MATLAB: Sorting a Matrix using Indices from another matrix !

columnwise sortingmatrix sortingsort matrix using matrix

Hello

I have a pretty simple question !

I have a matrix A (lets assume has a size 5 x 5) and I have another matrix of same size (5 x 5) called IDX that contains the values for sorting A in a colum-wise manner.

So how can I easily sort each column of A using matrix IDX without using a for loop or extracting each column of IDX as an individual vector ?

Thank you in advance !

Best Answer

[m,n]=size(A);
A=A(sub2ind([m n],idx,repmat(1:n,m,1)))

Related Solutions

MATLAB: Sort matrix to get the row and column position of sorted matrix

[~,idx] = sort(M(:), 'descend');
idx(M(:)==0) = [];
[row, col] = ind2sub(size(M), idx);
indexes = [row col];

Result:

MATLAB: How to assign numbers to each row of a matrix? knowing that the matrix is 70×4 so that each row has an index from 1 to 70. Thank’s

You already have, by storing your data in a matrix.

A = magic(5)
A = 5×5
    17    24     1     8    15
    23     5     7    14    16
     4     6    13    20    22
    10    12    19    21     3
    11    18    25     2     9
% Data associated with the number 3
A(3, :)
ans = 1×5
     4     6    13    20    22

If you have different requirements for your numbering that the row indices do not satisfy, please state those requirements.

Best Answer

Related Solutions

MATLAB: Sort matrix to get the row and column position of sorted matrix

MATLAB: How to assign numbers to each row of a matrix? knowing that the matrix is 70×4 so that each row has an index from 1 to 70. Thank’s

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