k-Nearest Neighbors (kNN) Classifier
Function
1. kNNeighbors.predict(_)
2. kNNeighbors.find(_)
Description
1. Returns the estimated labels of one or multiple test instances.
2. Returns the indices and the respective distances of the k nearest training instances.
Examples using Iris Data Set
load fisheriris
X = meas;
Y = species;
Xnew = [min(X);mean(X);max(X)];
k = 5;
metric = 'euclidean';
mdl = kNNeighbors(k,metric);
mdl = mdl.fit(X,Y);
Ypred = mdl.predict(Xnew)
Ypred =
'setosa'
'versicolor'
'virginica'
Ynew = {'versicolor';'versicolor';'virginica'};
accuracy = accuracy_score(Ypred,Ynew)
accuracy =
0.6667
See examples in the script files.
引用格式
David Ferreira (2019). k-Nearest Neighbors (kNN) (https://www.mathworks.com/matlabcentral/fileexchange/67018-k-nearest-neighbors-knn), MathWorks. Retrieved January 23, 2019.
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版本 | 已发布 | 发行说明 | |
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2.2.1 | See release notes for this release on GitHub: https://github.com/ferreirad08/kNNeighborsClassifier/releases/tag/2.2.1 |
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2.2.0 | See release notes for this release on GitHub: https://github.com/ferreirad08/k-Nearest-Neighbors-kNN-Algorithm/releases/tag/2.2.0 |
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2.1.9 | See release notes for this release on GitHub: https://github.com/ferreirad08/k-Nearest-Neighbors-kNN-Algorithm/releases/tag/2.1.9 |
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2.1.8 | Find function added |
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2.1.7 | Description correction |
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2.1.6 | Description correction |
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2.1.5 | Description correction |
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2.1.4 | Description correction |
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2.1.3 | 3-D chart added and cell type label support. |
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2.1.2 | The plotting 3-D function was added in the main algorithm. |
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2.1.1 | More markers were added to the chart. |
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2.1.0 | The plotting function was added in the main algorithm. |
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2.0.9 | Function Pack |
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2.0.8 | Title correction |
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2.0.7 | Title correction |
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2.0.6 | Added to github. |
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2.0.5 | New tools have been added, bringing a more complete algorithm. |
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2.0.4 | Simplification in k nearest instances and k nearest labels |
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2.0.3 | Basic update |
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2.0.2 | Update in maximum frequency |
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2.0.1 | Simplification in frequency verification |
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2.0.0 | Check the frequencies using 'histcounts' |
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1.62 | Title correction |
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1.61 | Correction of the k nearest labels. |
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1.60 | Returns the k nearest labels. |
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1.54 | Basic update |
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1.53 | Updating the Euclidean distance between two points |
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1.52 | Description correction |
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1.51 | Description correction |
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1.5 | Elements sorted by "sort" function and reduced processing time by approximately 1/3. |
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1.1.0.0 | Update of the calculation of the Euclidean distance between two points |
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1.0.0.0 | Description correction
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