How to extract a coefficient from a specific symbolic variable?

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Nathan Batta
Nathan Batta 2020-1-24
回答： Walter Roberson 2020-1-24
Hello all!
I am modeling a suspension system and I have 6 very long equations of motion that I need to convert to state space. To create the matrices for the state space, I need the coefficient of each of my state variables. Is there a good way to extract these variables?
I looked at coeffs but since I have an equation and not a polynomial I couldn't get it to work.
By using collect I am able to easily view the coefficient for one variable at a time but it is very tedious and doesn't output the coefficient - it just makes it easy for me to see.
I don't have a lot of experience with Matlab so hopefully this is an easy fix. Thank you!

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回答（1 个）

Walter Roberson
Walter Roberson 2020-1-24
Sometimes you can isolate() the variable in the equation, after which coeffs() the lhs() of the equation.
Otherwise, lhs(eqn)-rhs(eqn) and coeffs() that to get the coefficient for the variable.

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