Finding values on only time (excluding date)

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sikander shahzad
sikander shahzad 2017-10-5
评论： Cam Salzberger 2017-10-6
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sikander shahzad
sikander shahzad 2017-10-6
variables are value1 (6 x 1) double, value2 (6 x 1) and value3 (6 x 1). whereas date/time is (6 x 1) cell array.

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回答（2 个）

Cam Salzberger
Cam Salzberger 2017-10-5
Hello Sikander,
If you can import your data and get it into a datetime format - readtable is good for this - then this is pretty easy. Just use timeofday to drop the date portion of the datetime.
-Cam
Andrei Bobrov
Andrei Bobrov 2017-10-5
T = readtable('data1.xlsx');
T.Date_Time = datetime(join(string(T{:,1:2})),'I','dd-MM-uuuu HH:mm');
T = T(:,[1,3:end]);
out = T(hour(T{:,1}) == 8,:);
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sikander shahzad
sikander shahzad 2017-10-6
I have data with many row. kindly show me the way to use find function and with the help of index i can fetch required result.
Cam Salzberger
Cam Salzberger 2017-10-6
You generally shouldn't need to use the "find" function. It is often more efficient to just use logical indexing directly. That is what is being done with Andrei's example. The expression:
logicalArray = hour(T{:, 1}) == 8;
will produce a logical array of the same number of rows as T, with "true" whenever the hour value in the first column of T is 8. When you do:
T(logicalArray, :)
it will return only those rows that were "true" in the logical array.
-Cam

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