MATLAB出现?Subscript indices must either be real positive inte

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MATLAB出现?Subscript indices must either be real positive integers or logicals
clear all %a .m
Rh=input('请输入环半径,Rh=');
I0=input('请输入环电流,I0=');
mu0=4*pi*1e-7;
C0=mu0/(4*pi)*10; %归常数
Nh=20; %电流环分段数
x=linspace(-3,3,Nh);y=x; %确定观测点的范围
theta0=linspace(0,2*pi,Nh+1); %环的圆周角分段
thetal=theta0(1,Nh);
y1=Rh*cos(thetal); %环各段矢量的起点坐标y1,z1
z1=Rh*sin(thetal);
theta2=theta0(2:Nh+1);
y2=Rh*cos(theta2); %环各段矢量的终点坐标y2,z2
z2=Rh*sin(theta2);
xc=0;yc=(y2+y1)/2;zc=(z2+z1)/2; %计算环各段矢量中的点的坐标分量
dlx=0;dly=y2-y1;dlz=z2-z1; %计算环各段矢量d1的3个分量,x1=x2=0
NGx=Nh;NGy=NGx; %确定网格线数
for i=1:NGx
rx=x(j)-xc,ry=y(i)-yc,rz=0-zc; %计算矢径r的3个长度分量,P点z=0
r3=sqrt(rx.^2+ry.^2+rz.^2).^3; %计算r^3
dlXr_x=dly.*rz-dlz.*ry; %计算叉乘积dl×r的x和y分量,z分量为0
dlXr_y=dlz.*rx-dlx.*rz;
Bx(i,j)=sum(C0*dlXr_x./r3); %把环各段产生的磁场分量累加
By(i,j)=sum(C0*dlXr_y./r3);
B=(Bx.^2+By.^2).^0.5; %计算B的大小
end
subplot(1,2,1),quiver(x,y,Bx,By); %用quiver画磁场矢量图
xlabel('x'),ylabel('y')
axis([-3,3,-3,3])
subplot(1,2,2)
mesh(x,y,B); %画磁场大小分布图
xlabel('x'),ylabel('y'),zlabel('v')
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Subscript indices must either be real positive integers or logicals.
Error in ==> dianci at 19
rx=x(j)-xc,ry=y(i)-yc,rz=0-zc; %计算矢径r的3个长度分量,P点z=0
请问错在了那里?在十九行以下还出现什么错误了吗?

这个错误是说:
角标不能是正整数或逻辑变量
由于你的循环变量是i
而你下面的循环又用j
rx=x(j)-xc
这句应当是
rx=x(i)-xc %j改成i
再问：那23行 24行出现了什么错误？运行之后是同样的错误 ??? Subscript indices must either be real positive integers or logicals. Error in ==> dianci at 23 Bx(i,j)=sum(C0*dlXr_x./r3); %把环各段产生的磁场分量累加
再答：看来不是简单的打错字的问题. 你的代码好像漏掉了一个j的循环. 至于哪里漏了.现在很不好说. 你最好找一下原代码的出处.

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