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I found a MATLAB [http://www.mathworks.com/matlabcentral/fileexchange/15562-k-nearest-neighbors function] for finding the k-nearest neighbors (kNN) within a set of points, which could be useful for homework 3. | I found a MATLAB [http://www.mathworks.com/matlabcentral/fileexchange/15562-k-nearest-neighbors function] for finding the k-nearest neighbors (kNN) within a set of points, which could be useful for homework 3. | ||
| − | I tried it and it works well. I did some experiments using the Wine data set of UCI (http://archive.ics.uci.edu/ml/datasets.html). I used attributes 1 and 7 of the red wine data set (red points) and the white wine data set (grey points). For this simple experiment, I used only the first 100 data points of each set. The following figures show the classification regions using k=1, 3, 7. The red wine region is brown and the white wine region is white. The regions are constructed using MATLAB's contourf function. | + | I tried it and it works well. I did some experiments using the Wine data set of UCI (http://archive.ics.uci.edu/ml/datasets.html). I used attributes 1 and 7 of the red wine data set (red points) and the white wine data set (grey points). For this simple experiment, I used only the first 100 data points of each set. The following figures show the classification regions using k=1, 3, 7. The red wine region is brown and the white wine region is white. The regions are constructed using MATLAB's [http://www.mathworks.com/access/helpdesk/help/techdoc/ref/contourf.html contourf] function. |
[[Image:nn_k_1.jpg]] [[Image:nn_k_3.jpg]] [[Image:nn_k_7.jpg]] | [[Image:nn_k_1.jpg]] [[Image:nn_k_3.jpg]] [[Image:nn_k_7.jpg]] | ||
--[[User:ilaguna|ilaguna]] 15:40, 7 April 2010 (UTC) | --[[User:ilaguna|ilaguna]] 15:40, 7 April 2010 (UTC) | ||
Revision as of 10:42, 7 April 2010
I found a MATLAB function for finding the k-nearest neighbors (kNN) within a set of points, which could be useful for homework 3.
I tried it and it works well. I did some experiments using the Wine data set of UCI (http://archive.ics.uci.edu/ml/datasets.html). I used attributes 1 and 7 of the red wine data set (red points) and the white wine data set (grey points). For this simple experiment, I used only the first 100 data points of each set. The following figures show the classification regions using k=1, 3, 7. The red wine region is brown and the white wine region is white. The regions are constructed using MATLAB's contourf function.
--ilaguna 15:40, 7 April 2010 (UTC)
