Get the nearest value when two arrays are logged at different time.with different logging rates

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sc1991 2017-12-12

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https://ww2.mathworks.cn/matlabcentral/answers/372589-get-the-nearest-value-when-two-arrays-are-logged-at-different-time-with-different-logging-rates

评论： sc1991 2017-12-14

Hi! I have two data sets one is logged at 200ms and other is logged at 1 sec. Lets call the data set logged at 1 sec as 'x' and the one logged at 200ms as 'y'. Now what is what value in x will be the closest match to the values in y.

The size of 'y' is 360313x1 and the size of 'x' is 71885x1. Please let me know if any more info will be needed. My apologies I cant share the real data set.

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Jan 2017-12-12

编辑：Jan 2017-12-12

Does the fact, that one data set is recorded with 200ms and the other with 1s play any role in the solution? Are the values sorted?

sc1991 2017-12-12

Yes the data set is sorted.

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Answer 1

Jan 2017-12-12

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/372589-get-the-nearest-value-when-two-arrays-are-logged-at-different-time-with-different-logging-rates#answer_295939

在 MATLAB Online 中打开

y = rand(360313, 1)
x = rand(71885, 1);
index = zeros(size(x));
for k = 1:numel(x)
  [~, index(k)] = min(abs(y - x(k)));
end

Does this match your problem?

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sc1991 2017-12-12

Thanks a lot it works.Thanks so much for the help

sc1991 2017-12-14

Hi! Jan I just saw an issue. So, your programs works fine but I have one sensor that measures speed and I when its trying to find the closest value it will check for any values that's closest to it. But since one is logging at 200ms and the other is logging at 1 sec and they both start at different time. I want that ones we have found the match for first index where they match it just increments and never go below that first match index. will you be able to help?

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