How can I interpolate datetime variables?

Question

Larissa Perez 2016-10-7

0
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https://ww2.mathworks.cn/matlabcentral/answers/306160-how-can-i-interpolate-datetime-variables

评论： Larissa Perez 2016-10-7

Hey everyone! I am new to Matlab and am trying to interpolate datetime variables so I have measurements secondly. The data I got now skips a few seconds. I am using 2016a, so I can't really use retime. And I have tried using datenum but wasn't successful. I want to have a plot with the secondly datetime variable and them pinpoint especific times.

plot(tide.tide.StationDateTime,tide.tide.WaterLevel)
hold on
output = [];
for i = 1 : length(tide.tide.StationDateTime)
      output = ismember(tide.tide.StationDateTime,Log.Log.Date);
      if tide.tide.StationDateTime(output,:)==tide.tide.StationDateTime(i);
      plot(tide.tide.StationDateTime,tide.WaterLevel,'Marker','o','Color','r')
      end
  end

where tide.tide.StationDateTime is the variable I need to interpolate and Log.Log.Date is the time that I want to pinpoint in my plot.

Thanks guys

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Answer 1

Walter Roberson 2016-10-7

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https://ww2.mathworks.cn/matlabcentral/answers/306160-how-can-i-interpolate-datetime-variables#answer_237864

在 MATLAB Online 中打开

It works for me. Tested in R2016a and R2016b.

B = datetime() + hours([0 1 2 3 5 6.2 7]);  %some times to define the data at
Y = rand(1,length(B));                    %some data
C = B(1)+hours(0:7);                      %some times to interpolate the data at
Yinterp = interp1(B, Y, C);               %what the data should be