24-Ruby IV

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Error by ode solution

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Why I have an error by ode solution?

Same ode in Prime has no error!

See please Mathcad 15 sheet in attach!

1_tulip.rar

Calculus_Derivatives

Werner_EAnswer

25-Diamond I

> Help please!

I can't as a I am not real sure If MC should solve this system - its not a normal system of ODEs anyway.

My question was what you changed in the converted file in Prime to make it work.

.) Prime should work with your dummy units, too.

.) Prime should work with the derivative operator, too (it should not be necessary to use the prime symbol '')

.) Prime should work without providing the number of steps.

The above three were the only changes I was able to spot. But you should know exactly what you changed in the converted sheet. Was there anything else you changed?

Werner_E

25-Diamond I

When I convert your worksheet to Prime I get an error, too.

As usual in Prime its an "unknown error: ode%

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ValeryOchkov

Author

24-Ruby IV

Thanks, Werner for the attention on the problem.

I have converted the file and a little edit it. See please the picture and the Prime 4 in attach.

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1_tulip.zip

V

ValeryOchkov

Author

24-Ruby IV

One simple example:

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Werner_E

25-Diamond I

Ah! A simpler example always is better! Even though the pictures are far too large, again!

So you should not only edit the converted Prime sheet to get the correct syntax for Prime's "odesolve" but also edit the Mathcad 15 sheet to get the correct MC15 syntax (the function name y is not used as argument of odesolve in real Mathcad) 😉

Unfortunately this simple example does not relate to your original file where it seems that you used the correct syntax. What did you change in Prime there to make it work (I am sure too lazy to compare myself). Did you change something else other than using real units, writing the derivatives using the prime symbols and adding the number of steps?

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Werner_E

25-Diamond I

*** DELETE ***

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-MFra-

21-Topaz II

Hi,

The system consists of four differential equations and six unknown functions. F1 and F2 are indefinite. Gravity acceleration was not dimensionless. Furthermore the conditions

should be respected.

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ValeryOchkov

Author

24-Ruby IV

@-MFra- wrote:

Hi,

The system consists of four differential equations and six unknown functions. F1 and F2 are indefinite. Gravity acceleration was not dimensionless. Furthermore the conditions

should be respected.