function to count number of '1' in each row and column
6 views (last 30 days)
Show older comments
Firas Al-Kharabsheh
on 29 Mar 2016
Edited: Image Analyst
on 29 Mar 2016
if i have a (M , N) binary matrix which M is number of rows and N is the number of column , and i want to count Number of 1 in each row and for each column , for example [1 0 1 1 0 1 1 1 1 0 1 0 ] the the output will be in new matrix like this [ 1 2 4 1]
Matrix = [ 0 1 1 1 0 0 1 0 1 1
1 0 1 1 0 1 0 1 1 0
1 1 0 0 1 1 1 1 0 1
1 1 1 1 1 0 1 0 0 1
0 0 1 0 0 1 1 1 1 0
1 1 0 1 1 0 0 1 0 1 ]
Matrix_row = [3 1 2 0
1 2 1 2
2 4 1 0
5 1 1 0
1 4 0 0
2 2 1 1 ]
Matrix_col = [0 0 0 0 0 0 0 0 0 0
0 1 0 2 0 0 0 0 0 1
3 2 2 1 1 2 1 2 2 2
1 1 2 1 1 1 3 2 1 1 ]
i need this solution because its a part of graduation project please he me
2 Comments
Matthew Eicholtz
on 29 Mar 2016
Edited: Matthew Eicholtz
on 29 Mar 2016
I do not understand how Matrix_row and Matrix_col are being computed. Currently, it is not the number of ones in the each row or column (as far as I can tell). Can you provide more details?
Image Analyst
on 29 Mar 2016
Edited: Image Analyst
on 29 Mar 2016
Matt, it's basically the lengths of the "runs" of 1's in each direction, then padded with zeros to make it rectangular. Though I'm not sure why Matrix_col has a top row of all zeros - seems like that should have been omitted. So the first row has groupings/runs of 1's of lengths 3, 1, and then 2, each separated by zeros. The last row has 4 separate runs, so the Matrix_row array needs to have (at least) 4 columns. If some row had only , say, 2 runs, you'd have to append two zeros to make that row have the full 4 columns.
By the way, the lengths of the runs can be determined from regionprops() very, very easily:
stats = regionprops(logical(oneRow), 'Area');
allLengths = [stats.Area]; % Would give 3,1,2 for the first row in the example matrix.
By the way, this is a duplicate to http://www.mathworks.com/matlabcentral/answers/275707#answer_215257 where I outlined the solution but didn't give a complete solution because it seemed to be his assignment.
Accepted Answer
Azzi Abdelmalek
on 29 Mar 2016
Edited: Azzi Abdelmalek
on 29 Mar 2016
M = [ 0 1 1 1 0 0 1 0 1 1
1 0 1 1 0 1 0 1 1 0
1 1 0 0 1 1 1 1 0 1
1 1 1 1 1 0 1 0 0 1
0 0 1 0 0 1 1 1 1 0
1 1 0 1 1 0 0 1 0 1 ];
[n,m]=size(M);
b=cell(n,1);
c=cell(1,m);
maxb=1;
maxc=1;
for k=1:n
a=[0 M(k,:) 0];
ii1=strfind(a,[0 1]);
ii2=strfind(a,[1 0]);
maxb=max(maxb,numel(ii1));
b{k}=ii2-ii1;
end
for k=1:m
a=[0 M(:,k)' 0];
ii1=strfind(a,[0 1]);
ii2=strfind(a,[1 0]);
maxc=max(maxc,numel(ii1));
c{k}=(ii2-ii1)';
end
M_row=cell2mat(cellfun(@(x) [x zeros(1,maxb-numel(x))],b,'un',0))
M_column=cell2mat(cellfun(@(x) [zeros(1,maxc-numel(x));x],c,'un',0))
2 Comments
More Answers (0)
See Also
Categories
Find more on Logical in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!