MATLAB: Counting Repeated elements in an array.

arrays

Suppose I have 2 arrays, A and B, comprised of random sets of unique numbers. I want to compare the 2 lists and count the number of elements that appear in both lists.

For example if we have A = [1 2 3 4 5 6] and B = [6 7 8 9 10 11]. It'll output 1.

Best Answer

nnz(ismember(A,B));

Related Solutions

MATLAB: Retrun largest numbers

>> [~, idx] = sort(A);
>> B = A(sort(idx(end-2:end))))

MATLAB: Counting number of repeated elements

You can use regionprops() to get the length, then do something on each set of indexes where the length exceeds 360. If you have the Image Processing Toolbox, here's a start

% Find zeros, convert to binary, then label each region:
[labeledRegions, numRegions] = bwlabel(doubleVector == 0); 
% Measure lengths of each region, and get indexes of each region.
props = regionprops(labeledRegions, 'Area', 'PixelIdxList');
% Loop over all regions, looking for regions that are 360 elements or longer.
for k = 1 : numRegions
    % See if this stretch of zeros is 360 or longer.
    if props(k).Area >= 360
        % This stretch of zeros is 360 or longer.
        theseIndexes = props(k).PixelIdxList;
        % Now do something with these indexes.
    end
end

Best Answer

Related Solutions

MATLAB: Retrun largest numbers

MATLAB: Counting number of repeated elements

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