Incorrect datatype when using 'retime' function

I'm designing a model for a windturbine. The model calcualtes power generated everyhour. I'm trying to use the retime function to sum thos data and produce daily totals.

windtest is a table of results that looks like this:

windtest =

  73×4 table

        Date        WindSpeed    PowerOutput    PowerOutputKw
    ____________    _________    ___________    _____________

    10.02. 00:00       3.8          34.21          0.03421   
    10.02. 01:00       3.1         18.573         0.018573   
    10.02. 02:00         4         39.901         0.039901   
    10.02. 03:00       3.6         29.088         0.029088   
    10.02. 04:00       3.5          26.73          0.02673   
    10.02. 05:00         4         39.901         0.039901   
    10.02. 06:00       4.1         42.969         0.042969   
    10.02. 07:00       3.5          26.73          0.02673   
    10.02. 08:00       4.3         49.569         0.049569   
    10.02. 09:00       4.9         73.348         0.073348   
    10.02. 10:00       4.5         56.812         0.056812   
    10.02. 11:00       4.3         49.569         0.049569   
    10.02. 12:00       4.7         64.728         0.064728   
    10.02. 13:00       4.7         64.728         0.064728   
    10.02. 14:00       4.5         56.812         0.056812   
    10.02. 15:00       5.2         87.662         0.087662   
    10.02. 16:00       4.9         73.348         0.073348   
    10.02. 17:00       4.7         64.728         0.064728   
    10.02. 18:00       4.5         56.812         0.056812   
    10.02. 19:00       4.1         42.969         0.042969   
    10.02. 20:00       3.6         29.088         0.029088   
    10.02. 21:00         4         39.901         0.039901   
    10.02. 22:00       3.8          34.21          0.03421   
    10.02. 23:00         4         39.901         0.039901   
    11.02. 00:00         4         39.901         0.039901   
    11.02. 01:00       4.1         42.969         0.042969   
    11.02. 02:00       3.8          34.21          0.03421   
    11.02. 03:00         4         39.901         0.039901   
    11.02. 04:00       3.5          26.73          0.02673   
    11.02. 05:00       3.3         22.405         0.022405   
    11.02. 06:00       3.5          26.73          0.02673   
    11.02. 07:00       3.8          34.21          0.03421   
    11.02. 08:00       4.1         42.969         0.042969   
    11.02. 09:00       4.7         64.728         0.064728   
    11.02. 10:00       4.9         73.348         0.073348   
    11.02. 11:00       4.7         64.728         0.064728   
    11.02. 12:00       5.2         87.662         0.087662   
    11.02. 13:00       5.9         128.04          0.12804   
    11.02. 14:00       5.7         115.46          0.11546   
    11.02. 15:00       5.4         98.171         0.098171   
    11.02. 16:00       5.7         115.46          0.11546   
    11.02. 17:00       5.7         115.46          0.11546   
    11.02. 18:00       6.7         187.51          0.18751   
    11.02. 19:00       4.5         56.812         0.056812   

I'm then summing the PowerOutputcolumn according to the day using retime:

BOS = windtest(:, 'PowerOutput');
powerperday2 = retime(BOS,'daily','sum');

However when I run this I get the following error:

Check for missing argument or incorrect argument data type in call to function 'retime'.

Error in WindTurbine (line 42)
powerperday2 = retime(BOS,'daily','sum');

I think i've followed the documentation properly, but cannot find another example of this error online - if anyone could help poiunt out where I'm going wrong it would be greatly appreciated.

Cheers,

I x

Answer 1

[Star Strider]

The retime function works only with timetable arrays, to the best of my knowledge. See if using the table2timetable funciton first will eventually produce the desired result.

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