[eqns,vars] = getEqns(varargin{:}); problem with solve function

syms id iq f ecd ecq v0 s xd xl xad xq xf rf ra r idd iqd fd wb w
solve('-(xd+xl)*idd+xad*fd=wb*((ra+r)*id-xl*iq-w*xq*iq+ecd+v0*sin(s)','xad*idd+xf*fd=wb*(rf*efd/xad-rf*f)',idd,fd)

I am new to MATLAB.

i want the solution for idd and fd in terms of other variables, what is wrong in the above code?

Also, can solve be used for non linear equations??

Answer 1

[Walter Roberson]

The part that starts

((ra+r)

the first of those two ( has no matching )

Solve can be used for non-linear equations, but frequently the answer is written in terms of RootOf() something with the something not having a closed-form solution known to MuPAD. In the case of your equations, above, the expressions are linear in those variables so there is no problem.