How can I get only the coefficients that are multiplied by the powers of x? Example: 5x^2 + 9x + 12y + 3z >>> [5, 9]

Hello

Let's say I have the following symbolic equation:

5x^2 + 9x + 5y + 3z

Is there a function that returns the coefficients that are multiplied by the powers of x.

Example:

SomeFunction(5x^2 + 9x + 12y + 3z , x) > [5 , 9]

SomeFunction(5x^2 + 9x + 12y + 3z , y) > [12]

SomeFunction(5x^2 + 9x + 12y + 3z , z) > [3]

Answer 1

[KSSV]

Read about coeffs

https://in.mathworks.com/help/symbolic/coeffs.html

Answer 2

[Steven Lord]

syms x y z
F = 5*x^2+9*x+5*y+3*z
[C, T] = coeffs(F, x)
C(logical(T ~= 1))

The logical call in the last line may look redundant, but it's necessary to convert (T ~= 1) from a symbolic expression to a logical expression.