If a = 3*3 Matrix then how do I index row 1,2,3 & column 1,3 ?

A =
  0.8147    0.9134    0.2785
  0.9058    0.6324    0.5469
  0.1270    0.0975    0.9575

>> A(2:2,2:3)
ans =
  0.6324    0.5469

>> A(2:3,2:3)
ans =
  0.6324    0.5469
  0.0975    0.9575

>> A(3:3,3:3)
ans =
  0.9575

>> A(1:3,3:3)
ans =
  0.2785
  0.5469
  0.9575

>> A(1:3,1 3)
A(1:3,1 3)
Error: Unexpected MATLAB expression.

>>  A(1:3,1:3)
ans =
  0.8147    0.9134    0.2785
  0.9058    0.6324    0.5469
  0.1270    0.0975    0.9575

>> A(1:3,1;3)
A(1:3,1;3)
Error: Unbalanced or unexpected parenthesis or bracket.

Answer 1

[bio lim]

A(:, [1,3])