What is the best way to downsample a tall timetable? Neither "decimate" nor "retime" seems to work.

What is the best way to downsample a tall timetable? Using:

decimate(TT, n);

causes the error "Conversion to logical from tall is not possible." Using:

retime(TT, 'regular', 'mean', 'SamplingRate', n);

causes the error "Invalid parameter name: SamplingRate".

Answer 1

[dpb]

The newTimeStep or newTimes input parameters could be used for the purpose; newTimeStep is a fixed time step so that

newTimeStep=TimeStep*N2/N1; where N1,N2 are the existing, old series lengths or the ratio the decimation factor.

Alternatively, newTimes is a vector of times.

To use decimate you would have to retrieve the data from the time series to a double; the doc doesn't indicate it supports tall arrays, though.