code: function powColVector(x, power) {
                  var result = x.clone();
                  for (var i = 0; i < x.rows; ++i) {
                      result[i][0] = Math.pow(result[i][0], power);
                  }
                  return result;
              }
docs: Function that given a column vector return this: vector^power
  
  @param x - Column vector.
  @param power - Pow number.
  @return {Suite|Matrix}