title: Function that checks if there is a column in a 2D array in which all values are equal?
body: <p>I have a 2D array that includes data about 14 days and the temperature changes every hour during each day (the matrix is 14x24= 336 data points).
  I would like to know if there is a function/command that checks if there is a column in the 2D array in which all values are equal?
  Thanks!</p>