How do I create a 2D sparse matrix?
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Hallo, When I want to creat a sparse matrix, and and according to the i verctor( index) the element must be equal =1
say i=[6 12 18 24 19 13 7 1]; A=sparse(i,i,ones(1,8)); then I have A =
(1,1) 1
(6,6) 1
(7,7) 1
(12,12) 1
(13,13) 1
(18,18) 1
(19,19) 1
(24,24) 1
Now:I want to creat a A 2D sparse matrix with vector i, but with every element are a 2D matrix 3x3 for exmaple A(1,1) is 2D matrix of dimension 3x3=[1 0 0;0 1 0; 0 0 1]; thank you in advance
1 个评论
Bruno Luong
2011-2-10
A (sparse) matrix can contain numerical elements and nothing else. What exactly you want to do?
采纳的回答
Marwa Helemish
2011-2-10
0 个投票
1 个评论
Andrew Newell
2011-2-10
Then what do you mean? I suggest editing your original question to clarify it.
更多回答（2 个）
Andrew Newell
2011-2-8
Here is how you would do it for your example:
N = 6; % I assume this is a square matrix?
A = zeros(3,3,N^2);
A3 = eye(3);
indexList = [6 12 18 24 19 13 7 1];
for i=indexList
A(:,:,i) = A3;
end
A = num2cell(A,[1 2]);
A = reshape(A,N,N);
A = sparse(cell2mat(A));
2 个评论
Todd Flanagan
2011-2-8
Marwa says, "thanks alot"
Todd Flanagan
2011-2-8
Andrew says, "If you like this answer, could you please accept it?"
James Tursa
2011-3-21
0 个投票
You might take a look at this FEX submission by Matt J:
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