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我有以下 10 折实现，我正在使用UCI 机器学习发布的数据集，这是数据集的链接：

Here are my dimensions

x = 

      data: [178x13 double]
    labels: [178x1 double]

这是我得到的错误

Index exceeds matrix dimensions.

Error in GetTenFold (line 33)
    results_cell{i,2} = shuffledMatrix(testRows ,:);

这是我的代码：

%Function that accept data file as a name and the number of folds
%For the cross fold
function [results_cell] = GetTenFold(dataFile, x)
%loading the data file
dataMatrix = load(dataFile);
%combine the data and labels as one matrix
X = [dataMatrix.data dataMatrix.labels];
%geting the length of the of matrix
dataRowNumber = length(dataMatrix.data);
%shuffle the matrix while keeping rows intact 
shuffledMatrix = X(randperm(size(X,1)),:);

crossValidationFolds = x;
%Assinging number of rows per fold
numberOfRowsPerFold = dataRowNumber / crossValidationFolds;

crossValidationTrainData = [];
crossValidationTestData = [];
%Assigning 10X2 cell to hold each fold as training and test data
results_cell = cell(10,2);
    %starting from the first row and segment it based on folds
    i = 1;
    for startOfRow = 1:numberOfRowsPerFold:dataRowNumber
        testRows = startOfRow:startOfRow+numberOfRowsPerFold-1;
        if (startOfRow == 1)
            trainRows = (max(testRows)+1:dataRowNumber);
        else
            trainRows = [1:startOfRow-1 max(testRows)+1:dataRowNumber];
            i = i + 1;
        end
        %for i=1:10
        results_cell{i,1} = shuffledMatrix(trainRows ,:);
        results_cell{i,2} = shuffledMatrix(testRows ,:); %This is where I am getting my dimension error
        %end
        %crossValidationTrainData = [crossValidationTrainData ; shuffledMatrix(trainRows ,:)];
        %crossValidationTestData = [crossValidationTestData ;shuffledMatrix(testRows ,:)];
    end
end
4

1 回答 1

6

您正在循环遍历1:numberOfRowsPerFold:dataRowNumber哪个 is1:x:178并且i每次都递增。所以这是一种你可以得到index out of bounds错误的方法results_cell。

获取错误的另一种方法是testRows选择超出范围的行shuffledMatrix。

学习调试

要在发生错误时暂停代码并开始调试，dbstop if error请在执行代码之前运行。这样编译器会在遇到错误时进入调试模式，您可以在事情搞砸之前检查变量的状态。

（要禁用此调试模式，请运行dbclear if error。）

于 2012-10-04T06:27:26.970 回答