how to sort the elements of 2D matrix and understand their initial column and rows of each elements?

Question

zohre saeedi 2016-7-10

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/294630-how-to-sort-the-elements-of-2d-matrix-and-understand-their-initial-column-and-rows-of-each-elements

回答： Alexander Venus 2019-2-19

I have 20*30 matrix . I want to ascending sort matrix and understand their initial column and rows of each elements. for example a=[7 10 6;8 6 11] then sort b=[6 6 7 8 10 11] ,initial index of 10 is (1 2),.... can any body help me to write matlab code?

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

Stephen23 2016-7-10

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/294630-how-to-sort-the-elements-of-2d-matrix-and-understand-their-initial-column-and-rows-of-each-elements#answer_228223

在 MATLAB Online 中打开

Perhaps you want something like this:

>> a = [7,10,6;8,6,11]
a =
     7    10     6
     8     6    11
>> [R,C] = ndgrid(1:size(a,1),1:size(a,2));
>> [b,idx] = sort(a(:));
>> b % sorted values:
b =
     6
     6
     7
     8
    10
    11
>> [R(idx),C(idx)] % initial (R,C) indices of the sorted values
ans =
     2     2
     1     3
     1     1
     2     1
     1     2
     2     3

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。

Answer 2

Alexander Venus 2019-2-19

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/294630-how-to-sort-the-elements-of-2d-matrix-and-understand-their-initial-column-and-rows-of-each-elements#answer_361704

在 MATLAB Online 中打开

this can also be accomplished more intuitive by using ind2sub:

>> a = [7,10,6;8,6,11]
a =
     7    10     6
     8     6    11
>> [b,idx] = sort(a(:));
>> b
b =
     6
     6
     7
     8
    10
    11
>> [i, j] = ind2sub(size(a), idx)
i =
     2
     1
     1
     2
     1
     2
j =
     2
     3
     1
     1
     2
     3