newton.m

来自「Some methods Applied in matlab」· M 代码 · 共 17 行

function out=Newton(x0)
fprintf(' \t\t Newton method \n')
fprintf(' \tsteps\tx0\t\tf(x0)\n')
for i=1:5

    x1=x0-(f(x0)/s(x0));
    x0=x1;
fprintf('%8d  %8.4f%8.4f \n', i,x0,f(x0))
end %for

end %function
function ret=f(x)
ret=4*x.^2-3;
end
function prime=s(x)
prime=8*x;
end