清空筛选条件
清空筛选条件

storing multiple matrices from a loop

1 次查看（过去 30 天）
Luqmann Mahama
Luqmann Mahama 2020-6-2
评论： Luqmann Mahama 2020-6-2
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
  2 个评论
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]

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Daniel Abajo
Daniel Abajo 2020-6-2
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
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)

类别

在 Help Center 和 File Exchange 中查找有关 Loops and Conditional Statements 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by