How to split data into several segments so that in each segment, the number of NaN is not more than a certain value.

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Adib Yusof 2018-1-15

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回答： Image Analyst 2018-1-15

I have a large data which contains around 6,500,000+ data points. I need to split/divide my data into several segments so that in each segment, the number of consecutive NaN is not more than 18,000. What should I try? Thanks.

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Rik 2018-1-15

Is that the only requirement? If so, you can simply use isnan and a bit of code.

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Answer 1

Image Analyst 2018-1-15

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https://ww2.mathworks.cn/matlabcentral/answers/377199-how-to-split-data-into-several-segments-so-that-in-each-segment-the-number-of-nan-is-not-more-than#answer_300212

在 MATLAB Online 中打开

Try this (just off the top of my head):

data = rand(1, 6500000);
segmentLength = 1000000; % Whatever...
nansPerSegment = 30000; % Whatever...
for k = 1 : segmentLength : length(data)
  lastIndex = min(length(data), k + segmentLength - 1);
  thisData = data(k:lastIndex);
  numElements = numel(thisData);
  nanLocations = k + randperm(numElements, nansPerSegment) - 1;
  data(nanLocations) = nan;
end