How I can get coefficients matrix from the set of linear equations?

Hello,

I am having problem in extraction of coefficients out of my set of symbolic linear equations. Equations are as such

R =

[0.8978*c - 0.8047*b - 0.020299*a,  0.8978*d - 0.094800*b - 0.106799*a]
[ 0.091199*a + 0.13200*c - 0.8047*d, 0.091199*b - 0.106799*c + 0.0575*d]

How I can get the coefficient matrix, that is my result will look like

R_coeff =

     -0.0203   -0.8047    0.8978         0
     -0.1068   -0.0948         0    0.8978
      0.0912         0    0.1320   -0.8047
           0    0.0912   -0.1068    0.0575

Thanks

Answer 1

[Walter Roberson]

coeffs

You might be able to vectorize this over R; I do not have the toolbox to test with.

All_Vars = symvar(R);
R_Trans = R.';

for J = 1 : numel(R_Trans)
  This_R = R_Trans(J);
  for K = 1 : length(All_Vars)
    Coeff_For_This_var = coeffs(This_R, This_Var(K));
    R_coeff(J, K) = Coeff_For_This_var(2);  %var^1
  end
end

The transpose is in order to get R(1,2)'s coefficients to appear before R(2,1)

[SMK]

Isn't there any command for such basic thing?