Index in position 2 exceeds array bounds (must not exceed 1)

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Frisda Sianipar 2021-4-28

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/816050-index-in-position-2-exceeds-array-bounds-must-not-exceed-1

评论： Frisda Sianipar 2021-5-4

采纳的回答： David Fletcher

i get error on this code, can anybody help me please?

The error: Index in position 2 exceeds array bounds (must not exceed 1).

Error in KNN (line 3)

group=latih(:,3);

the code :

x=xlsread("datatraining.xlsx");
latih=x;
group=latih(:,3);
latih = [latih(:,1) latih(:,2)];
for i = 1 : 80
    y=xlsread("datatesting.xlsx");
    sampel = y;
    test = [sampel(:,1) sampel(:,2)];
%sampel = [2.6136  0.1284 1.3017  -0.8089  0.0441  -0,2084];
    hasil=knnclassify(test,latih,group);
end
nama = "hasil KNN.xlsx";
hasil = [sampel(:,1) sampel(:,2) sampel(:,3) hasil];
xlswrite(nama,hasil);

Thankyou in advance

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David Fletcher 2021-4-28

The error would suggest that for whatever reason the data you have read consists of only a single column (hence you get the error when trying to index the third column). Look at latih in the workspace - what size does it say it is?

Frisda Sianipar 2021-4-29

there are three column

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采纳的回答

David Fletcher 2021-4-29

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/816050-index-in-position-2-exceeds-array-bounds-must-not-exceed-1#answer_687550

编辑：David Fletcher 2021-4-29

OK - if you look at the documentation of xlsread, it says the function is no longer recommended to be used. Better to use readtable instead.

x=readtable("datatraining.xlsx");
latih=x;
group=latih(:,3);
latih = [latih(:,1) latih(:,2)];
for i = 1 : 80
    y=readtable("datatesting.xlsx");
    sampel = y;
    test = [sampel(:,1) sampel(:,2)];
%sampel = [2.6136  0.1284 1.3017  -0.8089  0.0441  -0,2084];
    hasil=knnclassify(test,latih,group);
end
nama = "hasil KNN.xlsx";
hasil = [sampel(:,1) sampel(:,2) sampel(:,3) hasil];
xlswrite(nama,hasil);

As to your other code, I can't comment as I don't have the toolbox on hand with knnclassify. The use of xlswrite (at the end of your code) is also deprecated, so may possibly also produce unpredictable results (as you found with xlsread)