matlab如何生成一个有规律的矩阵

如何生成这样一个矩阵
【-1 0 +1 +1 0 0 -1 -1 -1 0 0 0 +1 +1 +1 +1 0 0 0 0后面一直按规律排下去 】

用递归

function a = fun(n)
if(n==1)
    a = [-1,0];
elseif(mod(n,2)==0)
    a = [fun(n-1),ones(1,n),zeros(1,n)];
else
    a = [fun(n-1),-ones(1,n),zeros(1,n)];
end
end

调用示例：

>> fun(3)

ans =

    -1     0     1     1     0     0    -1    -1    -1     0     0     0

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