How to remove five lines before every NaN in the vector?

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Daria Ivanchenko 2020-4-27

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https://ww2.mathworks.cn/matlabcentral/answers/521031-how-to-remove-five-lines-before-every-nan-in-the-vector

评论： Walter Roberson 2020-4-27

Hi everybody!

I am working with eye movements and currently analyzing some data from my experiments. I have a vector of data in Matlab which is indicating the position of the eye. After I imported the ASCII-file to the Matlab, I started to have some strange numbers before every NaN in the vector (I am attaching the file). How can I remove about 5 arrays before and after every NaN in the vector? These arrays I want to replace with NaNs again. I know that it should be really easy to do but my Matlab skills are not enough.

I will very grateful if somebody can help.

Thank you!

Best,

Daria

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Answer 1

Walter Roberson 2020-4-27

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https://ww2.mathworks.cn/matlabcentral/answers/521031-how-to-remove-five-lines-before-every-nan-in-the-vector#answer_428632

在 MATLAB Online 中打开

NL = find(isnan(Data));
zap_at = unique(NL+(-5:5));
Data(zap_at) = nan;

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Daria Ivanchenko 2020-4-27

Thank you, Walter! Should I put the name of my vector instead of Data? And what is NL and zap_at?

Sorry, I am just too bad in Matlab :(

Walter Roberson 2020-4-27

yes Data is your vector.

NL is nan locations, the places that the nans are.

zap_at is the places to overwrite with nan.

The code assumes that some of the nan might be within 5 of each other and filters out the duplicates. You could probably get away without the unique() call.

The code as written relies on R2016b or later

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