Hello All,
I have four unknowns in three linear equations. In this setup, can the FindRoot function get values for these variables?
I tried the same in MathCAD and could get the solution, but it is not working in Smath.
Can someone guide me, please?
Are there other possible solving methods for handling such equations with 6 or 8 unknowns?
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Best Regards
Saviind

Usually al_nleqsolve() is more capable at this kind of situations.
Also your functions shouldn't have boolean operations.

Regards

Solve() from the Maxima plugin can handle under-determined systems of equations. In such cases, the solution contains a free variable. The name changes every time the sheet is recalculated. If you want to rely on that name, insert a MaximaControl("restart" ) command to reset the Maxima session and the counter.


Trial_Kr.sm (41,8 KiB) scaricato 1791 volta(e).

Wrote

... I tried the same in MathCAD and could get the solution, but it is not working in Smath....

Hi. Can you share the Mathcad result? This page is the help for matlab techniques for handling underdetermined systems: https://www.mathworks.com/help/matlab/math/systems-of-linear-equations.html#bt7ov7u

Writing the system as a linear one, SMath have some functions for work with those systems, like this one



Trial.sm (61,84 KiB) scaricato 1682 volta(e).

Best regards.
Alvaro.

For your f(x,y,z) ... I get two sets of solved [x,y,z].
Smath solves the Mathsoft example, 4 unknowns.
Smath Butller is lot more advanced/difficult.
Jean.

Solve FindRoot f(x,y,z) ITERATIVE.sm (103,87 KiB) scaricato 1835 volta(e).