The resample method can only be used for a single timeseries object The time series StartDate property must be a valid date character vector or string when resampling with dates. Time must be specified either as a cell array of dates, a numeric vector, or as a scalar. Invalid interpolation method Quality vector must be initialized. The specified quality code has been rounded to an integer. You have specified a quality code that is not defined for this time series. You have specified a quality code that is not defined for this time series. Cannot perform numeric operations on timeseries which have non-numeric data There must be at least two original data samples to carry out the resample function.