title: How to deal with multiple time series in MATLAB?
body: <p>I have some smart meter data which shows gas and electricity meter readings at 30 min intervals for about two years, for 16000 households.</p>
  
  <p>The date is stored in separate .mat files, with a datetime variable for the timestamp and a double variable for the actual data. Some of the data has gaps in, from a few hours to several days or weeks. I want to create a timeseries object containing all of the data and a continuous timestamp for the two year period, so that I can then interpolate the gaps.</p>
  
  <p>Another option would be to use snychronize, but for this it seems the 16000 data series need to be in individual timeseries objects, which seems cumbersome. </p>
  
  <p>I have tried this with timeseries objects and financial time series but cannot get all of the 16000 data series and corresponding timestamps into one time series object. When I try to add more than one series to an existing timeseries object, it is added "in series" rather than "in parallel" (i.e. data in the Data:1 column).</p>
  
  <p>When I tried with a financial time series I had difficulties preparing the datetime data in a cell array.</p>
  
  <p>Any ideas what the most efficient way to do this is?
  Thanks 
  Russell</p>