knn grouping matrix representation

2017 5 3
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更新时间：2017 5 4
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I am new to using KNN and was told that use grouping matruix in the following format for example,
G=[1;1;1;1;1;1;1;1;1;1;2;2;2;2;2;2;2;;3;3;3;3;3;3;3;3;4;4;4;4;4;4;4;4]
surly, supposed i have 500 trainig sample data, woukd i have to put in G 500 numbers and so on? this is not scalable? there must a shorter way of representing G. Thanks you

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回答（1 个）

Walter Roberson
Walter Roberson 2017-5-4

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G = [repmat(1, 1, number_in_first_group), repmat(2, 1, number_in_second_group), repmat(3, 1, number_in_third_group)]
Or
G = [ones(1, number_in_first_group), 2 * ones(1, number_in_second_group), 3 * ones(1, number_in_third_group)]
or
G = repelems([1, 2, 3], [number_in_first_group, number_in_second_group, number_in_third_group])

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