Who has faced such a problem, how can it be solved?
Project from below

Poverochnyjj raschjot ehzhektora.sm (84 KiB) downloaded 35 time(s).

Wrote

Who has faced such a problem, how can it be solved?

"result above max ..." has no pertinent meaning in your project.
If you attempt "roots" on the numerator only ... "Units don't match"
No need to go further ... zap the units in the project.

Wrote

Wrote

Who has faced such a problem, how can it be solved?

"result above max ..." has no pertinent meaning in your project.
If you attempt "roots" on the numerator only ... "Units don't match"
No need to go further ... zap the units in the project.

I made a mistake, there should be a solve function, in this place the same error

Wrote

I made a mistake, there should be a solve function, in this place the same error

Same answer: Units don't match.
How can you solve what you can't plot or evaluate ?

You can use the function FindRoot() from the Nonlinear Solvers plugin. The function automatically assigns the solution to the variables.

Единицы измерения здесь не при чем.

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You can use the function FindRoot() from the Nonlinear Solvers plugin. The function automatically assigns the solution to the variables.

Единицы измерения здесь не при чем.

why do you use 0.2 and 0.5?

Joki,
Martin could have drawn the two curves and graphically estimated the two solutions

sergio

Wrote

Martin could have drawn the two curves and graphically estimated the two solutions

sergio

The solution must be automatic, plotting make and evaluating it is not appropriate

Wrote

The solution must be automatic, plotting make and evaluating it is not appropriate

OK ... don't plot => find min/max.
Don't you need a road to drive the car from point A to point B ?

Wrote

Who has faced such a problem, how can it be solved?

Common from ill posed construction.
Consider yellow up until you can plot that system(x,y):= ....
from there it should be solvable.

Poverochnyjj raschjot ehzhektora [zap Units, define the Undefined ...].sm (94 KiB) downloaded 39 time(s).

Wrote

Wrote

Martin could have drawn the two curves and graphically estimated the two solutions

sergio

The solution must be automatic, plotting make and evaluating it is not appropriate

Go on dreaming. If you are in non-linear systems and you can't find a symbolic solution (Maxima's Solve() got stuck when I tried) then you need numerical procedures for solution. These always need an initial guess (Newton-Raphson) or a search region (bisection). The various procedures just differ in how efficient or how robust they are. Some of them may have quite impressive radii of convergence for particular systems but none has infinite radius for all systems.

Furthermore, there remains the problem of uniqueness of a solution. The only solvers in SMath capable of providing multiple solutions are the

• solve() finds all solutions of a single equation within a given range
  
• Solve() from the Maxima plugin, which finds symbolic solutions.
  

Blatt21.sm (5 KiB) downloaded 38 time(s).

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Furthermore, there remains the problem of uniqueness of a solution. The only solvers in SMath capable of providing multiple solutions are the

solve() finds all solutions of a single equation within a given range
Solve() from the Maxima plugin, which finds symbolic solutions.

Quite right and not enough wrt complex roots.

Cubic solver Exercise.sm (38 KiB) downloaded 43 time(s).

Always avoid ill posed polynomials.

To OP's original question. I did get the same/similar error message on linear interpolation. One of the 5 required values had wrong value. After correcting no issues.

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To OP's original question. I did get the same/similar error message on linear interpolation. One of the 5 required values had wrong value. After correcting no issues.

.
What linear interpolation is doing here ?
If that document makes sense, return with comments.

Poverochnyjj raschjot ehzhektora [solve].sm (95 KiB) downloaded 31 time(s).

Wrote

What linear interpolation is doing here ?
If that document makes sense, return with comments.

I imagine you mean the very last part of the document.
The system looks ill posed, visit Solve Lecture last 3 days.

Poverochnyjj raschjot ehzhektora [solve, spline].sm (104 KiB) downloaded 41 time(s).

... maybe we can leave it as such ... cleanup ?

Poverochnyjj raschjot ehzhektora [solve, spline].sm (110 KiB) downloaded 43 time(s).
Inst_Isentropic Discharge.sm (173 KiB) downloaded 41 time(s).