MATLAB: Define variable inputs for function

Financial ToolboxMATLABvariables

Hello,
could you please help me with the next problem.
I'm trying to merge N financial time series objects by
function newfts = merge(fts1, fts2, ..., ftsx).
How may I define a variable inputs for that? Because, when I have 2 time seriesobjects it becomes:
newfts = merge(fts1, fts2);
When I have 3:
newfts = merge(fts1, fts2, fts3);
How to avoid of examination of all posible options?