MATLAB: How to get specific value

specificvalue

A = [5 2 3 8 7 1 2 2 3]
[labeledA, numRegions] = bwlabel(A < 4)
% Get the size of the regions.
props = regionprops(labeledA, 'Area')
elementCounts = [props.Area]
In the command window:
A =
   5     2     3     8     7     1     2     2     3
labeledA =
   0     1     1     0     0     2     2     2     2
numRegions =
   2
props = 
2×1 struct array with fields:
  Area
elementCounts =
   2     4
And I get sth like this:
elementCounts =
 2     4
value = 
2 3 1 2 2 3

Best Answer

One way:
A = [5 2 3 8 7 1 2 2 3]';
b = A < 4;
ii = bwlabel(b);
elementCounts = accumarray(ii(ii>0),1)
value = A(b)
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