# min function on two arrays

32 visualizaciones (últimos 30 días)
Robert Demyanovich el 8 de Jun. de 2021
Comentada: Walter Roberson el 8 de Jun. de 2021
I've read the documentation on the min function, but still don't understand how it works on two arrays. I have the following:
dS=zeros(1,N)
dS=min(cA(i+1,:),cB(i+1,:))
where cA and cB are equally sized arrays. Doesn't the min function just take the value at equivalent locations in cA or cB that is the lowest. So if position 10,50 in cA is 5 and the same position in cB is 3, min returns 3 in the resulting row vector, dS, at column 50. Is that correct?
##### 3 comentariosMostrar 1 comentario más antiguoOcultar 1 comentario más antiguo
Robert Demyanovich el 8 de Jun. de 2021
No, I'm just a MatLab beginner trying to understand some complex (for me, anyway) code.
What if dS had been defined as an array? I guess the result is the same because in both cA and cB, the i+1 row has been specified.
James Tursa el 8 de Jun. de 2021
Editada: James Tursa el 8 de Jun. de 2021
This line creates dS as a vector:
dS=zeros(1,N)
Then this line completely overwrites the dS you just created and instead assigns dS the result of the min( ) function call:
dS=min(cA(i+1,:),cB(i+1,:))
I.e., the first line is completely useless and accomplishes nothing because it gets overwritten in the second line.
And yes, cA(i:1,:) and cB(i+1,:) will be a row vectors if i is a scalar.

Iniciar sesión para comentar.

SALAH ALRABEEI el 8 de Jun. de 2021
%
dS=min([cA(i+1,:),cB(i+1,:)])
##### 3 comentariosMostrar 1 comentario más antiguoOcultar 1 comentario más antiguo
SALAH ALRABEEI el 8 de Jun. de 2021
Oops, yes it must be semicol; Thanks.
% correction
dS=min([cA(i+1,:);cB(i+1,:)])
Walter Roberson el 8 de Jun. de 2021
That would work in the case that cA and cB have the same number of columns.
The original code
dS=min(cA(i+1,:),cB(i+1,:))
would also work if one of cA or cB had a single column and the other one did not.

Iniciar sesión para comentar.

### Categorías

Más información sobre Matrices and Arrays en Help Center y File Exchange.

### Community Treasure Hunt

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

Start Hunting!

Translated by