MATLAB Answers

HOW TO FILTER AN HOUR DATA FROM ARRAY OF DAILY,MONTHLY AND YEAR DATA

18 views (last 30 days)
Ojo Olusola
Ojo Olusola on 19 Jun 2021
Edited: Scott MacKenzie on 22 Jun 2021
I HAVE DATA WITH FOLLOWING COLUMN: DATE, TIME, S/N, VALUES AS SHOWN IN THE ATTACHED FILE. KINDLY HELP ME WITH CODE TO SEPARATE THE DATA INTO DIFFERENT HOURS SUCH AS 7.30, 8.30, ..., 15.30 AND DIFFERENT MONTHS, JANUARY, FEBRUARY, ... THANKS.
OJO O.S. ojoso@futa.edu.ng
  2 Comments
Ojo Olusola
Ojo Olusola on 19 Jun 2021
Yes, I want the data sorted by hour and also sorted by month.
That is,
I want the data of each hour sorted separately such as 7.30, 8.30, 9.30, ..., 15.30 across 01-Jan-2000 to 31-Dec-2020. Also, for each time such as 7.30, l want to sort the data of each of the month separately. Thanks.

Sign in to comment.

Answers (1)

Scott MacKenzie
Scott MacKenzie on 19 Jun 2021
Edited: Scott MacKenzie on 22 Jun 2021
T = readtable('https://www.mathworks.com/matlabcentral/answers/uploaded_files/658625/SAMPLE%20DATA.xlsx');
% combine DATE and TIME columns and replace as single DateTime column
DateTime = T.DATE + T.TIME;
DateTime.Format = 'yyyy-MM-dd HH:mm';
T = [table(DateTime) T(:,3:end)];
% for sorting, create separate columns for year, month, and hour
T.Year = year(T.DateTime);
T.Month = month(T.DateTime);
T.Hour = hour(T.DateTime);
yearColumn = find(string(T.Properties.VariableNames) == "Year");
monthColumn = find(string(T.Properties.VariableNames) == "Month");
hourColumn = find(string(T.Properties.VariableNames) == "Hour");
% sort by month
T1 = sortrows(T, monthColumn);
% sort by hour
T2 = sortrows(T, hourColumn);
% sort by hour, separately within each year
T3 = sortrows(T, [yearColumn hourColumn]);
  4 Comments
Scott MacKenzie
Scott MacKenzie on 21 Jun 2021
Converting to a double array is simple except for the 1st column, since the data in the 1st column are DateTime.
If you just want the numeric data, which start in the 2nd column, then
T{:,2:end}
If you want to include the DateTime information, it must be converted to a serial date number. This will do the trick:
[datenum(T.DateTime) T{:,2:end}]

Sign in to comment.

Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!