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## Index exceeds the number of array elements

G. Nardi

### G. Nardi (view profile)

さんによって質問されました 2019 年 1 月 16 日

### G. Nardi (view profile)

さんによって コメントされました 2019 年 1 月 17 日
Walter Roberson

### Walter Roberson (view profile)

さんの 回答が採用されました
I am still in school learning matlab and need some help. I have seen other ones like this but they don't go into what to do with a double.
I loaded a file that has a double 10000x2
and I am getting this error.
Index exceeds the number of array elements (2).
Error in Week2(line 14)
classTwoTrainingIndices = randomizedIndices(1:6000);

Walter Roberson

### Walter Roberson (view profile)

2019 年 1 月 17 日
It is easier for us to work with code rather than with images of code.

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R2018b

## 1 件の回答

### Walter Roberson (view profile)

2019 年 1 月 17 日
採用された回答

randsample() by default is selection without replacement. When you pass in an integer as the first parameter, the implication is to select from 1 to the integer. As you are passing in the same integer as the second parameter, the effect you are going to get is a permutation of the numbers from one to the integer. Since NumberOfClassOneSamples is 2, that is going to be a random permutation of [1 2]... which will give you either [1; 2] or [2; 1] as the answer.
You then try to take the first 6000 entries in that pair of numbers.
In your code each row appears to represent a sample. The number of samples in of data would then be size(ClassOne, 1) not size(ClassOne,2)
Also, classOneTrainingData should be classOne(classOneTrainingIndices, :) because you want all of the entries in the row.

G. Nardi

### G. Nardi (view profile)

2019 年 1 月 17 日
Thanks I appreciate the explanation. It was great great help!

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