how to combine matrix easier
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metumetu
el 11 de Mzo. de 2020
Comentada: BobH
el 12 de Mzo. de 2020
Hello,
I want. How can i do this (below code block) with a loop?
I have to do this with a loop because, i will be doing this with a lots of a matrices. please help me.
Thank you.
a1=[1,2,3; 4,5,6; 7,8,9]
a2=[10,11,12; 13,14,15; 16,17,18]
a3=[19,20,21; 22,23,24; 25,26,27]
b1=[a1(:,1);a1(:,2);a1(:,3)]
b2=[a2(:,1);a2(:,2);a2(:,3)]
b3=[a3(:,1);a3(:,2);a3(:,3)]
C=[b1,b2,b3]
2 comentarios
BobH
el 11 de Mzo. de 2020
Editada: BobH
el 11 de Mzo. de 2020
You are reading a1/a2/a3 in column order, all rows of col 1, then all rows of col 2, then all rows of col 3. This is the same as the single-index linear indexing
b1 = a1(:)
All the b1/b2/b3 assignments can be eliminated
C = [a1(:) a2(:) a3(:)]
Ameer Hamza
el 11 de Mzo. de 2020
BobH, the actual problem is that OP wants to do it with lots of matrices, so manually concatenating array will not be practical.
Respuesta aceptada
Ameer Hamza
el 11 de Mzo. de 2020
If the data is stored properly, i.e., in cell array instead of using separate variables, the following one-liner will work
a{1}=[1,2,3; 4,5,6; 7,8,9];
a{2}=[10,11,12; 13,14,15; 16,17,18];
a{3}=[19,20,21; 22,23,24; 25,26,27];
C = cell2mat(cellfun(@(x) x(:)', a, 'UniformOutput', 0)')';
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