How to extract the values of two datasets from the same date/time from two table ?

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ehsan
ehsan 2018-5-25
编辑： Akira Agata 2018-5-29
Dear all.
I have two big data sets with .mat format, each contains a table (an example of my data can be seen below). My real data are attached.
I would like to extract the values from the same date/time and also when the value of the third column of the second table is 40.
I am getting a little bit confusing to do all steps together.
date time tem wind
__________ ________ ______ ____
2015.06.05 05:10:00 16.677 0.74
2015.06.05 05:20:00 16.773 1.67
2015.06.05 05:30:00 16.915 1.3
2015.06.05 05:40:00 17.534 0.93
2015.06.05 05:50:00 18.2 0.37
t z height speed
__________ ________ ______ _____
2016-02-01 10:00:00 40 0.93
2016-02-01 10:00:00 50 NaN
2016-02-01 10:00:00 60 0.93
2016-02-01 10:00:00 70 1.65
2016-02-01 10:00:00 80 2.03
I know how to extract the data of the second table when the values of the third column is 40.
height = 40 ;
k = sodar_wind{:,3}== height ;
date = sodar_wind{:,1}(k);
time = sodar_wind{:,2}(k);
high = sodar_wind{:,3}(k);
Wind = sodar_wind{:,4}(k);
I appreciate if you could assist.

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采纳的回答

Akira Agata
Akira Agata 2018-5-29
编辑：Akira Agata 2018-5-29
Looking at your data, year-month-day and hour-minute-second information are stored in different columns. In addition, data format for each table are not unified. So, I would recommend adjusting and unifying datetime data for each table before processing. The following is one example.
% Read the data
load('ZEL01.mat');
load('sodar_data.mat');
% Extract rows where "sodar_data.height == 40"
idx = sodar_data.height == 40;
sodar_data(~idx,:) = [];
% Unify datetime format for each table
ZEL01.date.Hour = ZEL01.time.Hour;
ZEL01.date.Minute = ZEL01.time.Minute;
ZEL01.date.Second = ZEL01.time.Second;
ZEL01.date.Format = 'yyyy-MM-dd HH:mm:ss';
ZEL01.time = [];
sodar_data.t.Hour = sodar_data.z.Hour;
sodar_data.t.Minute = sodar_data.z.Minute;
sodar_data.t.Second = sodar_data.z.Second;
sodar_data.t.Format = 'yyyy-MM-dd HH:mm:ss';
sodar_data.z = [];
% Extract the target data
T = innerjoin(ZEL01,sodar_data,'LeftKeys','date','RightKeys','t');
idx = T.height == 40;
T(~idx,:) = [];
The result looks like:
>> head(T)
ans =
8×5 table
date tem wind height speed
___________________ ______ ____ ______ _____
2016-02-01 10:00:00 6.204 0.56 40 NaN
2016-02-01 10:30:00 7.67 0 40 NaN
2016-02-01 11:00:00 8.593 0.37 40 NaN
2016-02-01 11:30:00 10.907 0.56 40 NaN
2016-02-01 12:00:00 13.882 7.79 40 NaN
2016-02-01 12:30:00 14.194 7.79 40 NaN
2016-02-01 13:00:00 13.882 8.35 40 NaN
2016-02-01 13:30:00 13.57 8.53 40 NaN

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