# Sum every element in matrix per group

3 visualizaciones (últimos 30 días)
Joes de Jonge el 16 de Jun. de 2021
Respondida: SALAH ALRABEEI el 16 de Jun. de 2021
Let A = [1, 4; 5, 6] and b = [1, 1, 1, 2]. A is here the matrix with the values and b the matrix with the group labels. I would like to sum every item in A according to their label such that I would get something back like c = [10, 6] where thus the labels of b correspond to the indices of c.
How can this be done in MatLab? I already saw accumarray is a logical function to use but it doesn't work on values that aren't vectors.
##### 0 comentariosMostrar -2 comentarios más antiguosOcultar -2 comentarios más antiguos

Iniciar sesión para comentar.

### Respuestas (1)

SALAH ALRABEEI el 16 de Jun. de 2021
d = unique(b);
c = [];for i=1:length(d)
c=[c,sum(a(b==d(i)))];
end
##### 0 comentariosMostrar -2 comentarios más antiguosOcultar -2 comentarios más antiguos

Iniciar sesión para comentar.

### Categorías

Más información sobre Structures en Help Center y File Exchange.

R2021a

### Community Treasure Hunt

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

Start Hunting!

Translated by