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How to extract a coefficient from a specific symbolic variable?

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Nathan Batta
Nathan Batta on 24 Jan 2020
Answered: Walter Roberson on 24 Jan 2020
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!

Answers (1)

Walter Roberson
Walter Roberson on 24 Jan 2020
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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