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MDF ファイル入門
この例では、MDF ファイルとその内容に関する情報にアクセスする方法を示します。
ファイルの詳細を表示
ファイル名を指定して mdfInfo を使用して MDF ファイルのメタデータを表示します。このサンプル ファイルは、Vehicle Network Toolbox ™ を使用して MATLAB ® から作成されました。
fileInfo = mdfInfo("VehicleData.mf4")fileInfo =
MDFInfo with properties:
File Details
Name: "VehicleData.mf4"
Path: "/tmp/Bdoc25a_2864802_1971459/tpcbc94420/vnt-ex51113426/VehicleData.mf4"
Author: "Engineer"
Department: "Automotive"
Project: "Demo"
Subject: "Prototype"
Comment: "Example file"
Version: "4.20"
InitialTimestamp: 2024-11-14 19:16:35.000000000
Creator Details
ProgramIdentifier: "MATLAB"
CreatorVendorName: "The MathWorks, Inc."
CreatorToolName: "MATLAB"
CreatorToolVersion: "25.1.0.2768609 (R2025a) Prerelease"
CreatorUserName: "engineer"
CreatorComment: "Created with Vehicle Network Toolbox"
File Contents
Attachment: [1×7 table]
ChannelGroupCount: 2
Event: [0×8 eventtable]
MDF ファイルに関する基本的な詳細は、セクション File Details のプロパティとして利用できます。
元のツールに関する情報は、セクション Creator Details に記載されています。
添付ファイル、チャネル グループ、イベントの詳細については、セクション File Contents に記載されています。
チャネル グループの詳細の表示
MDF ファイル内のデータは、チャネル グループ内のチャネルに編成されます。このサンプル ファイルには、ChannelGroupCount プロパティで示されるように 2 つのチャネル グループが含まれています。
fileInfo.ChannelGroupCount
ans = uint64
2
mdfChannelGroupInfo を使用して 2 つのチャネル グループの詳細を表示します。
chanGrpInfo = mdfChannelGroupInfo("VehicleData.mf4")chanGrpInfo=2×13 table
GroupNumber AcquisitionName Comment NumSamples DataSize Sorted SourceName SourcePath SourceComment SourceType SourceBusType SourceBusChannelNumber SourceSimulated
___________ _______________ ___________________________________________________________________________ __________ ________ ______ ___________ ___________ _____________ ___________ _____________ ______________________ _______________
1 <undefined> Simulation of an automatic transmission controller during passing maneuver. 751 43558 true <undefined> <undefined> <undefined> Unspecified Unspecified 0 false
2 <undefined> Simulation of engine gas dynamics. 92033 2208792 true <undefined> <undefined> <undefined> Unspecified Unspecified 0 false
チャネルの詳細を見る
この MDF ファイル内のすべてのチャネルの詳細を表示するには、mdfChannelInfo を使用します。
chanInfoDefault = mdfChannelInfo("VehicleData.mf4")chanInfoDefault=12×13 table
Name GroupNumber GroupNumSamples GroupAcquisitionName GroupComment GroupSourceName GroupSourcePath DisplayName Unit Comment ExtendedNamePrefix SourceName SourcePath
_________________ ___________ _______________ ____________________ ___________________________________________________________________________ _______________ _______________ ___________ ___________ ___________ __________________ ___________ ___________
"AirFlow" 2 92033 <undefined> Simulation of engine gas dynamics. <undefined> <undefined> "" g/s <undefined> <undefined> <undefined> <undefined>
"Brake" 1 751 <undefined> Simulation of an automatic transmission controller during passing maneuver. <undefined> <undefined> "" ft*lbf <undefined> <undefined> <undefined> <undefined>
"EngineRPM" 1 751 <undefined> Simulation of an automatic transmission controller during passing maneuver. <undefined> <undefined> "" rpm <undefined> <undefined> <undefined> <undefined>
"FuelRate" 2 92033 <undefined> Simulation of engine gas dynamics. <undefined> <undefined> "" g/s <undefined> <undefined> <undefined> <undefined>
"Gear" 1 751 <undefined> Simulation of an automatic transmission controller during passing maneuver. <undefined> <undefined> "" <undefined> <undefined> <undefined> <undefined> <undefined>
"ImpellerTorque" 1 751 <undefined> Simulation of an automatic transmission controller during passing maneuver. <undefined> <undefined> "" ft*lbf <undefined> <undefined> <undefined> <undefined>
"OutputTorque" 1 751 <undefined> Simulation of an automatic transmission controller during passing maneuver. <undefined> <undefined> "" ft*lbf <undefined> <undefined> <undefined> <undefined>
"Throttle" 1 751 <undefined> Simulation of an automatic transmission controller during passing maneuver. <undefined> <undefined> "" % <undefined> <undefined> <undefined> <undefined>
"TransmissionRPM" 1 751 <undefined> Simulation of an automatic transmission controller during passing maneuver. <undefined> <undefined> "" rpm <undefined> <undefined> <undefined> <undefined>
"VehicleSpeed" 1 751 <undefined> Simulation of an automatic transmission controller during passing maneuver. <undefined> <undefined> "" mph <undefined> <undefined> <undefined> <undefined>
"time" 1 751 <undefined> Simulation of an automatic transmission controller during passing maneuver. <undefined> <undefined> "" s <undefined> <undefined> <undefined> <undefined>
"time" 2 92033 <undefined> Simulation of engine gas dynamics. <undefined> <undefined> "" s <undefined> <undefined> <undefined> <undefined>
デフォルトでは、この関数は最小限のチャネル メタデータを返します。追加のメタデータを表示するには、AdditionalMetadata オプションを true に設定します。
chanInfoAdditional = mdfChannelInfo("VehicleData.mf4", AdditionalMetadata=true)chanInfoAdditional=12×25 table
Name GroupNumber GroupNumSamples GroupAcquisitionName GroupComment GroupSourceName GroupSourcePath DisplayName Unit Comment ExtendedNamePrefix SourceName SourcePath Type SyncType DataType NumBits ComponentType CompositionType ConversionType SourceComment SourceType SourceBusType SourceBusChannelNumber SourceSimulated
_________________ ___________ _______________ ____________________ ___________________________________________________________________________ _______________ _______________ ___________ ___________ ___________ __________________ ___________ ___________ ___________ ________ ___________________________ _______ _____________ _______________ ______________ _____________ ___________ _____________ ______________________ _______________
"AirFlow" 2 92033 <undefined> Simulation of engine gas dynamics. <undefined> <undefined> "" g/s <undefined> <undefined> <undefined> <undefined> FixedLength None RealLittleEndian 64 None None Unspecified "" Unspecified Unspecified 0 false
"Brake" 1 751 <undefined> Simulation of an automatic transmission controller during passing maneuver. <undefined> <undefined> "" ft*lbf <undefined> <undefined> <undefined> <undefined> FixedLength None IntegerUnsignedLittleEndian 8 None None Unspecified "" Unspecified Unspecified 0 false
"EngineRPM" 1 751 <undefined> Simulation of an automatic transmission controller during passing maneuver. <undefined> <undefined> "" rpm <undefined> <undefined> <undefined> <undefined> FixedLength None RealLittleEndian 64 None None Unspecified "" Unspecified Unspecified 0 false
"FuelRate" 2 92033 <undefined> Simulation of engine gas dynamics. <undefined> <undefined> "" g/s <undefined> <undefined> <undefined> <undefined> FixedLength None RealLittleEndian 64 None None Unspecified "" Unspecified Unspecified 0 false
"Gear" 1 751 <undefined> Simulation of an automatic transmission controller during passing maneuver. <undefined> <undefined> "" <undefined> <undefined> <undefined> <undefined> <undefined> FixedLength None IntegerUnsignedLittleEndian 8 None None Unspecified "" Unspecified Unspecified 0 false
"ImpellerTorque" 1 751 <undefined> Simulation of an automatic transmission controller during passing maneuver. <undefined> <undefined> "" ft*lbf <undefined> <undefined> <undefined> <undefined> FixedLength None RealLittleEndian 64 None None Unspecified "" Unspecified Unspecified 0 false
"OutputTorque" 1 751 <undefined> Simulation of an automatic transmission controller during passing maneuver. <undefined> <undefined> "" ft*lbf <undefined> <undefined> <undefined> <undefined> FixedLength None RealLittleEndian 64 None None Unspecified "" Unspecified Unspecified 0 false
"Throttle" 1 751 <undefined> Simulation of an automatic transmission controller during passing maneuver. <undefined> <undefined> "" % <undefined> <undefined> <undefined> <undefined> FixedLength None RealLittleEndian 64 None None Unspecified "" Unspecified Unspecified 0 false
"TransmissionRPM" 1 751 <undefined> Simulation of an automatic transmission controller during passing maneuver. <undefined> <undefined> "" rpm <undefined> <undefined> <undefined> <undefined> FixedLength None RealLittleEndian 64 None None Unspecified "" Unspecified Unspecified 0 false
"VehicleSpeed" 1 751 <undefined> Simulation of an automatic transmission controller during passing maneuver. <undefined> <undefined> "" mph <undefined> <undefined> <undefined> <undefined> FixedLength None RealLittleEndian 64 None None Unspecified "" Unspecified Unspecified 0 false
"time" 1 751 <undefined> Simulation of an automatic transmission controller during passing maneuver. <undefined> <undefined> "" s <undefined> <undefined> <undefined> <undefined> Master Time RealLittleEndian 64 None None Unspecified "" Unspecified Unspecified 0 false
"time" 2 92033 <undefined> Simulation of engine gas dynamics. <undefined> <undefined> "" s <undefined> <undefined> <undefined> <undefined> Master Time RealLittleEndian 64 None None Unspecified "" Unspecified Unspecified 0 false
MDF ファイル内のチャネルを検索する
mdfChannelInfo は、名前が完全にまたは部分的にわかっている場合、MDF ファイル内のチャネルの詳細を照会することもできます。この関数は、文字列の一致にワイルドカードをサポートするオプション Channel を提供します。
名前が「Gear」であるチャネルを検索するには:
pwmChanInfoExact = mdfChannelInfo("VehicleData.mf4", Channel="Gear")
pwmChanInfoExact=1×13 table
Name GroupNumber GroupNumSamples GroupAcquisitionName GroupComment GroupSourceName GroupSourcePath DisplayName Unit Comment ExtendedNamePrefix SourceName SourcePath
______ ___________ _______________ ____________________ ___________________________________________________________________________ _______________ _______________ ___________ ___________ ___________ __________________ ___________ ___________
"Gear" 1 751 <undefined> Simulation of an automatic transmission controller during passing maneuver. <undefined> <undefined> "" <undefined> <undefined> <undefined> <undefined> <undefined>
名前に部分文字列「RPM」が含まれるチャネルを検索するには:
pwmChanInfoWildcards = mdfChannelInfo("VehicleData.mf4", Channel="*RPM*")
pwmChanInfoWildcards=2×13 table
Name GroupNumber GroupNumSamples GroupAcquisitionName GroupComment GroupSourceName GroupSourcePath DisplayName Unit Comment ExtendedNamePrefix SourceName SourcePath
_________________ ___________ _______________ ____________________ ___________________________________________________________________________ _______________ _______________ ___________ ____ ___________ __________________ ___________ ___________
"EngineRPM" 1 751 <undefined> Simulation of an automatic transmission controller during passing maneuver. <undefined> <undefined> "" rpm <undefined> <undefined> <undefined> <undefined>
"TransmissionRPM" 1 751 <undefined> Simulation of an automatic transmission controller during passing maneuver. <undefined> <undefined> "" rpm <undefined> <undefined> <undefined> <undefined>
