Filter löschen
Filter löschen

concatenate arrays after performing addition

3 Ansichten (letzte 30 Tage)
Neil Barker
Neil Barker am 15 Okt. 2019
Beantwortet: Jos (10584) am 15 Okt. 2019
I'm trying to add all the elements of A with element 1 of B. then do it again with element 2 etc. I'd like to concatinate the four 3x3 arrays into one array D (3x12). But i'm getting error messages.
This test code does what i want with array C, but i'm struggling getting all the previous FOR loops of C and the concatenation
A = [1,2,3;4,5,6;7,8,9];
B = [2,3,4,5];
C = zeros(3);
D = zeros(3,12);
for i = 1:numel(B)
C = A + B(i)
end
Thanks for any assistance you give,
Neil

Akzeptierte Antwort

Andrei Bobrov
Andrei Bobrov am 15 Okt. 2019
A = [1,2,3;4,5,6;7,8,9];
B = [2,3,4,5];
D = reshape(permute(A + reshape(B,1,1,[]),[2,1,3]),size(A,2),[])';
  1 Kommentar
Neil Barker
Neil Barker am 15 Okt. 2019
Thanks for your answer Andrei. I'll go through it now. My actual code will be A = NxN and
B = 1xN. so hopefully i'll be able to make a general case for D.
thanks again,
Neil

Melden Sie sich an, um zu kommentieren.

Weitere Antworten (1)

Jos (10584)
Jos (10584) am 15 Okt. 2019
A little simpler than all those permutes and reshapes:
A = [1 2 3 ; 4 5 6 ; 7 8 9] ;
B = [2 3 4 5] ;
C = repmat(A, numel(B), 1) + repelem(B(:), size(A,1), size(A,2))

Kategorien

Mehr zu Creating and Concatenating Matrices 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!

Translated by