I am trying to solve for input voltage in terms of one current (I3 in my case). I've used KVL to derive the equations, but beyond that I'm a bit lost. I looked around at MATLAB Answers and haven't found anything. When I solve my system, I get the following response: Vi = Empty sym: 0-by-1. What does that even mean?
syms I1 I2 I3 I4 Vi s
eqn1 = (2*s)*I1 +(-s)*I2 +(-2)*I4 - Vi==0;
eqn2 = (-s)*I1 +(2*s+1)*I2 + (-1)*I3==0;
eqn3 = (-1)*I2 + ((2/s)+1)*I3 +(-1/s)*I4==0;
eqn4 = (-s)*I1 + (-1/s)*I3 + (s+1/s)*I4==0;
Vi = solve(eqn1, eqn2, eqn3, eqn4, I3)
I've inserted by code above for reference. If anyone can provide a little guidance, that would be great. Thank you.