How to concatenate multi rows in matrix ?

Question

hewaa mero 2013-11-28

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/107873-how-to-concatenate-multi-rows-in-matrix

评论： hewaa mero 2013-11-28

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
3 3 3 3 3 3 3
4 4 4 4 4 4 4
5 5 5 5 5 5 5
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
3 3 3 3 3 3 3
4 4 4 4 4 4 4
y =  1 1 1 1 1 1 1 1 
2 2 2 2 2 2 2
5 5 5 5 5 5 5
6 6 6 6 6 6 6
y =  3 3 3 3 3 3 3 3
4 4 4 4 4 4 4
5 5 5 5 5 5 5
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

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Andrei Bobrov 2013-11-28

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/107873-how-to-concatenate-multi-rows-in-matrix#answer_116604

编辑：Andrei Bobrov 2013-11-28

在 MATLAB Online 中打开

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 个评论
显示 2更早的评论隐藏 2更早的评论

Andrei Bobrov 2013-11-28

see ADD part

hewaa mero 2013-11-28

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,.....

请先登录，再进行评论。