idx,2), matrix(idx,3)];
  댓글 수: 5
Alberto Acri
Alberto Acri 2024년 2월 12일
Hi Stephen! sorry, I realised I had not installed 'Image Processing Toolbox'!
Alberto Acri
Alberto Acri 2024년 2월 12일
I wanted to know if there is a way to get the subdivision! I don't have any 'rules' at the moment!

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Cris LaPierre
Cris LaPierre 2024년 2월 12일
편집: Cris LaPierre 2024년 2월 12일
I would look into clustering. Here is an attempt that uses dbscan, a spectral clustring algorithm included in the Statistics and Machine Learning Toolbox.
You can learn more about this and other clustering techniques in our Practical Data Science with MATLAB specialization on Coursera. It's free to enroll. Here is a link to the video Introdcution to Clustering Algorithms.
load matrix.mat
% view the raw data
plot3(matrix(:,1),matrix(:,2),matrix(:,3),'k.','Markersize',5);
% use dbscan to identify clusters
idx = dbscan(matrix,1.5,5);
gscatter(matrix(:,1),matrix(:,2),idx)
  댓글 수: 1
Cris LaPierre
Cris LaPierre 2024년 2월 12일
If you know the number of clusters already, use spectralcluster.
load matrix.mat
idx = spectralcluster(matrix,2);
gscatter(matrix(:,1),matrix(:,2),idx)

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