Add value some specific row or column

I have a array (257 x 257 x 3) I want to add 0.1 in only x parts(means (i,j,1)) i,j =1:257

How can i do this?

Answer 1

[Star Strider]

If ‘A’ is your array:

A = randi(9,4,5,3)                          % Original Array
A(:,:,1) = A(:,:,1)+0.1                     % Add ‘0.1’ Only To Page 1 Of ‘A’