Conversion of Matrix dimensions

Hi

I have a matrix 81 by 81 i.e.

          1  2  .  .  81
1      a1,1  a1,2      a1,81
          
.          
.          
81     a81,1        a81,81

I need to convert it to a matrix of order 6561 (81*81) by 2 i.e.

1=a1,1

2=a1,2

. .

81=a81,81

Any help in this regard would be greatly appreciated. Thanks in advance.

[Image Analyst]

I don't know what that means. Please give a small example, like a 4 by 4 with actual numbers of the input array and desired output array.

[Stephen23]

The first matrix has 6561 elements, the output one is shown with 81 elements. What happens to the rest of them?

[Fayyaz]

[Fayyaz]

Thanks all for your comments. Problem has been solved. :)

Answer 1

[Star Strider]

If ‘A’ is your matrix, either use the reshape function:

Av = reshape(A, [], 1);

or simply use the vector default:

Av = A(:);

EDIT — I didn’t see the repeating indices in the first column. To create them, use the repmat function:

Ix = repmat(1:81, 1, 81)';

[Fayyaz]

Both of them are OK. thanks :)

[Star Strider]

My pleasure!