Hi
I am assuming you want to solve the equation
d = solve(eq1==Th1,eq2==Th2,eq2==Th3,eq2==Th4,Rs,Ld,Lq,kexi);
You can try using the "solve" function in the Symbolic Math Toolbox with the Parameter "ReturnConditions" set to true as below:
d = solve([eq1==Th1,eq2==Th2,eq2==Th3,eq2==Th4],[Rs,Ld,Lq,kexi],'ReturnConditions',true);
which gives
>> d
d =
struct with fields:
Rs: [3×1 sym]
Ld: [3×1 sym]
Lq: [3×1 sym]
kexi: [3×1 sym]
parameters: [1×4 sym]
conditions: [3×1 sym]
where the parameters used in the solutions and the conditions under which the respective solutions are valid are stored in the struct "d" under the fields "parameters" and "conditions" respectively.
I noticed that
d = solve([eq1==Th1,eq2==Th2,eq3==Th3,eq4==Th4],[Rs,Ld,Lq,kexi]);
seems to give a unique solution if that was what you wanted to actually solve.
You can refer the documentation for "solve" for more information:
Hope this helps
