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diff --git a/2048/DEPENDENCIES/gpc_col.sci b/2048/DEPENDENCIES/gpc_col.sci
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+// Calculates the GPC law given by Eq. 12.36 on page 446.
+// 12.6
+
+function [K,KH1,KH2,Tc,dTc,Sc,dSc,R1,dR1] = ...
+gpc_col(A,dA,B,dB,C,dC,N,k,rho)
+D=[1 -1]; dD = 0; AD=convol(A,D); dAD=dA+1; zj=1; dzj=0; 
+Nu = N+1; G=zeros(Nu,Nu); H1=zeros(Nu,2*k+N-2+dB); 
+H2 = zeros(Nu,k+N+dA);
+for j = 1:Nu,
+    zj = convol(zj,[0,1]); dzj = dzj + 1;
+    [Fj,dFj,Ej,dEj] = ...
+        xdync(zj,dzj,AD,dAD,C,dC);
+    [Nj,dNj,Mj,dMj] = ...
+        xdync(zj,dzj,C,dC,1,0);
+    [Gj,dGj] = polmul(Mj,dMj,Ej,dEj);
+    [Gj,dGj] = polmul(Gj,dGj,B,dB);
+    [Pj,dPj] = polmul(Mj,dMj,Fj,dFj);
+    [Pj,dPj] = poladd(Nj,dNj,Pj,dPj);
+    j,Fj,Ej,Mj,Nj,Gj,Pj
+    G(j,1:j) = flip(Gj(1:j));
+    H1(j,1:dGj-j+1) = Gj(j+1:dGj+1); 
+    H2(j,1:dPj+1) = Pj;
+end
+K = inv(G'*G+rho*eye(Nu,Nu))*G'
+// Note: inverse need not be calculated
+KH1 = K * H1; KH2 = K * H2;
+R1 = [1 KH1(1,:)]; dR1 = length(R1)-1;
+Sc = KH2(1,:); dSc = length(Sc)-1;
+Tc = K(1,:); dTc = length(Tc)-1;
+endfunction;