The end operator must be used within an array index expression

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Sharena Natasha Nor Hisham 2022-1-21

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https://ww2.mathworks.cn/matlabcentral/answers/1633515-the-end-operator-must-be-used-within-an-array-index-expression

评论： Cris LaPierre 2022-1-22

采纳的回答： Cris LaPierre

My output is showing "The end operator must be used within an array index expression." when I try to run this:

%15. split spectograms of background noise between the training, validation, and test sets

numTrainBkg = floor(0.85*numBkgClips);

numValidationBkg = floor(0.15*numBkgClips);

XTrain(:,:,:,end+1:end+numTrainBkg) = Xbkg(:,:,:,1:numTrainBkg);

YTrain(end+1:end+numTrainBkg) = "background";

XValidation(:,:,:,end+1:end+numValidationBkg) = Xbkg(:,:,:,numTrainBkg+1:end);

YValidation(end+1:end+numValidationBkg) = "background";

Please help me solve this..

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Sharena Natasha Nor Hisham 2022-1-22

but now i'm facing another issue after I tried training the network:

Error using trainNetwork (line 184)

Number of observations in X and Y disagree.

Cris LaPierre 2022-1-22

Please create a new question for this as it is unrelated.

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采纳的回答

Cris LaPierre 2022-1-21

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此回答的直接链接

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You cannot use end in a variable that has not yet been created. Here, you are using end in the assignment to all your variables. Since they don't exist yet, you get an error. Consider this example.

a(end)=1
The end operator must be used within an array index expression.

Perhaps you meant to do this:

numTrainBkg = floor(0.85*numBkgClips);
numValidationBkg = floor(0.15*numBkgClips);
XTrain = Xbkg(:,:,:,1:numTrainBkg);
YTrain(1:numTrainBkg) = "background";
XValidation = Xbkg(:,:,:,numTrainBkg+1:end);
YValidation(1:numValidationBkg) = "background";