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Find duplicate of first xx entries and average associated values

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Minh Phuong Truong
评论： Minh Phuong Truong 2022-7-7
Hi all,
I have 140000x3 array data (time, lat, lon). The time column looks like [2019/12/18 上午 07:53:00]. I would like to get the mean lon and lat of several points in the same minute, like [2019/12/18 上午 07:53].
Thanks
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Chris Burschyk
Chris Burschyk 2022-7-7
You could load the data into a timetable and then use something like
T = readtimetable("YourFile.csv");
YourYear = 2019;
YourMonth = 1;
YourDay = 8;
YourHour = 8;
YourMin = 41:
mean(T{T.SYSTEMTIME.Year == YourYear & T.SYSTEMTIME.Month == YourMonth & T.SYSTEMTIME.Day == YourDay & T.SYSTEMTIME.Hour == YourHour & T.SYSTEMTIME.Minute == YourMinute, "LONGITUDE" })
Maybe not the prettiest way to do, but you could use it with a loop as well.

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KSSV
KSSV 2022-7-7
Read the file into MATLAB using readtable.
See to it that your dates i.e. thirs column is in datetime class. For this read about datetime, datestr, datenum.
Find the duplicates using unique. By using the indices you can get the required mean.

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