$\begingroup$I'm trying to solve this system equations in matlab
syms y z i x=[29.6,29.4,34.4,35.1,34.3,36.1,31.6,32.9,31.5,28.3,37.1,28.4,27.3,33.1,31.3,33.1] n = 16 eqns = sym(zeros(1, 2 * n)); for i = 1:n a = 0; for j = 1:i a = a + exp(-((x(j) - y) / z)); end a = i/z - a/z; eqns(i) = a == 0; end for i = 1:n a = 0; for j = 1:i a = a + ((x(j) - y)/z^2) - ((x(i) - y)/z^2) * exp((-x(j) + y)/z); end a = -i/z + a; eqns(i + 16) = a == 0; end eqns solve(eqns, [y, z]) But it seems solve can't solve this one.
Warning: Cannot find explicit solution. > In solve (line 316) In xx (line 24) I tried to use fslove but by follow the tutorial at
but when I tried to enter
function F = root2d(x) F(1) = exp(-exp(-(x(1)+x(2)))) - x(2)*(1+x(1)^2); F(2) = x(1)*cos(x(2)) + x(2)*sin(x(1)) - 0.5; matlab throw error.
Can someone please help me?
Thank you.
P/S: Can this problem be solved with singular?I'm trying to solve this system equations in matlab
$\endgroup$11 Answer
$\begingroup$It's not clear what the problem is without being given the error, but:
F=@(x) [exp(-exp(-(x(1)+x(2)))) - x(2)*(1+x(1)^2);x(1)*cos(x(2)) + x(2)*sin(x(1)) - 0.5]; x0=[1;1]; fsolve(F,x0) worked for me. You can do this using "function F = ..." syntax, but then you need to write @F in the call to fsolve.
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