Delete rows and cols of a sparse matrix

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Kris zenitis
Kris zenitis 2014-6-10
评论： Matt J 2014-6-10
I ve got a nx3 matrix, which correspont to a nxn sparse matrix with a x,y and the weight z. I want in a for loop to find and delete specific x, y. For example I want iterative to delete from 1 to n the first column and row the second row and column until the nth row and column in order to create n-1 matrices with (n-1 rows and columns). How can I look inside the sparse representatino of the matrix in order to do such a thing?

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回答（1 个）

Matt J
Matt J 2014-6-10
编辑：Matt J 2014-6-10
S=sparse(x,y,z);
C=cell(1,n-1);
tmp=S;
for i=1:n
tmp(1,:)=[];
tmp(:,1)=[];
C{i}=tmp;
end
  1 个评论
Matt J
Matt J 2014-6-10
Or, to have the results in the original three-column form
for i=1:n
tmp(1,:)=[];
tmp(:,1)=[];
[i,j,s]=find(tmp);
C{i}=[i,j,s];
end

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