def test_add_scaling(self):
""" Test scaling that adds two input scalings"""
tdms_obj = TdmsObject("/'group'/'channel'")
tdms_obj._scaler_data = {
0: np.array([1.0, 2.0, 3.0]),
1: np.array([2.0, 4.0, 6.0]),
}
expected_scaled_data = np.array([3.0, 6.0, 9.0])
tdms_obj.properties["NI_Number_Of_Scales"] = 3
tdms_obj.properties["NI_Scale[2]_Scale_Type"] = "Add"
tdms_obj.properties["NI_Scale[2]_Add_Left_Operand_Input_Source"] = 0
tdms_obj.properties["NI_Scale[2]_Add_Right_Operand_Input_Source"] = 1
np.testing.assert_almost_equal(expected_scaled_data, tdms_obj.data)
def test_subtract_scaling(self):
""" Test scaling that subtracts an input scaling from another"""
# This behaves the opposite to what you'd expect, the left operand
# is subtracted from the right operand.
tdms_obj = TdmsObject("/'group'/'channel'")
tdms_obj._scaler_data = {
0: np.array([1.0, 2.0, 3.0]),
1: np.array([2.0, 4.0, 6.0]),
}
expected_scaled_data = np.array([1.0, 2.0, 3.0])
tdms_obj.properties["NI_Number_Of_Scales"] = 3
tdms_obj.properties["NI_Scale[2]_Scale_Type"] = "Subtract"
tdms_obj.properties[
"NI_Scale[2]_Subtract_Left_Operand_Input_Source"] = 0
tdms_obj.properties[
"NI_Scale[2]_Subtract_Right_Operand_Input_Source"] = 1
np.testing.assert_almost_equal(expected_scaled_data, tdms_obj.data)