Question

我有以下10次实施，我使用UCI Machine learning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

Answer 1

您正在循环1:numberOfRowsPerFold:dataRowNumber，每次1:x:178和i递增。因此，您可以在index out of bounds上获得results_cell错误。

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

学习调试

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

（要禁用此调试模式，请运行dbclear if error。）

MatLab：索引超出矩阵维度

1 个答案:

学习调试