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values per hour from accumulative data

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Neko Benítez
Neko Benítez on 30 Oct 2019
Edited: Mil Shastri on 31 Oct 2019
I have xlsx files with the timestamp and the total accumulative energy for each timestamp. I want to obtain the energy consumed per hour (kWh) using that information.
I know how to do it following this procedure:
  1. read xlsx file as a table
  2. process the first column (timestamps) to put it in DateTime format
  3. Put the date as a vector with (year / month / day / hour / min / sec)
  4. Then using if conditions and for loops, obtain the first and last data for each hour and calculate the difference.
clear all
close all
filename = ['Etot 05-06.xlsx';];
data = readtable(filename)
data.timestamp = (data.timestamp+7200)/3600/24 + datenum('01-Jan-1970 00:00:00');
data.timestamp = datetime(data.timestamp, 'ConvertFrom', 'datenum');
dv = datevec(data.timestamp);
data.Year = dv(:,1);
data.Month = dv(:,2);
data.Day = dv(:,3);
data.Hour = dv(:,4);
% and then process the data using if conditions and for loops
I am wondering if there is a more effective (or advanced) way to do it, to avoid the recursive use of for loops. Moreover, the data I provided is a small fraction of the total information I have to process. Does anyone have any idea about how to do it?

Answers (1)

Mil Shastri
Mil Shastri on 31 Oct 2019
Edited: Mil Shastri on 31 Oct 2019
I would recommend using the import tool and the automatic code generation (yes, MATLAB will write code that you can reuse). See


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