cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
Showing results for 
Search instead for 
Did you mean: 

Community Tip - Need help navigating or using the PTC Community? Contact the community team. X

Mathcad 7 returns wrong result

CM_8363623
2-Guest

Mathcad 7 returns wrong result

Hi,

 

the "solution" shown below is obviously wrong. Any help is appreciated!

 

Mathcad7_wrong.png

3 REPLIES 3
LucMeekes
23-Emerald III
(To:CM_8363623)

I agree, the symbolic solver should tell you:

LucMeekes_0-1638471094848.png

where the error message is: "No solution was found".

On the other hand:

LucMeekes_1-1638471162651.png

That's pretty close to 0... I guess the real answer is only found from the other side:

LucMeekes_2-1638471278588.png

The problem is similar to:

LucMeekes_3-1638471379413.png

I must admit that the numeric processor does slightly better:

LucMeekes_4-1638471650665.png

But it fails to recognise an answer that's close to the limit:

LucMeekes_5-1638471769839.png

 

Success!

Luc

 

Mathcad 15 M050:

Pic-2.png

 

Mathcad Prime 3.1:

Pic-1.png

Nobody is perfect and symbolic calculations are not the main arguments for using Prime. For symbolics you may have a look at Maple or Mathematica (or even MatLab with a more powerful muPad under the hood).
Primes legacy symbolic sometimes (quite often) outrules the new one

Werner_E_0-1638474593412.png

but not always:

Werner_E_1-1638474924253.png

but OK, 204.50 at least is closer to infinite that 33.58 🙂

 

 

Top Tags