Binary table - counting bits in rows

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Henry Buck 2015-9-15

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https://ww2.mathworks.cn/matlabcentral/answers/243085-binary-table-counting-bits-in-rows

编辑： Star Strider 2015-9-15

采纳的回答： Thorsten

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Hi,

How can I print only the rows that have only two '1' bits in rows? like this one:

       0     0     1     1
       0     1     0     1
       0     1     1     0
       1     0     0     1
       1     0     1     0
       1     1     0     0

Thanks, Henry

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Answer 1

Thorsten 2015-9-15

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 table= dec2bin(0:(2^4-1)) - '0';
 Nones = sum(table, 2);
 table(Nones==2, :)

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Henry Buck 2015-9-15

Thanks a lot, Henry

Image Analyst 2015-9-15

table is a reserved word for a special data type in MATLAB so I would pick another variable name.

When you said "two '1' bits in rows" and gave this "0 0 1 1 0 1 0 1 0 1 1 0 1 0 0 1 1 0 1 0 1 1 0 0" (just a single row), I thought you meant "two 1's in a row", meaning two 1's that were consecutive/adjacent, so that's what my code did.

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Answer 2

Image Analyst 2015-9-15

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Do you have the Image Processing Toolbox? If so, it's simple to just call regionprops on each row and measure the lengths of all 1 segments. If any of the lengths = 2, then print that row with fprintf(), like this untested code:

for row = 1 : rows
    thisRow = m(row, :);
    labeledData = bwlabel(thisRow); % Identify each separate segment.
    measurements = regionprops(labeledData, 'Area');
    allLengths = [measurements.Area];
    % See if any of the stretches of 1's are 2 in length
    if any(allLengths == 2)
        fprintf('%d ', thisRow);
        fprintf('\n');
    end
end