how to count number of repeating's in data series.

60 views (last 30 days)
for example my matrix A=[22 24 24 36 36 36 48 48 48 48 24 33 22 22]; i need to count how many twos, threes, four time repeating's etc

Answers (4)

Massimo Zanetti
Massimo Zanetti on 3 Oct 2016
Edited: Massimo Zanetti on 3 Oct 2016
This code
A = [22 24 24 36 36 36 48 48 48 48 24 33 22 22]';
C = accumarray(A,1);
I = unique(A);
counts = [I,C(I)]
returns
out = 22 3
24 3
33 1
36 3
48 4
  1 Comment
shashika iresh
shashika iresh on 3 Oct 2016
no dear, i need to find the repeating(double, triple, four time, etc of same number. for a example above matrix 2 doubles(24 24,22 22),and only 1 triple(36 36 36) ,and only one four times(48 48 48 48). li

Sign in to comment.


Andrei Bobrov
Andrei Bobrov on 4 Oct 2016
Edited: Andrei Bobrov on 4 Oct 2016
A=[22 24 24 36 36 36 48 48 48 48 24 33 22 22];
V = A(:);
[~,~,c] = unique(V);
t = diff([0;c])~= 0;
ix = cumsum(t);
out = [V(t),accumarray(ix(:),1)];
out2 = [num2cell((1:max(out(:,2)))'),...
accumarray(out(:,2),out(:,1),[],@(x){sort(x(:)')})];

Adrian Stannard
Adrian Stannard on 3 Oct 2016
Edited: Adrian Stannard on 4 Oct 2016
I think I understand what you want - it is the successive re-occurrences of a number.
Array=[22 24 24 36 36 36 48 48 48 48 24 33 22 22];
Array(find(diff(Array)==0))
This returns only the repeated elements from the Array after the first occurrence.
You could go further, for example use:
counts=hist(Array(find(diff(Array)==0)))
This gives you the how many times they are repeated. Alternatively:
Array2 = Array(find(diff(Array)==0));
Array3= zeros (size(Array2));
for i = 1:length(Array2)
Array3(i) = sum(Array2==Array2(i));
end
Array3=Array3+1
Array2=Array2([1,diff(Array2)]~=0);
Array3=Array3([1,diff(Array3)]~=0);
will return:
24 36 48 22
2 3 4 2
  5 Comments
shashika iresh
shashika iresh on 5 Oct 2016
please check for this it give wrong answer. A =[24 24 24 24 36 36 36 48 48 48 48 48 48 48 28 24 24 22 22 22 22 22 22 22 22 22 22]; Array2 =
24 36 48 24 22
Array3 =
5 3 7 5 10

Sign in to comment.


Thorsten
Thorsten on 4 Oct 2016
Edited: Thorsten on 4 Oct 2016
N(i) is the the number of occurrences of series of i numbers in A:
N = zeros(numel(A), 1);
i = 1;
while(i) < numel(A)
Ni = 1; val = A(i);
while i < numel(A) && A(i+1) == A(i)
i = i + 1; Ni = Ni + 1;
end,
N(Ni) = N(Ni) + 1;
i = i + 1;

Categories

Find more on Matrices and Arrays in Help Center and File Exchange

Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!