Group number identification consecutive numbers
11 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Marek Drliciak
am 11 Nov. 2022
Verschoben: Bruno Luong
am 21 Nov. 2022
Hello
I have millions of 1-0 data in my database. I need to detect groups of consecutive units. I would like to ask you to create the attribute "Gr_numb". An example is given in the attached file. The searched attribute is calculated there. But in Excel it is very complicated and unusable for a large database.
Thank You
6 Kommentare
Image Analyst
am 11 Nov. 2022
OK I think I see now, though it is probably a poor example since the second group and third groups both have a group label of 3. I don't see why two different groups should have the same group number, but the example would have been clearer if the third group had had 4 or 5 1's in it instead of 3 (same as the prior group). You must have the Mind Reading Toolbox Bruno.
Jan
am 11 Nov. 2022
Bearbeitet: Jan
am 11 Nov. 2022
@Image Analyst: The term "group number" is misleading. "Number of group members" would be clearer.
Akzeptierte Antwort
Jan
am 11 Nov. 2022
Bearbeitet: Jan
am 11 Nov. 2022
index = [1 0 1 1 1 0 0 0 1 1 1 0 1 1 0 0 1 1];
[b, n] = RunLength(index);
m = n(b == 1);
Gr_numb = zeros(size(index));
GR_numb(index == 1) = RunLength(m, m);
If you do not have a C-compiler installed, use RunLength_M from this submission.
Or:
d = [true, diff(index) ~= 0]; % TRUE if values change
n = diff(find([d, true])); % Number of repetitions
m = n(index(d) == 1);
index(index == 1) = repelem(m, m)
1 Kommentar
Weitere Antworten (1)
Stephen23
am 11 Nov. 2022
X = [1;0;1;1;1;0;0;0;1;1;1;0;1;1;0;0;1;1;0;1;0;0;1;1;0;1;1;1;1;0;1;1;1;1;1;;0;1;1;1;1;1;1;1;1;1;0;0;0;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;1;0]
D = diff([0;X;0]);
B = find(D>0);
E = find(D<0);
L = E-B;
G = X;
G(X==1) = repelem(L,L)
0 Kommentare
Siehe auch
Kategorien
Mehr zu Get Started with MATLAB 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!