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ValeryOchkov24-Ruby IV
24-Ruby IV
July 4, 2013
Solved

DAE in Prime - work with units

  • July 4, 2013
  • 8 replies
  • 3702 views

You can see in attach a solution one DAE (Simple Pendulum Motion) problem.

Without units - OK

With units - not OK

What is the problem?

Best answer by ValeryOchkov

Jakov Kucan wrote:

The issue has been fixed in Prime 3.0 -- coming out soon.

Thanks, Яков!

All OK in Prime 3:

DAE-Prime-3.png

8 replies

AlanStevens19-Tanzanite
19-Tanzanite
July 5, 2013

I can't see a good reason for your DAE to fail with units but work without units. I've attached an x-y version that does work with units, but it is formulated in ODE-only form, not DAE form (and if I change it to DAE form it fails with the same "incompatible units" error).

Alan

ValeryOchkov24-Ruby IVAuthor
24-Ruby IV
July 5, 2013

AlanStevens wrote:

I can't see a good reason for your DAE to fail with units but work without units. I've attached an x-y version that does work with units, but it is formulated in ODE-only form, not DAE form.

Alan

It seems to me that Prime can solve ODEs with units, but cannot solve DAE with units.

Jakov! Is it so?

PS

Allan, I will be in London (University of Greenwich) 8/30-7/9 and will be glad to present You my Mathcad-clock - http://communities.ptc.com/thread/32536

OK?

AlanStevens19-Tanzanite
19-Tanzanite
July 5, 2013

Valery Ochkov wrote:

PS

Allan, I will be in London (University of Greenwich) 8/30-7/9 and will be glad to present You my Mathcad-clock - http://communities.ptc.com/thread/32536

OK?

Great! But what are the dates exactly? Is that 30th Aug to 7th Sept. or what?

I guess these are the dates as the conference on water and steam properties is 1st to 5th Sept. I have a meeting in London on 4th Sept. Hopefully we can meet then.

Alan

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