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5-Regular Member

## Solve System of n equations

Hello Everybody,

i have a question about Mathcad 14. How can i solve a System of n equations that has all equations in the same form like

Equation i: Q_i = k_i*A_i*DT ....

when DT is a constant, all Q_i and k_i are given.

How can i do this directly? I dont want to write all equations down, coz i want to keep the number of equations as a variable.

Thanks

Lert

1 ACCEPTED SOLUTION

Accepted Solutions
23-Emerald I
(To:LertPianapitham)

Solve blocks are amazing things!

9 REPLIES 9
23-Emerald I
(To:LertPianapitham)

done

3-Visitor
(To:Fred_Kohlhepp)

Added a function format to Fred's

23-Emerald I
(To:wayne)
 Wayne Reid wrote:Added a function format to Fred's

I thought the idea was to solve for A_i. You can still do what you were doing, just write a different function.

5-Regular Member
(To:LertPianapitham)

Hi all,

Thx for ur answers. i'm in vacation and will check the files next week.... actually i have another system that's more complicated .... looks like

Equations i:

Q_i = k_i*A_i*DT_i

DT_i = ((T_S - T_E) - (T_S - T_A_i)) / (ln(T_S - T_E) - ln(T_S - T_A_i))

T_A_i = T_E + (Q_i * Sum(A_i)) / (m_K * A_i * C_p)

the Q_i and k_i are given. the T_S, T_E, m_K and C_p are constant. that means ... we have only A_i, DT_i and T_A_i as variables ( 3n Equations ... 3n Variables)

can i use ur technics in those files or how can i do this?

Thx again for both of u.

Lert

Ps. if u cannot understand this, i will create a file next week.

 Lert Pianapitham wrote:Hi all,Thx for ur answers. i'm in vacation and will check the files next week.... actually i have another system that's more complicated .... looks likeEquations i: Q_i = k_i*A_i*DT_i DT_i = ((T_S - T_E) - (T_S - T_A_i)) / (ln(T_S - T_E) - ln(T_S - T_A_i)) T_A_i = T_E + (Q_i * Sum(A_i)) / (m_K * A_i * C_p)the Q_i and k_i are given. the T_S, T_E, m_K and C_p are constant. that means ... we have only A_i, DT_i and T_A_i as variables ( 3n Equations ... 3n Variables)can i use ur technics in those files or how can i do this?Thx again for both of u.LertPs. if u cannot understand this, i will create a file next week.

Send please this equations as a Mathcad-sheet.

3-Visitor
(To:ValeryOchkov)

Hello! I am struggling with solve blocks in MathCAD, trying to make Given-Find too, not working for my equations.

Could you explain how it is working and how I can find solution to my problem?

I have 3 equations, 2 of them have 1 variable each(x and y), 3rd equation is for help...

See attached worksheet.

Many Thanks and Regards,

Aidan

23-Emerald I
(To:akazimli)

I'm not sure what's stopping your solve block; but your three constraints are actually two independent equations--you don't need a solve block

23-Emerald I
(To:LertPianapitham)

Solve blocks are amazing things!

5-Regular Member
(To:LertPianapitham)

Thx. very much .... it's very useful!

Lert

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