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A
AN_104977451-Visitor
1-Visitor
November 21, 2022
Question

Equations cannot be solved in Prime version, in Mathcad 14 it still works.

  • November 21, 2022
  • 2 replies
  • 3442 views

Hi all,

I need your help.

I have an old calculation, which was made in Mathcad 14. This calculation was made not by me.

This calculation perfectly works in Mathcad 14. Now we have Mathcad Prime 7 and 8.

I have converted this calculation to  *.mcdx format. And I got a problem.

The equations, which calculated using Euler method, cannot be calculated now in Prime 7 and 8 with step  5000 and more.

It show me error “ infinite recursion or overflow”.

With step 4700 it still works. Attached you can find this equations. 

Thanks in advance.

2 replies

V
24-Ruby III
VladimirN24-Ruby III
24-Ruby III
November 21, 2022

 Hi,

 

Can you also attach the source file for Mathcad 14?

A
AN_104977451-VisitorAuthor
1-Visitor
November 22, 2022

Hi. I can do it  only tomorrow. 

W
Werner_E25-Diamond I
25-Diamond I
November 21, 2022

I could only test with Prime 6 and I experience no problems with a larger range tau.

I could setup tau with over 5 millions steps without any error.

So either there is a problem with your installation of Prime or once again Prime was "developed" in the wrong direction. Maybe someone with P7 or P8 can testdrive your sheet and report the results.

Here a screenshot of P6:

Werner_E_0-1669058677438.png

 

L
LucMeekes23-Emerald IV
23-Emerald IV
November 21, 2022

Doesn't run that far in Prime 8.

I can set tau up to 4764 without error, at 4765 the expression H2(B1[tau) is flagged with an error. Prime 7 is the same.

Translated down to Prime 4 (express) and it runs easily up to tau=50000:

LucMeekes_0-1669068889287.png

I think it's official. PTC broke something between Prime 6 and 7.

 

Success!

Luc

 

 

W
Werner_E25-Diamond I
25-Diamond I
November 22, 2022

I think it's official. PTC broke something between Prime 6 and 7.

I already suspected exactly that.

 

@AN_10497745 

You may consider reporting that bug and opening a support case if you have the least hope that it would have any positive effect.

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