solving an equation in MATLAB

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KeJoSa
KeJoSa 2012-11-3
Hi,
I am trying to solve the following equation for q in MATLAB, however, I get a message saying q is not defined.
solve(z1*(K1-1)/(q*(K1-1)+1)+z2*(K2-1)/(q*(K2-1)+1)+z3*(K3-1)/(q*(K3-1)+1)==0,q)

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采纳的回答

Matt Fig
Matt Fig 2012-11-3
S = solve('z1*(K1-1)/(q*(K1-1)+1)+z2*(K2-1)/(q*(K2-1)+1)+z3*(K3-1)/(q*(K3-1)+1)','q')

更多回答（2 个）

KeJoSa
KeJoSa 2012-11-3
Thanks Matt!
Walter Roberson
Walter Roberson 2012-11-3
No, the key is to add
syms q
before the call.
Also, as you are not using R2012a or later, you cannot use == in solve(). As you are comparing to 0 anyhow, just leave that part out:
solve(z1*(K1-1)/(q*(K1-1)+1)+z2*(K2-1)/(q*(K2-1)+1)+z3*(K3-1)/(q*(K3-1)+1),q)
  1 个评论
Matt Fig
Matt Fig 2012-11-3
What do you mean, 'No' Walter? The above code works fine on my system....

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