MATLAB: Matrix Indexing with respect to sum of matrix raws

doit4mehomework

A =

-9 3 -1 9

-4 0 1 -2

-2 5 6 -9

I want to sort it and want to get following result after sort matrix A kindly let me know how i can get following results:

A =

-4 0 1 -2

-2 5 6 -9

-9 3 -1 9

Here matrix A is sort based of sum of each row.

Best Answer

1) Sum A with respect to rows.

2) Use sort() for sum of rows and collect the second output of it.

3) Use the second output of sort() as the row indices of A.

Related Solutions

MATLAB: Flipping the rows in a matrix to rearrange according to the weighted sum of the row

>> A=[0.6 0.4 0.9 0.7;0.8 0.7 0.9 0.5;0.8 0.6 0.5 0.4;0.8 0.5 0.6 0.5]
A =
          0.6          0.4          0.9          0.7
          0.8          0.7          0.9          0.5
          0.8          0.6          0.5          0.4
          0.8          0.5          0.6          0.5
>> [~,idx] = sort(-sum(A,2))
idx =
     2
     1
     4
     3
>> A(idx,:)
ans =
          0.8          0.7          0.9          0.5
          0.6          0.4          0.9          0.7
          0.8          0.5          0.6          0.5
          0.8          0.6          0.5          0.4

MATLAB: HOW TO SHIFT COLUMN AND ROW MATRIX

x=repmat([1 2 3 4],4,1); x(6,6)=0
x = 6×6
     1     2     3     4     0     0
     1     2     3     4     0     0
     1     2     3     4     0     0
     1     2     3     4     0     0
     0     0     0     0     0     0
     0     0     0     0     0     0
perm=[1,2,5,6,3,4];
x(perm,perm),
ans = 6×6
     1     2     0     0     3     4
     1     2     0     0     3     4
     0     0     0     0     0     0
     0     0     0     0     0     0
     1     2     0     0     3     4
     1     2     0     0     3     4

Best Answer

Related Solutions

MATLAB: Flipping the rows in a matrix to rearrange according to the weighted sum of the row

MATLAB: HOW TO SHIFT COLUMN AND ROW MATRIX

Related Question