Constraints applied to circshift function
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If i have a matrix A:
0 0
0 1
1 1
1 1
0 0
and I applied the following shift function (to shift rows downwards):
id=randi(6,1,size(A,2));
shift = cell2mat(arrayfun(@(x) circshift(A(:,x),[id(x) 1]),(1:numel(id)),'un',0));
How would I apply the following constraint: "The ones never get separated in their respective column" such as in the below eg. with column 2
id = 1 2
A=
0 1
0 0
0 0
1 1
1 1
Thank you for any help!
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Image Analyst
2015-2-21
You can use all() or sum() to find out which rows are all zeros. Then use find() to figure out where the last row that has a 1 in it. Then you'll know how far you can shift the rows down. If you pick a random shift, make sure that it's not more than that number or else they'll go past the end of the array.
Here's a start for you:
theSum = sum(A, 2);
lastRow = find(theSum > 0, 1, 'last');
rowsThatICanShift = size(A, 1) - lastRow;
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