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Feb 02, 2012
05:32 PM

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Feb 02, 2012
05:32 PM

Expanding equations in Solve block turns values to 0

I have (6) equations with (6) unknowns that I have in a solve block. In addition to showing the equations I am using, I have to show the equation with the known values shown

For example, the fourth equation is:

(V.S2) = (I.2) * (Z.L2)

I have put the variables in parenthesis to indicate the entire name for the purpose of the discussion.

The variables (V.S2) and (Z.L2) are already pre-defined. I would like to show the same equation next to the first euqation with the values of (V.S2) and (Z.L2) shown. When I try using the "simplify" or "expand" or "-->" next to the equation, the values in my results change to 0.

I have attached the Mathcad file. Going into the solve block and trying to expand the equation will cause the values in my results to change to zero. Can someone please provide some guidance? Thank you.

12 REPLIES 12

Feb 03, 2012
12:31 AM

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Feb 03, 2012
12:31 AM

Sorry, the symbol math of Mathcad does not know units - ohm, V, deg.

See the attach

Feb 03, 2012
02:08 AM

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Feb 03, 2012
02:08 AM

Valery nothing attached.

Mike

Feb 03, 2012
02:09 AM

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Feb 03, 2012
02:09 AM

As Valery indicated the symbolic engine doesn't deal with units, see the attached is of help.

Mike

Feb 03, 2012
02:40 AM

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Feb 03, 2012
02:41 AM

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Feb 03, 2012
02:41 AM

Again Valery, nothing is being attached.

Mike

Feb 03, 2012
02:48 AM

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Feb 03, 2012
02:48 AM

1. Now in Mathcad Prime we can have in one vector volt and ampere

2. It is a system of LINEAR Equations and we can use the lsolve function

Feb 03, 2012
01:23 PM

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Feb 03, 2012
01:23 PM

@ Mike: If the variables did not have units, could I use the symbolic engine to expand on the equations?

@ Valery: In Mathcad Prime, would the Isolve function allow me to work with units and expand the equations?

Thanks in advance.

Feb 03, 2012
01:39 PM

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Feb 03, 2012
01:39 PM

@ Mike: If the variables did not have units, could I use the symbolic engine to expand on the equations?

You can tell to symbolic Math of Mathcad that V =A*ohm

@ Valery: In Mathcad Prime, would the Isolve function allow me to work with units and expand the equations?

Thanks in advance.

The Isolve function of regular Mathcad allow you to work with units of one dimentions.

The Isolve function of Mathcad Prime allow you to work with units of different dimentions.

Feb 04, 2012
09:27 PM

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Feb 04, 2012
09:27 PM

Do you mean this?

Because if this is what you mean, I don't see the 0's.

Feb 05, 2012
12:17 AM

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Feb 05, 2012
12:17 AM

May be so:

Feb 05, 2012
12:41 AM

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Feb 05, 2012
12:41 AM

This is **one**** of the few tasks **where **Mathcad Prime **has a distinct **advantage**** **over traditional Mathcad: the solving by the help of the lsolve function or by the help of the operator A^(-1)*v a system of linear equation A*x=v where arrays A, v and x have elements with different dimensions - Potential and Current!

Feb 08, 2012
02:56 AM

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Feb 08, 2012
02:56 AM

oneof the few taskswhereMathcad Primehas a distinctadvantageover traditional Mathcad: the solving by the help of the lsolve function or by the help of the operator A^(-1)*v a system of linear equation A*x=v where arrays A, v and x have elements with different dimensions - Potential and Current!

Massive, massive improvement IMO.

Mike