Hi,
I understand that you are trying to read both the raw data as well as the converted data (called as physical data) using a single read of the file. And then you want to map the corresponding raw and physical data of a signal.
Either Properties or Properties.CustomProperties does not have the conversions stored
I tried the following approach to check if such converted data is available in the Properties or Properties.CustomProperties of the returned table.
openExample('vnt/ReadingDataWithConversionFromAnMDFFileExample')
mdfObj = mdf("MDF_Conversion_Example.mf4");
data = read(mdfObj,1,"Gear position",IncludeMetadata=true) %Reading "Gear Position" channel data without conversion
Output of the table
data =
5×1 timetable
Time GearPosition
________ ____________
0 sec 2
0.25 sec 3
0.5 sec 0
0.75 sec 2
1 sec 1
Now, reading with conversion enabled as seen below
data_all = read(mdfObj, 1, "Gear position", IncludeMetadata=true, Conversion="All") %Reading with Conversion enabled
data_all =
5×1 timetable
Time GearPosition
________ ___________________
0 sec {'Gear position 2'}
0.25 sec {'Gear position 3'}
0.5 sec {'Invalid' }
0.75 sec {'Gear position 2'}
1 sec {'Gear position 1'}
Next, the I anlayzed the Properties and Properties.CustomProperties of the table.
data_all.Properties.CustomProperties
ans =
CustomProperties with properties:
ChannelGroupAcquisitionName: "Signal with conversions"
ChannelGroupComment: ""
ChannelGroupSourceInfo: [1×1 struct]
ChannelDisplayName: ""
ChannelComment: ""
ChannelUnit: ""
ChannelType: FixedLength
ChannelDataType: IntegerUnsignedLittleEndian
ChannelNumBits: 8
ChannelComponentType: None
ChannelCompositionType: None
ChannelSourceInfo: [1×1 struct]
ChannelReadOption: All
data_all.Properties
ans =
TimetableProperties with properties:
Description: 'Signal with conversions'
UserData: []
DimensionNames: {'Time' 'Variables'}
VariableNames: {'GearPosition'}
VariableDescriptions: {'Gear position'}
VariableUnits: {''}
VariableContinuity: []
RowTimes: [5×1 duration]
StartTime: 0 sec
SampleRate: 4
TimeStep: 0.25 sec
Events: []
Custom Properties (access using t.Properties.CustomProperties.<name>):
ChannelGroupAcquisitionName: "Signal with conversions"
ChannelGroupComment: ""
ChannelGroupSourceInfo: [1×1 struct]
ChannelDisplayName: ""
ChannelComment: ""
ChannelUnit: ""
ChannelType: FixedLength
ChannelDataType: IntegerUnsignedLittleEndian
ChannelNumBits: 8
ChannelComponentType: None
ChannelCompositionType: None
ChannelSourceInfo: [1×1 struct]
ChannelReadOption: All
For more information about different ways of reading MDF files, please refer to the MDF file documentation - https://www.mathworks.com/help/vnt/referencelist.html?type=function&category=mdf-files
