Finding Consecutive values in array that meet specific Criteria?

I have a list of values

a = [3 10 7 6 2 3 4 8]

I want to find the longest list of terms where a is greater than a certain threshold. So when a>5. These values would be [10 7 6] for the specific example and I would also like this be the output. Each value is consecutive and greater than the threshold. Although 8 is greater than the threshold, it is not consecutive. I would like to be able to do this without a looping structure if at all possible.

Answer 1

[Matt J]

S=regionprops(a>5,'PIxelIdxList','Area');
[~,idx]=max([S.Area]);

longest = a(S(idx).PixelIdxList)

Answer 2

[Azzi Abdelmalek]

a = [3 10 7 6 2 3 4 8 4 2 7 8 9 10 1 2 7]
idx=[0 a>5 0]
ii=strfind(idx,[0 1]);
jj=strfind(idx,[1 0])-1;
[b1,b2]=max(jj-ii+1);
sequence=a(ii(b2):jj(b2))

Answer 3

[Image Analyst]

If you have the Image Processing Toolbox, it's just basically 2 or 3 lines of code : a call to bwlabel and one call to regionprops:

% Check that user has the Image Processing Toolbox installed.
hasIPT = license('test', 'image_toolbox');
if ~hasIPT
  % User does not have the toolbox installed.
  message = sprintf('Sorry, but you do not seem to have the Image Processing Toolbox.\nDo you want to try to continue anyway?');
  reply = questdlg(message, 'Toolbox missing', 'Yes', 'No', 'Yes');
  if strcmpi(reply, 'No')
    % User said No, so exit.
    return;
  end
end

a = [3 10 7 6 2 3 4 8]
% Threshold greater than 5 and label.
labeled = bwlabel(a > 5)
measurements = regionprops(labeled, a, 'area', 'PixelValues')
% Get all the areas (lengths of runs above threshold).
allAreas = [measurements.Area]
% Sort them in descending order
[sortedAreas, sortIndices] = sort(allAreas, 'Descend')
% Get the values of the data with the longest run (largest area).
fprintf('The values of the longest run are: ');
valuesOfLongest = measurements(sortIndices(1)).PixelValues;
fprintf('%d ', valuesOfLongest);
fprintf('\n');

In the command window, you'll see the results:

a =
     3    10     7     6     2     3     4     8
labeled =
     0     1     1     1     0     0     0     2
measurements = 
2x1 struct array with fields:
    Area
    PixelValues
allAreas =
     3     1
sortedAreas =
     3     1
sortIndices =
     1     2
The values of the longest run are: 10 7 6

If you don't follow that, let me know.