how to do loop on rows matrix?
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i have zeros matrix which has 3 rows and 6 columns. i want to allocate “1” on zeros matrix for each columns in order to get the result output like this attached picture. can anyone be kind to help me? thanks in advance
采纳的回答
As mentioned in your question, if you have zeros matrix to start with and want to allocate 1s to specfiic zero locations, then you can get the matrix in snapshot using loop as below
A = zeros(3,6); % assume A as your zeros matrix
for k = 1:length(A)-2
if k == 1 | k == 2 | k == 3
A(k,k) = 1;
elseif k == 4
A(1,k) = 1;
A(2,k+1) = 1;
A(3,k+2) = 1;
end
end
A
2 个评论
Risma Fitriyani
2022-12-23
VBBV
2022-12-23
It depends on how you want final matrix to look like. That is "in which specific positions you want to allocate 1s in zero matrix"
更多回答（2 个）
It looks like the 1's are only needed on the diagonal elements.
You can do this with:
repmat(eye(3),1,2)
4 个评论
Risma Fitriyani
2022-12-26
A more general approach would be:
m = 15;
n = 25;
A = repmat(eye(m),1,ceil(n/m)) %repeat I and store in A.
A = A(:,1:n) %cut off last columns from Matrix A
m and n define the size of your result.
Note that the repmat command results in a matrix that generally would be too wide (
here ). Therefore you have to cut off the last 5 columns (or take the first n columns of matrix 
).
here ). Therefore you have to cut off the last 5 columns (or take the first n columns of matrix ).
Risma Fitriyani
2022-12-26
Risma Fitriyani
2022-12-26
% For 3x6:
c = [1 0 0 1 0 0];
r = [1 0 0];
output = toeplitz(r, c)
% For 15 by 25
c = [1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1];
r = [1; zeros(15, 1)];
output = toeplitz(r, c)
3 个评论
Markus M.
2022-12-26
Didn't think about this interpretation. @Risma Fitriyani can you describe in more detail, what you want your matrix to look like?
Risma Fitriyani
2022-12-26
Image Analyst
2022-12-27
@Risma Fitriyani did you not like my answer for the 15x25? Does the answer you accepted work?
Again, can you give the full output for your 15x25 matrix like @Markus M. directly asked you for? I'd like to see how my solution does not do what you want.
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