I'm trying to build a model to include a numerical data input... I'm pretty sure I'm doing a horrible job asking the question (which is why the search doesn't really help me much), so maybe I could give an example:
Let us have 1 compartment where the rate of change is:
dx/dt = x + u
U would be our numerical data, and it is an experimentally measured quantity, which changes as time goes on (and we know the value as it changes, at least for some t)
I could fit the data (U) with some splines in MATLAB, etc, if need be (and get more "data").
What's the best way to get this into my SBML model?