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how i can put the (-1) in binary matrix with condition ?

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how i can put (-1) after and before any group of ones in matrix like this
before code A = [ 1 1 0 0 0 1 0 1 1
0 1 1 0 0 0 0 1 1
0 0 1 1 0 0 1 0 0 ]
after code A* = [ 1 1 -1 0 -1 1 -1 1 1
-1 1 1 -1 0 0 -1 1 1
0 -1 1 1 -1 -1 1 -1 -1 ]

Accepted Answer

Azzi Abdelmalek
Azzi Abdelmalek on 9 Apr 2016
Edited: Azzi Abdelmalek on 9 Apr 2016
A = [ 1 1 0 0 0 1 0 1 1
0 1 1 0 0 0 0 1 1
0 0 1 1 0 0 1 0 0 ]
for k=1:size(A,1);
id_before=strfind(A(k,:),[0 1])
id_after=strfind(A(k,:),[1 0])+1
A(k,[id_before id_after])=-1
end

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More Answers (1)

Kuifeng
Kuifeng on 9 Apr 2016
% is the last number in your A* equal to 0 instead?
%the following code may work
[rows cols] = size(A);
A_diff = A(:,1:end-1)-A(:, 2:end);
A(find(A_diff == -1)) = -1;
A(find(A_diff == 1)+rows) = -1;

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