Calculate the remaining index of my data

Question

muhammad ismat 2017-9-27

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/358611-calculate-the-remaining-index-of-my-data

评论： muhammad ismat 2017-9-28

If i have

is the index of my data. i want to get on remaining of these index but not need index that have i=j i.e [ (1 1) (2 2) (3 3)(4 4)(5 5) and not need fliplr of x i.e [(2 1)(4 3)(5 2)(5 1)]. so i want to the result

that should not contain fliplr of any index.

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Rik 2017-9-27

It is not clear what your question is. It sounds like you could solve your problem with logical indexing, or even find (and maybe a call to ismember(fliplr(A),A)), but without understanding your problem better I can't help you with actual code.

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

the cyclist 2017-9-27

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/358611-calculate-the-remaining-index-of-my-data#answer_283385

在 MATLAB Online 中打开

Here is one way.

x= [1 2       
    3 4
    2 5
    1 5];
result = zeros(5*2,2);
ri = 1;
for ii=1:5
    for jj = ii+1:5
        result(ri,:) = [ii jj];
        ri = ri+1;
    end
end
isRowToRemove = ismember(result,x,'rows');
result(isRowToRemove,:) = [];

There is certainly a better way to pre-populate the array result with all possible row values than using the loops, but I got lazy.

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

muhammad ismat 2017-9-28

Thank you very much,the cyclist

请先登录，再进行评论。

Answer 2

OCDER 2017-9-27

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/358611-calculate-the-remaining-index-of-my-data#answer_283382

在 MATLAB Online 中打开

%Getting index of an arbitrary matrix
[x, y] = find(ones(5, 'logical'));
x = [x y];
%Remove index i == j
x(x(:,1) == x(:,2), :) = [];
%Get unique x,y and not those that are y,x
x = unique(sort(x, 2), 'rows');
x =
   1     2
   1     3
   1     4
   1     5
   2     3
   2     4
   2     5
   3     4
   3     5
   4     5