[MATLAB基础] matlab菜鸟问题

[cfyangyang]

初学,编了一小段，就…………

a=[0 1 0 0 1 0 0 1
1 0 1 0 0 0 0 1
0 1 0 1 0 1 0 0
0 0 1 0 1 0 1 0
1 0 0 1 0 1 0 0
0 0 1 0 1 0 1 0
0 0 0 1 0 1 0 1
1 1 0 0 0 0 1 0]
s(1,8) %建个1*8的数组
for i=1:5 %嵌套循环
b=a^i
for j=1:8
s(j)=s(j)+b(j,j)/factorial(j)
end
end

错误是Index exceeds matrix dimensions.
觉得没越界啊，请高手们赐教