title: how to select/replace all elements of a row/columns in a matrix?
body: <p>I know in matlab we can do <code>Matrix(1,:)</code>, and it gives us all the elements  of the first row for all the columns.
  Is there anyway to do that in c++?
  Like if I have <code>int Matrix[3][3]={{1,1,1},{2,2,2},{3,3,3}};</code> how I can get/or replace <code>{1,1,1}</code> all together?</p>