How to get coefficients of equation defined by symbolic variable equation.?

I have number of symbolic variable defined by as follow:

% a1, a2, a3, a4, a5

a = sym('a',[1 5]);

Now I have an equation.. eqn = 3*a1 - 6*a3 + 9*a5 == 45;

I want to separate all the coefficients of above equation and store in 1*5 matrix.

I also want to store constant (=45) into another vector.

Answer 1

[Walter Roberson]

[A,B] = equationsToMatrix(eqn,a)

A will be the coefficients and B will be what it equals