hi every one ,

9 vues (au cours des 30 derniers jours)
mina massoud
mina massoud le 7 Mai 2019
Modifié(e) : Adam Danz le 13 Mai 2019
A=[ 1 1 1 2 2 3 3 3 1 1 4 4 4 2 2 3 3 3 4 3 ]
how can i count the number of 1 and 2 and 3 and 4 in the row vector
thank u

Réponse acceptée

Alex Mcaulley
Alex Mcaulley le 7 Mai 2019
sum(A==1) % or sum(A==2)...
  1 commentaire
Adam Danz
Adam Danz le 9 Mai 2019
Modifié(e) : Adam Danz le 9 Mai 2019
Note that you'll need to calculate the unique values in A and then loop through each of them in order to use this method.
Aunq = unique(A);
count = zeros(size(Aunq));
for i = 1:length(Aunq)
count(i) = sum(A==Aunq(i)):
end
...which is all done in the one line of code I propsed using histcounts().

Connectez-vous pour commenter.

Plus de réponses (1)

Adam Danz
Adam Danz le 7 Mai 2019
Modifié(e) : Adam Danz le 13 Mai 2019
Use histcounts() instead. It's designed for this purpose.
A=[ 1 1 1 2 2 3 3 3 1 1 4 4 4 2 2 3 3 3 4 3 ];
counts = histcounts(A,[unique(A),max(A)+1]);
Result
list = table(unique(A)', counts', 'VariableNames', {'Number', 'Count'});
list =
4×2 table
Number Count
______ _____
1 5
2 4
3 7
4 4

Catégories

En savoir plus sur Matrices and Arrays dans Help Center et File Exchange

Produits


Version

R2018b

Community Treasure Hunt

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

Start Hunting!

Translated by