Transpose of a matrix

 AT, AijT= Aji. The jith entry of A is the ijth entry of i.

For example,

A =

     1     2
     3     4

>> A'

ans =

     1     3
     2     4

When is A = AT? That is, when is the transpose of a matrix equal to itself?

[Walter Roberson]

This is not a MATLAB question

[Patrik Ek]

may I recommend maths stack exchange?

Answer 1

[Walter Roberson]

A matrix is its own transpose when it is symmetric around the main diagonal. In the case of the 2 x 2 matrix, A12 would have to equal A21