# Display of result in tabular form

조회 수: 3 (최근 30일)
chuksjnr . 2016년 9월 6일
답변: Steven Lord . 2016년 9월 6일
Good morning friends, Am trying to solve an unconstrained optimization problem using (trust region) dogleg method. Below is a program i wrote for the problem, please i need help on how to make the results be in a tabular form under their respective headings and also plotting the trust region radius at each point. My program; clear all syms x1 x2 X = [x1 ; x2]; f = (x2 - 0.129*x1^2 + 1.6*x1 - 6)^2 + 6.07*cos(x1) + 10; w = jacobian(f,X); g1 = w'; h1 = jacobian(jacobian(f,X)); k = 0; x1 = 6; x2 = 14; I = 2.0; M = 5.0; B = 0.25; C = 2.0; lambda = 0.01; g = eval(g1); h = eval(h1); b = norm(g); while k<20 [V,D] = eig(h); [m,n] = size(h); d = diag(D); dmin = min(d); for i=1:m subh=h(1:i,1:i); if (det(subh)>0) H = h; else H = h + eye(size(h))*(lambda-dmin); end end Y = inv(H); r = (g'*g)/(g'*H*g); pU = -r*g; pB = -Y*g; if 0<=r<=1 P = r*pU; elseif 1<=r<=2 P = pU + (r-1)*(pB-pU); end PP = norm(P); b = norm(g); %where b is tol
f = @(x1,x2) (x2-0.129*x1^2+1.6*x1-6)^2+6.07*cos(x1)+10;
X = [x1;x2];
f0 = f(x1,x2);
W = g'*P;
Z = 0.5*(P'*H*P);
y = f0+W+Z;
v = f0;
A = X+P;
x1 = A(1,1);
x2 = A(2,1);
q = f(x1,x2);
Q = 0.2; R = 0.25; S = 0.75;
e = (f0 - q)/(v - y);
if e<R
Inew = B*I;
elseif e>S && PP==I
Inew = min(C*I,M);
else
Inew = I;
end
if e>Q
Xnew = A;
else
Xnew = X;
end
disp( [k' f0' x1' x2' e' I' P' b' PP'] )
Xnew = subs(Xnew);
k = k+1;
X = Xnew;
x1 = X(1,1);
x2 = X(2,1);
gnew = eval(g1);
b = norm(gnew);
hnew = eval(h1);
I = Inew; g = gnew;
[Vnew,Dnew] = eig(hnew);
[mnew,nnew] = size(hnew);
dnew = diag(Dnew);
dnewmin = min(dnew);
for i=1:mnew
subhnew=hnew(1:i,1:i);
if (det(subhnew)>0)
Hnew = hnew;
else
Hnew = hnew + eye(size(hnew))*(lambda-dnewmin);
end
end
Ynew = inv(Hnew);
rnew = (gnew'*gnew)/(gnew'*Hnew*gnew);
pUnew = -rnew*gnew;
pBnew = -Ynew*gnew;
if 0<=rnew<=1
Pnew = rnew*pUnew;
elseif 1<=rnew<=2
Pnew = pUnew + (rnew-1)*(pBnew-pUnew);
end
PPnew = norm(Pnew);
bnew = norm(gnew);
V = Vnew; D = Dnew; h = hnew; m = mnew; n = nnew; d = dnew; H = Hnew;
Y = Ynew; r = rnew; pU = pUnew; pB = pBnew; PP = PPnew; P = Pnew;
end
Thanks you as i await your kind help, inputs and corrections.

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### 답변 (1개)

Steven Lord 2016년 9월 6일
Create a table and add to it during each iteration.

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