How to concatenate multi rows in matrix ?

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hewaa mero
hewaa mero on 28 Nov 2013
Commented: hewaa mero on 28 Nov 2013
How to concatenate multi rows in matrix, for example I've a matrix 6X8
x= 1 1 1 1 1 1 1 1
2 2 2 2 2 2 2 2
3 3 3 3 3 3 3 3
4 4 4 4 4 4 4 4
5 5 5 5 5 5 5 5
6 6 6 6 6 6 6 6
the result like this
y = 1 1 1 1 1 1 1 1
2 2 2 2 2 2 2 2
3 3 3 3 3 3 3 3
4 4 4 4 4 4 4 4
y = 1 1 1 1 1 1 1 1
2 2 2 2 2 2 2 2
5 5 5 5 5 5 5 5
6 6 6 6 6 6 6 6
y = 3 3 3 3 3 3 3 3
4 4 4 4 4 4 4 4
5 5 5 5 5 5 5 5
6 6 6 6 6 6 6 6
tried concatenated row_row by this code below :
old=round(10*rand(6,8))
for n=1 :size(old)
for m=n+1:size(old)
newline = [old(n, :); old(m, :)]
end
end

Answers (1)

Andrei Bobrov
Andrei Bobrov on 28 Nov 2013
Edited: Andrei Bobrov on 28 Nov 2013
y = 1:6;
o = reshape(bsxfun(@times,kron(fliplr(~eye(3)),[1 1]),y)',1,[]);
out = repmat(reshape(o(o~=0),4,1,[]),1,7);
ADD
old = randi(40,6,8)
t = kron(fliplr(~eye(3)),[1 1])'>0
for jj = size(t,2):-1:1
out(:,:,jj) = old(t(:,jj),:);
end
  4 Comments
hewaa mero
hewaa mero on 28 Nov 2013
you mean I just use add part, and I used this part but answer not correct there 3 there matrix: out(:,:,1),out(:,:,2)again out(:,:,1), and out matrix is not ordered like that 1st part with 2nd part ,1st part with 3rd, 1st part with 4th,.....

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