def is_gray(self):
return (alltrue(self._lut[:, 0] == self._lut[:, 1])
and alltrue(self._lut[:, 0] == self._lut[:, 2]))
def _is_sorted(self, x):
"return true if x is sorted"
if len(x)<2: return 1
return alltrue(x[1:]-x[0:-1]>=0)
def is_gray(self):
return (alltrue(self._lut[:,0] == self._lut[:,1])
and alltrue(self._lut[:,0] == self._lut[:,2]))
