4楼: Originally posted by 我要飞 at 2011-10-17 11:54:02:
??? function AA
    |
Error: Function definitions are not permitted at the prompt or in scripts.
你给的程序不对呀，出像上面这样的错呀

function AA
p=f(-1/2-sqrt(3)/2*i , -1/2+sqrt(3)/2*i, 1)


function p=f(A,B,C)
%>>p=f(-1/2-sqrt(3)/2*i , -1/2+sqrt(3)/2*i, 1)
h=0.01;
for a=-1:h:1
for b=-1:h:1
x0=a+b*i;
y=newton(x0);
if abs(y-A)<1.0e-6
plot(a,b,'r.');
hold on
elseif abs(y-B)<1.0e-6
plot(a,b,'g.');
hold on
elseif abs(y-C)<1.0e-6
plot(a,b,'y.');
hold on
end
end
end

p=0;


function y=newton(z)

if (z==0)
y=0;
return;
end

for i=1:1:2000
y=z-(z^3-1)/(3*z^2);
if(abs(y-z)<1.0e-7)
break;
end
z=y;
end