matlab: Sparse Function for any matrix

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Antony
Antony 2013-10-24
评论： Antony 2013-10-25
I am trying to write a sparse function code for any matrix size. For example if i have a matrix:
A = [ 0 0 0 5
0 2 0 0
1 3 0 0
0 0 4 0];
a=size(A);
b=size(A);
c=0;
position=0;
for i=1:a for j=1:b if A(i,j) ~=0
c=c+1;
position=position+1;
S(c,:)=[position,i,j,A(i,j)];
end
end
end
S
S --> is the storage matrix for all the non zero elements for A matrix. In addition to this information(Index,Row Number, Column Number, Value) how do I include two more columns in the matrix which shows the next element in row & the next element in column.
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James Tursa
James Tursa 2013-10-25
@Antony: So you want a linked list that goes by rows, and a separate linked list that goes by columns? And both linked lists have wraparound to next row (or column) and even back to the beginning? Is that what you want?

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回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2013-10-24
Why you don't use sparse function?
B=sparse(A)
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Antony
Antony 2013-10-24
The sparse function does not display all the results that I need. I am not worried about the size of the matrix or speed. I want to display more columns to the same sparse matrix according to my requirement.

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