Writing a conditional statement for timeseries data
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Hi,
In the code attached, I want to write a conditional statement based on datetime and sunrise sunset time. Sunrise is the sunrise time as character vector, sunrise_new is the sunrise time after converting it to HHMM format using datenum (but i am not sure which one to use). I want to figure out if it's a day or night based on datetime and sunrise sunset data. My code should read like:
If HH:MM value in DateTime is > sunrise & < sunset
time = 1
If HH:MM value in DateTime < sunrise & > sunset
time = 0
end
I don't know how to properly write conditional statement in matlab yet.
回答（1 个）
Hi,
In order to compare the times, you can use the "datenum()" function as shown in the below example:
% Getting current time
now=datetime('now')
% Converting datetime to serial date number
format long
hour=now.Hour;
minn=now.Minute;
time_to_check=datenum(hour+":"+minn,'HH:MM')
sunrise = datenum('07:36', 'HH:MM' );
sunset = datenum('17:46', 'HH:MM' ) ;
% Conditional statement to figure out if it's a day or night
if time_to_check<sunrise || time_to_check>sunset
time=0;
else
time=1;
end
You can refer to the below Documentation link for "datenum" function along with the MATLAB Answers link:
2 个评论
Benju Baniya
2022-8-30
Walter Roberson
2022-8-30
No loop needed, no datenum() needed
time = isbetween(joined_eddy.DateTime, joined_eddy.Sunrise, joined_eddy.Sunset, 'closed');
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