Special matrix with zeros and ones
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Hello Everyone,
I have a special matrix and can not create it in faster way
The example of a matrix is as follows:
m=[1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0;
0 0 0 0 1 1 1 1 0 0 0 0 0 0 0 0;
0 0 0 0 0 0 0 0 1 1 1 1 0 0 0 0;
0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1]
I can build it up by using ones and zeros, but it will take me a long time to do that, specially when I have a very big matrix.
Thanks in advance.
2 个评论
Jan
2015-3-6
I've formatted your code.
James Tursa
2015-3-6
It's going to take us even longer unless we know the pattern rules. Can you explain a bit more about what the pattern is for a "very big matrix"?
采纳的回答
Are you looking for kron?
kron(eye(4), ones(1, 4))
kron is not efficient. This might be faster, but less nice:
n = 4;
ind = repmat(n, 1, n*n-1);
ind(n:n:n*n-1) = n + 1;
M = zeros(n, n*n);
M(cumsum([1, ind])) = 1;
更多回答（2 个）
Rodney Buller
2015-3-6
1 个投票
Have you given this a try?
m=zero[4 16] m(1,1:4)=1; m(2,5:8)=1; m(3,9:12)=1; m(4,13:16)=1;
Assign a matrix as large as you need then, assigning values afterwards. variable(row,column)=assignment val
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