Count the "areas" of zeros and the "areas" of ones in a vector?
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I have a vector:
a=[0 1 1 1 1 1 1 0 0 1 1 1 1 1 0 0 1 1 1 0 1 ];
in which I would like to count the "areas" of zeros and the "areas" of ones. In the example above I have
4 areas of zeros and 4 areas of ones. Thank you!
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Accepted Answer
Andrei Bobrov
on 21 Jun 2013
a=[0 1 1 1 1 1 1 0 0 1 1 1 1 1 0 0 1 1 1 0 1 ];
lc = [true;diff(a(:))~=0];
x = a(lc);
zerosareas = sum(~x);
onesareas = sum(x);
More Answers (2)
Jan
on 21 Jun 2013
a = [0 1 1 1 1 1 1 0 0 1 1 1 1 1 0 0 1 1 1 0 1 ];
b = RunLength(a);
nZero = sum(b == 0);
nOne = length(b) - nZero; % Or: sum(b == 1)
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Image Analyst
on 23 Jun 2013
I know you already accepted an answer, but if you have the Image Processing Toolbox there is a straightforward one-liner solution to get either of those numbers:
a=[0 1 1 1 1 1 1 0 0 1 1 1 1 1 0 0 1 1 1 0 1];
[~, numberOf1Regions] = bwlabel(a) % Get # of "1" regions.
[~, numberOf0Regions] = bwlabel(~a) % Get # of "0" regions.
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