How do I interpolate missing data points in one data set so I can create an ensemble with multiple data sets?

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Vince Clementi 2017-5-25

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https://ww2.mathworks.cn/matlabcentral/answers/341985-how-do-i-interpolate-missing-data-points-in-one-data-set-so-i-can-create-an-ensemble-with-multiple-d

I need to interpolate missing data points in an x,y data set (Age (ka), chemical value). I will need to interpolate chemical values between two given values at times that match with another data set. Ultimately, I will average out these values across multiple data sets in an ensemble.

What function will I need to use, or how would I go about the interpolation step. (If anyone has advice on how to average across multiple data sets, that would also be appreciated.) Thanks.