Count size of groups of 1's
5 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
David AR
am 3 Mai 2019
Beantwortet: Pablo Rozier-Delgado
am 13 Jul. 2023
Hi all, this is my first question on the forum.
I have a vector called gpos that have 1's where I have a NaN value (gpos = isnan(data);)
For example
gpos = [1 1 1 0 0 1 1 0 1 1]'
I'd like to count the size of groups of 1's, like my expected result. How do I accomplish that? Thanks in advance.
result = [3 2 2]' % ignoring data that is zero
0 Kommentare
Akzeptierte Antwort
Erivelton Gualter
am 3 Mai 2019
Here is a way you can perform this:
gpos = [1 1 1 0 0 1 1 0 1 1]';
[I, ~] = find(gpos == 1);
k = 0;
result = [];
for i=2:length(I)
if (I(i)-I(i-1)) ~= 1
result = [result; k+1];
k = 0;
else
k = k + 1;
end
end
result = [result; k+1];
disp(result);
But definetly, you might write something simpler .
1 Kommentar
Matt J
am 29 Mär. 2021
David AR's comment moved here:
Thank you. The code works flawlessly. Best regards.
Weitere Antworten (1)
Pablo Rozier-Delgado
am 13 Jul. 2023
Another way, without for loop:
gpos = [1 1 1 0 0 1 1 0 1 1]'; % Detected NaNs
indGroups = bwlabel(gpos) + 1; % Label groups of ones and make it positive integers
result = accumarray(indGroups,gpos); % sum of each groups
result(result == 0) = [] % delete the 0 group
0 Kommentare
Siehe auch
Kategorien
Mehr zu Logical finden Sie in Help Center und File Exchange
Produkte
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!