storing multiple matrices from a loop

2020 6 2
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更新时间：2020 6 2
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I have a 5x5 matrix and what the program is supposed to do is to run through the columns(i) and whenever it finds a row in the ith column that is zero. It makes the whole row zero [0 0 0 0 0]. And store the different matrices for every(i) column in a matrix DBIBC(i). So far the loop only runs for the DBIBC(1) and stores only that in the array.
rw finds the rows in the column that are zero.
Please help me.
BIBC = [1 1 1 1 1;0 1 1 1 1;0 0 1 1 0;0 0 0 1 0;0 0 0 0 1] ;
DBIBC = BIBC;
N=length(BIBC);
for i=1:N
rw = find(DBIBC(:,i)==0)
DBIBC(rw,:)= 0
DBIBC(i)
B{i} = DBIBC;
end

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KSSV
KSSV 2020-6-2
Can you show us the epxected output for the above?
Luqmann Mahama
Luqmann Mahama 2020-6-2
DBIBC(1)=[1 1 1 1 1; 0 0 0 0 0; 0 0 0 0 0 ; 0 0 0 0 0 ; 0 0 0 0 0]
DBIBC(2)=[1 1 1 1 1; 0 1 1 1 1; 0 0 0 0 0 ; 0 0 0 0 0 ; 0 0 0 0 0]
DBIBC(3)=[1 1 1 1 1; 0 1 1 1 1; 0 0 1 1 0 ; 0 0 0 0 0 ; 0 0 0 0 0]
DBIBC(4)=[1 1 1 1 1; 0 1 1 1 1; 0 0 1 1 0 ; 0 0 0 1 0 ; 0 0 0 0 0]
DBIBC(5)=[1 1 1 1 1; 0 1 1 1 1; 0 0 0 0 0 ; 0 0 0 0 0 ; 0 0 0 0 1]

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 采纳的回答

Daniel Abajo
Daniel Abajo 2020-6-2

0 个投票

Hi,
You need to re-inizialize the temporary matrix DBIBC for each iteration, if not the first iteration makes 2-5 rows 0 and thats all....
BIBC = [1 1 1 1 1;0 1 1 1 1;0 0 1 1 0;0 0 0 1 0;0 0 0 0 1] ;
N=length(BIBC);
for i=1:N
DBIBC = BIBC;
rw = find(DBIBC(:,i)==0)
DBIBC(rw,:)= 0
DBIBC(i)
B{i} = DBIBC;
end

更多回答（1 个）

Daniel Abajo
Daniel Abajo 2020-6-2

0 个投票

Actually is shorter, faster and smart the following code, see that the isequal returns true...
BIBC = [1 1 1 1 1;0 1 1 1 1;0 0 1 1 0;0 0 0 1 0;0 0 0 0 1] ;
DBIBC=repmat(BIBC,1,1,size(BIBC,2));
DBIBC2=permute(repmat(BIBC,1,1,size(BIBC,2)),[1,3,2]);
DBIBC(find(DBIBC2==0))=0;
N=length(BIBC);
for i=1:N
DBIBC = BIBC;
rw = find(DBIBC(:,i)==0)
DBIBC(rw,:)= 0
DBIBC(i)
B{i} = DBIBC;
end
isequal(reshape(cell2mat(B),size(BIBC,1),size(BIBC,2),[]),DBIBC)

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