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diff --git a/2048/DEPENDENCIES/tfvar.sci b/2048/DEPENDENCIES/tfvar.sci
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+// Cancellation of common factors and determination of covariance
+// 11.7
+
+// function [N,dN,D,dD,yvar] = tfvar(N,dN,D,dD)
+// N and D polynomials in z^{-1} form; discrete case
+
+function [N,dN,D,dD,yvar] = tfvar(N,dN,D,dD)
+
+[N,dN,D,dD] = l2r(N,dN,D,dD);
+N = N/D(1); D = D/D(1);
+LN = length(N); LD = length(D); 
+D1 = D;
+if LD<LN, D1 = [D zeros(1,LN-LD)]; dD1 = dD+LN-LD; end
+H = tf(N,D1,1);//TS=1 (sampling time) has been taken constant in tfvar
+yvar = covar_m(H,1); 
+endfunction;