Question

关于matlab

哪位matlab高手给做下这道题啊

已知某非线性方程组如下：
ff(1)=(3-5*x(1))*x(1)+1-2*x(2)＝0
for k=2:9
ff(k)=(3-5*x(k))*x(k)+1-x(k-1)-2*x(k+1)＝0
end
ff(10)=(3-5*x(10))*x(10)+1-x(9)＝0

试求该方程组的解。

我用的是7.0的

Answer 1

function hh
x0=zeros(1,10);
[x,fval,exitflag]=fsolve(@myfun,x0)
function ff=myfun(x)
ff(1)=(3-5*x(1))*x(1)+1-2*x(2);
for k=2:9
ff(k)=(3-5*x(k))*x(k)+1-x(k-1)-2*x(k+1);
end
ff(10)=(3-5*x(10))*x(10)+1-x(9);

结果：
Optimization terminated: first-order optimality is less than options.TolFun.

x =

-0.3821 -0.4381 -0.4459 -0.4470 -0.4470 -0.4464 -0.4441 -0.4362 -0.4079 -0.3096

fval =

1.0e-013 *

0 0.0033 0.0033 0.0044 0.0056 -0.0100 -0.1721 -0.8105 -0.4763 -0.0078

exitflag =

1

Answer 2