How can I sort a matrix elementwise ?

Hi, I need to sort a matrix elementwise and get the results to a single vector without losing the index of each element.

For example,

A = [3, 4 ; 6, 2]

The sorted vector should be ,

B = [2;3;4;6]

without losing the information of each and every element in the original matrix.

Thank you.

Answer 1

[Andrei Bobrov]

A = [3, 4 ; 6, 2];

[m,~] = size(A);
[B,i] = sort(A(:));
index = [mod(i-1,m) + 1, ceil(i/m)];

[Gayan Lankeshwara]

Hi Andrei,

I tried the code and this is what I wanted.

Thank you.

Answer 2

[Stephan]

B = sort(reshape(A,[],1))

[Gayan Lankeshwara]

Hi Stephan,

Thank you for your answer.

But I actually need is something like this.

A = [3, 4 ; 6, 2]

The sorted vector should be ,

B = [2;3;4;6]

without losing the information of each and every element in the original matrix.

After I sorted the matrix and put the elements in a vector, I need to find the original index for each and every element in the sorted vector.

For example, in B=[2;3;4;6]

I need to tell element 6 is the A(2,1) element.

Actually this is kind of sorting with preserving the index.

If I just sort it, I cannot backtrack the original index of the each and every element.

Thanks.

[Stephan]

[B, idx] = sort(reshape(A,[],1))
[row,col] = ind2sub([size(A,1), size(A,2)],idx)

[Gayan Lankeshwara]

Hi Stephan,

This is really what I needed and the inbuilt in2sub function is more powerful I guess.

Thanks.