title: Computing min and max values of a matrix
body: <p>This question might be closed as it sounds vague but I'm really asking this because I have no idea or my math background is not sufficient enough. </p>
  
  <p>I'm trying to implement a challenge and a part of the challenge requires me to compute min and max values of a matrix. I have no trouble with matrix implementations and its operations however <b>what</b> is the min and max values of a matrix? Considering a 3x3 matrix is the min the smallest number among 9 numbers and max is the greatest or something else? </p>