units in ODE solvers

[HarveyHensley]

1. The current status in Prime 3 is that the ODE line solvers and odesolve will accept units with the variables. As shown in the attached file, the Rkadapt and Bulstorer methods get the correct answer in terms of the default units, but the units are not shown. They should all be consistent, showing the units for the results.
2. All of the dependent variables must have the same dimension in all but two of the solvers...odesolve and rkfixed. In odesolve and rkfixed, each ODE and dependent variable may have a different dimension. Since odesolve can automatically call RKadapt and other solvers, it is not clear if those solvers operate with multiple dimensions in odesolve. Since we cannot manually select the method in odesolve, there is no way to test.

ode with units.mcdx.zip

[HarveyHensley]

I should add that I haven't tested the stiff eq. solvers, only those shown in the prime file.

[HarveyHensley]

Odesolve can't work with units when it calls sbval.

http://communities.ptc.com/message/243535#243535

[ValeryOchkov]

But I know only one software for the solving ODEs with units - Mathcad Prime !

Or?

[HarveyHensley]

Working with units in odes only some of the time doesn't really qualify Prime either.

[olivierlp]

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