Writes the data to be output to the device buffer
        
        :param output: data to output
        :type output: numpy.ndarray

def write(self,output):
        """Writes the data to be output to the device buffer
        
        :param output: data to output
        :type output: numpy.ndarray
        """
        w = c_int32()
        self.WriteAnalogF64(self.npoints, 0, 10.0, DAQmx_Val_GroupByChannel,
                            output, w, None);