The measurement scalar/vector check should only check the states and times

[moorepants]

It doesn't make sense to pass in vectors of the constants (if it does that).

It's also hard to get the scalar and vector working nicely. Maybe we should just use vectorize.

Here is what a ramp input function has to look like:

def eval_ramp(Ft, time):
    if np.isscalar(time):
        if time < 3.0:
            return 0.0
        else:
            return Ft*time - Ft*3.0
    else:
        return (time >= 3.0) * (Ft*time - Ft*3.0)

sys.add_measurement('F', eval_ramp)

[moorepants]

np.vectorize() doesn't work because it renames the function arguments and we rely on know the names of the function arguments.

[moorepants]

np.vectorize() also does not return a scalar if passed scalars, it always returns an array.