Interpolation with nearest neighbor for model evaluation

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Daphne PARLIARI 2020-2-11

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https://ww2.mathworks.cn/matlabcentral/answers/504880-interpolation-with-nearest-neighbor-for-model-evaluation

评论： Rik 2020-2-13

Hi all!

I have to evaluate the simulated values from a numerical model (attached .csv), comparing them with actual measurements from weather station (.txt). As you can see in the csv file, the modeled values are hourly, while the time-step in txt is different. What I want to do is compare the nearest value time-wise from the actual measurement (txt) with the respective value from csv, eg. csv 00.00 corresponds to txt 00.00, and not txt 00.50.

To my understanding, this will happen with

yi = interp1(x,Y,xi,'nearest').

However I fail to understand to which columns x,Y and xi correspond. Sorry for the trivial question but I am totally confused.

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Rik 2020-2-13

You have some work to do before you start thinking about interpolation. First you should read your data to variables with an appropriate data type. Parse the date and time codes to datetime. That will also make it a lot easier to line up your two data sets.

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