Modify Periodic_12_19_2020 to make A a variable. Keep original normalization; i.e., T=vinf* t / dc.
Modify to eliminate P0.inf as a variable to reduce number of equations to 8 so that Stiffb can be used.
Still have 9 equations. Specify khat (temporarily) to check out Stiffb and using augmented Jacobian. Still getting error with 8 equations.Reduce equations by 1 to see if message means 8 or more.
tp is period, A is amplitude