Unable to run symbolic script, MATLAB is making fractions extremely large and unable to handle them

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Amit Kumar
Amit Kumar 2013-10-22
编辑： Amit Kumar 2013-10-30
Hi all,

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sixwwwwww
sixwwwwww 2013-10-22
编辑：sixwwwwww 2013-10-22
Dear Amit, here is the modified code:
tic
syms x1 x2 x3 a;
f = x1^2+2*x2^2+2*x3^2+2*x1*x2+2*x2*x3;
p=[1,1,1];
no = 10;
tol = 1e-4;
k = 1;
n = 1;
while(no>tol)
gr = [diff(f,x1),diff(f,x2),diff(f,x3)];
gr1 = double(subs(gr,[x1,x2,x3],p));
no = norm(gr1);
d = -1 * gr1;
f1=subs(f,[x1,x2,x3],p+a*d); %problem 1
b = double(solve(diff(f1,a)));
p = p+b*d;
k=k+1;
n=n+2;
t2 = double(subs(f1,[x1,x2,x3,a],[p,b])); %problem 2
fk(k)=t2;
end
disp(p)
toc
I hope it helps. Good luck!

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