How to calculate area under the curve for bins

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laura9510 2017-3-14

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https://ww2.mathworks.cn/matlabcentral/answers/329850-how-to-calculate-area-under-the-curve-for-bins

编辑： Jan 2017-3-14

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Apologies for my wording; I am relatively new to MATLAB. My problem is:

I've used

AUC (:,i) = trapz(x, y);

and it obviously gives me the areas under the entire curve. I am trying to use a different 'y' (in that this y1 is divided into bins, and each bin is averaged to one value) to find the area under the curve of each bin. However, using trapz(x,y1) gives me the error LENGTH(X) must equal the length of Y in dim 1.. What other possibilities are there?

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Answer 1

Jan 2017-3-14

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https://ww2.mathworks.cn/matlabcentral/answers/329850-how-to-calculate-area-under-the-curve-for-bins#answer_258709

在 MATLAB Online 中打开

[N, edges, bin] = histcounts(y, y1);
Result          = splitapply(@mean, x, bin);

The first command finds the bins of y according to the coarser grid y1. Only the bin output is required. The second line calculates the averages over the bins.