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

Hi all,

[sixwwwwww]

how much time does MATLAB takes in each iteration on your computer?

[sixwwwwww]

Yes i made some modifications and program end in almost 48 seconds. But now i m running ur code and its not finished yet. I will post modified program shortly

Answer 1

[sixwwwwww]

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!

[sixwwwwww]

I am also learner of MATLAB. You are welcome