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C
Cornel19-Tanzanite
19-Tanzanite
August 3, 2023
Question

Why Mathcad does not want to show all solutions of an equation?

  • August 3, 2023
  • 5 replies
  • 7636 views

Hello,

Cornel_0-1691045451146.png


But also we can see that if:

Cornel_1-1691045521404.png

 

Cornel_2-1691045538380.png

 

Why Mathcad (at least Prime 8 ) does not want to show all solutions of an equation?

 

5 replies

C
Cornel19-TanzaniteAuthor
19-Tanzanite
August 3, 2023

Another example:

Cornel_0-1691046600689.png

Cornel_3-1691046687247.png

L
LucMeekes23-Emerald IV
23-Emerald IV
August 3, 2023

Have you tried using the modifier ALL.  ?

 

Success!

Luc

C
Cornel19-TanzaniteAuthor
19-Tanzanite
August 3, 2023

 

Cornel_2-1691047690971.png

Cornel_3-1691047701422.png

Cornel_4-1691047707989.png

Cornel_5-1691047732731.png

Cornel_8-1691047800255.png

 

 

 

Cornel_0-1691047631073.png

Cornel_1-1691047637811.png

Cornel_6-1691047749641.png

 

Cornel_7-1691047764627.png

Cornel_9-1691047807863.png

 

ttokoro
21-Topaz I
ttokoro21-Topaz I
21-Topaz I
August 3, 2023

image.pngWe also have imaginary answers.

t.t.
C
Cornel19-TanzaniteAuthor
19-Tanzanite
August 3, 2023

But how you got these results? Can you upload a Mathcad file or some images with the entire solution?

C
Cornel19-TanzaniteAuthor
19-Tanzanite
August 3, 2023

@ttokoro @LucMeekes 
Another example:

Cornel_1-1691048073566.png

Cornel_2-1691048086499.png

M
MartinHanak24-Ruby III
24-Ruby III
August 3, 2023

Hi,

it would be nice if you send your questions to PTC Support, too. It's always good to ask directly at the source...

C
Cornel19-TanzaniteAuthor
19-Tanzanite
August 3, 2023

What is the procedure for this?

M
MartinHanak24-Ruby III
24-Ruby III
August 3, 2023
@Cornel wrote:

What is the procedure for this?

Hi,

you can access PTC Support only in case that you own commercial license of PTC product. Also your PTC account must be joined to PTC Customer item assigned to your company.

 

 

W
Werner_E25-Diamond I
25-Diamond I
August 3, 2023

The modifier you may be looking for is "fully"

Werner_E_0-1691057120141.png

As you can see the new (since Prime 6) symbolics is pretty faulty as _z2 and _z should be the very same!!

 

The older symbolic (which is still available in Prime 6 ) is a bit better

Werner_E_1-1691057241623.png

It means that you can freely chose y (=_z1) and z (=_z) and you get two valid solutions for x.

Of course this is the very same you could get with

Werner_E_2-1691057359361.png

And don't ask for integer only solutions - Prime will not be able to solve diophantic equations. Using the modifier assume, ALL=integer" or the like will not help!

 

You second equation is too much for Prime

Werner_E_3-1691057658139.png

but you may use

Werner_E_4-1691057680445.png

which seems to give you for any value x an infinite number of (usually non-real) solutions for y, depending on the chosen value of _n.

 

BTW, you ask a myriad of "Why... " and "How to ..." question but you tend to not come back timely to comment on the answers given and close the threads. Looks like you have at least five parallel  threads still not closed.

 

 

 

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