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DN_111230073-Newcomer
3-Newcomer
June 8, 2024
Solved

MathCad 13 vs MathCad 14 - a problem with a "solve" function

  • June 8, 2024
  • 4 replies
  • 3311 views

Hello everyone

 

I worked on MathCad 13 for years, but recently switched to MathCad 14.

Generally, both versions are very similar, but it turned out that I have a problem - MathCad 14 is not able to solve some equations using the "solve" function, which version 13 solved. After a few seconds of "struggle", an error message appears, as in the attached graphic.

In turn, in cases where version 14 solves equations created in version 13, it does it very slowly - in version 13 they were solved immediately after opening the file, and in version 14 you have to wait a long time, even about 10 seconds.

What is the problem and how to solve it?

I would like to mention that I cannot return to version 13, which I would like to do.

 

Thanks

Best answer by Werner_E

As Luc already wrote there was a change in the symbolic processor from Mathcad 13 to Mathcad 14.

And while I would say that MC14 is an improvment over MC13, this sure does not apply to symbolic operations. Maple as symbolic engine sure was the best engine Mathcad ever had and the successors (muPad since Mathcad 14 and FriCas/Axiom  since Prime 6) are clearly inferior to it.

 

Concerning the equation you try to solve we can say:

 

1) The symbolics seems to was improved over time. With the last version of Mathcad 15 (actually just a further maintenance release of MC14) I get

Werner_E_2-1717924435171.png

 

2) After you finally posted your worksheet it could be seen that all other variables in your equation are numerically defined - that means that you are just looking for a numeric solution, not a symbolic one! So there is no reason for using the symbolic "solve" command anyway.

You can use one of Mathcads numeric solvers. These basically are the "root" function (can be used in two ways) or a solve block with "find":

 

Werner_E_1-1717924106669.png

 

Mathcad 15 sheet attached, You should have no problems opening it with MC14.
The symbolic "solve" possibly still will fail in your version, but I expect that the numeric methods will work OK.

 

4 replies

L
LucMeekes23-Emerald IV
23-Emerald IV
June 8, 2024

The symbolic processor in Mathcad 13 is Maple. In Mathcad 14 it is Mupad. There is quite some difference between these two in terms of what they can solve and how the output is presented.

 

Note that neither of the two versions is supported anymore.

 

Success!

Luc

D
DN_111230073-NewcomerAuthor
3-Newcomer
June 8, 2024

So, does it mean that version 14 is worse than version 13, to put it simply?

In my case the calculations take much longer or fail at all...

And the question from my previous post remains - how to solve that specific problem, concerning this equation shown before?

A
AlfredFlaßhaar15-Moonstone
15-Moonstone
June 8, 2024

Please send a file *.mcd or *.xmcd instead of *.jpg.

D
DN_111230073-NewcomerAuthor
3-Newcomer
June 8, 2024

Here it is.

A
AlfredFlaßhaar15-Moonstone
15-Moonstone
June 9, 2024

Even under the obviously necessary condition phi >0, no convergence occurs. Therefore, in MC14, I was left with only the attached solution.

W
Werner_E25-Diamond IAnswer
25-Diamond I
June 9, 2024

As Luc already wrote there was a change in the symbolic processor from Mathcad 13 to Mathcad 14.

And while I would say that MC14 is an improvment over MC13, this sure does not apply to symbolic operations. Maple as symbolic engine sure was the best engine Mathcad ever had and the successors (muPad since Mathcad 14 and FriCas/Axiom  since Prime 6) are clearly inferior to it.

 

Concerning the equation you try to solve we can say:

 

1) The symbolics seems to was improved over time. With the last version of Mathcad 15 (actually just a further maintenance release of MC14) I get

Werner_E_2-1717924435171.png

 

2) After you finally posted your worksheet it could be seen that all other variables in your equation are numerically defined - that means that you are just looking for a numeric solution, not a symbolic one! So there is no reason for using the symbolic "solve" command anyway.

You can use one of Mathcads numeric solvers. These basically are the "root" function (can be used in two ways) or a solve block with "find":

 

Werner_E_1-1717924106669.png

 

Mathcad 15 sheet attached, You should have no problems opening it with MC14.
The symbolic "solve" possibly still will fail in your version, but I expect that the numeric methods will work OK.

 

V
vnamboodheriCommunity Manager
Community Moderator
June 14, 2024

Hello @DN_11123007, 

 

It looks like you have some responses from some community members. If any of these replies helped you solve your question please mark the appropriate reply as the Accepted Solution. 

Of course, if you have more to share on your issue, please let the Community know so other community members can continue to help you.

Thanks,
Community Moderation Team.

D
DN_111230073-NewcomerAuthor
3-Newcomer
June 14, 2024

Thanks guys for all the answers.

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