Counting changes binary number batch
1 view (last 30 days)
Show older comments
Hi If I have a binary data f.ex. (see data below) would it be possible to count how often it changes and say that we don't count it as a change if one number in a long run of number variates?
data = [ 0 1 1 1 1 1 0 0 1 0 0 0 1 1 1 1 1];
For this data we would say we don't count take data(1) but we count data(2:6) as a change. Then data(7:12) and that data(9) doesn't effect the count.
Is it possible to construct a general code for this?
0 Comments
Accepted Answer
Walter Roberson
on 16 Jan 2013
t = data;
t(2:end-1) = t(2:end-1) | (t(1:end-2) & t(3:end));
numchange = sum( t(1:end-1) ~= t(2:end) );
2 Comments
Walter Roberson
on 16 Jan 2013
The second line was intended to adjust for those cases, but I realize now it only adjusts for the case of a 0 in the middle of 1's.
Let's see...
t = data;
mask = (t(1:end-2) ~= t(2:end-1)) & (t(1:end-2) == t(3:end));
t([false mask false]) = ~t([false mask false]);
numchange = sum( t(1:end-1) ~= t(2:end) );
More Answers (0)
See Also
Categories
Find more on Author Block Masks in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!