title: Create inverse logical array in Matlab
body: <p>I have a logical array, isLand, that is true if the index is over land and false if the index is not over land, like the ocean. How can I easily create another logical array, isOcean, which is the inverse of isLand. All the ones in isLand will be zeros in isOcean and vice versa. </p>
  
  <p>I know I can do this using a for loop but I feel there is a much better way.</p>