MATLAB: Is MATLAB “solve” not finding a solution

Question

Hello,

I have a system of equations:

-id = 0

qd/(C*L) – (Vs – R*id)/L = 0

I'm trying to solve this system of equations for id and Vs using the MATLAB solve function. After defining all variables as syms, I'm using the below code

Equations = [-id ; qd/(C*L) – (Vs – R*id)/L]

Solution = solve(Equations==0,id,Vs)

However, this is producing a warning, "Explicit solution could not be found." Why isn't MATLAB able to find a solution here?

There is a solution (id = 0, Vs = qd/C) which can be easily solved by hand.

Thank you,

Kevin

Answer 1

Potentially it is a clash with a MuPAD name. See http://www.mathworks.com/help/symbolic/mupad_ref/id.html