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diff --git a/3432/DEPENDENCIES/acker_dk.sci b/3432/DEPENDENCIES/acker_dk.sci
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+//------------------------------------------------------------------
+//------------------------------------------------------------------
+//A function written by Deepti Khimani.
+//Usage:-
+//[K, lambda]=acker_dk(a, b, pl)
+//K=acker_dk(a, b, pl)
+//a:- System matrix.
+//b:- input matrix.
+//p:- Desired poles.
+//K:-State feedback gain for the control law u=-Kx.
+//lambda:- Eigen values of (a-b*k)
+//------------------------------------------------------------------
+//------------------------------------------------------------------
+
+function [K, lambda]=acker_dk(a, b, pl)
+        [lhs,rhs]=argn(0)
+
+    if rhs == 0 then
+        disp(["K=acker_dk(a, b, pl)";"[K, lambda]=acker_dk(a, b, pl)"]);
+        disp(["a:- System matrix";"b:- input matrix";"p:- Desired poles"]);
+        disp(["K:-State feedback gain for the control law u=-Kx";...
+ "lambda:- Eigen values of (a-b*k)"]);
+        return;
+    end
+[ra ca]=size(a);
+[rb cb]=size(b);
+l=length(pl);
+
+CO=cont_mat(a,b);
+
+if ra~=l then
+    error(["Dimension error:";"number of desired poles must equal...
+ to order of the system"]);
+elseif ra~=ca then
+    error(["Dimension error:";"system matrix should be...
+ a sqaure matrix"]);
+elseif rb~=ra then
+    error (["Dimension error:","Input matrix should have...
+ as many rows as a system matrix."]);
+elseif rank(CO)<ra then
+    error("system is not controllable");
+end
+//------------------------------------------------------------------
+//controllable canonical form
+[Ac,Bc,T,ind]=canon(a,b);
+
+//CO=zeros(ra,cb);
+for i=1:ra
+    CO(:,ra+1-i)=Ac^(i-1)*Bc;
+end
+//------------------------------------------------------------------
+chr_eq=poly(pl,'s');
+des_chr_coeff=coeff(chr_eq);
+
+des_chr_coeff=des_chr_coeff(1:ra);
+alpha_c=Ac^ra;
+
+for k=1:ra
+    alpha_c=alpha_c + des_chr_coeff(k)*Ac^(k-1)
+end
+//------------------------------------------------------------------
+//State feedback gain
+temp=zeros(1,ra);
+temp(1)=1;
+K=temp*inv(CO)*alpha_c;
+K=K/T;
+lambda=spec(a-b*K);
+endfunction
+//------------------------------------------------------------------
+
+
+
+