Hi,
In order to understand the query better, please provide the following information,
- A sample data for the two timeseries?
- The details about which Simulink concatenate block you are using (preferable with a sample model itself)?
- What is meant by “neatly” in your question?
- Is the data an object of timeseries class or is it just a matrix with first column as datetime and the second column containing data?
You can try using MATLAB function block inside the Simulink if it fits your use case and inside that, add the commands to append the two datasets.
If using a timeseries object, consider using timetables instead.
You can refer to the following documentation on timeseries, timetables and MATLAB function block for more information on them