将时间表数据写入 MDF 文件时自定义元数据
此示例说明在将时间表数据写入 MDF 文件时，如何自定义文件、通道组和通道元数据。
此示例 MDFTimetables.mat 中使用的 MAT 文件包含两个时间表。
时间表
TT1具有数值数据类型的变量，包括 uint8、uint16、uint32、uint64、int8、int16、int32、int64、single 和 double。时间表
TT2具有字符串和字节数组数据类型的变量，包括固定长度和可变长度数据。
在此示例中，将 TT1 和 TT2 中的数据分别写入一个新 MDF 文件的通道组 1 和 2。如果在写入 MDF 文件时需要自定义元数据，请使用此高级工作流。
在继续此示例之前，您应首先了解 MDF 文件结构和示例 将时间表数据写入 MDF 文件的快速入门 中演示的基本工作流。
将时间表加载到工作区
将时间表变量 TT1 和 TT2，从 MDFTimetables.mat 加载到工作区。
load("MDFTimetables.mat")使用自定义文件元数据新建 MDF 文件
使用不带输入参量的函数 mdfInfo 创建一个包含默认文件元数据的 MDFInfo 对象。请注意，显示的属性表示可设置的文件元数据的子集。
info = mdfInfo
info =
MDFInfo with properties:
File Details
Author: ""
Department: ""
Project: ""
Subject: ""
Comment: ""
Version: "4.20"
InitialTimestamp: NaT
Creator Details
CreatorUserName: ""
CreatorComment: ""
设置 Author 和 Comment 属性以提供有关该文件的更多信息。
info.Author = "Alice Author"; info.Comment = "Demonstrate how to set file metadata when creating an MDF file";
将 Version 从默认值更改为 "4.10"。
info.Version = "4.10";设置 CreatorComment 属性以提供有关该文件创建的更多信息。
info.CreatorComment = "Created using MATLAB for demonstration";查看更新后的 MDFInfo 对象。
info
info =
MDFInfo with properties:
File Details
Author: "Alice Author"
Department: ""
Project: ""
Subject: ""
Comment: "Demonstrate how to set file metadata when creating an MDF file"
Version: "4.10"
InitialTimestamp: NaT
Creator Details
CreatorUserName: ""
CreatorComment: "Created using MATLAB for demonstration"
使用带有选项 FileInfo 的函数 mdfCreate 来指定更新后的文件信息对象。这将在磁盘上创建一个新的框架 MDF 文件 TimetableAdvanced.mf4。对自定义字段应用更新后的元数据值，而对其他字段应用默认值。
mdfCreate("TimetableAdvanced.mf4", FileInfo=info)ans = "/tmp/Bdoc24a_2511836_3070643/tp8879c7f7/vnt-ex42503333/TimetableAdvanced.mf4"
检查文件元数据
要确认创建的 MDF 文件具有正确的文件元数据，请使用指定的 MDF 文件名再次调用 mdfInfo，并检查返回的对象。
info1 = mdfInfo("TimetableAdvanced.mf4")info1 =
MDFInfo with properties:
File Details
Name: "TimetableAdvanced.mf4"
Path: "/tmp/Bdoc24a_2511836_3070643/tp8879c7f7/vnt-ex42503333/TimetableAdvanced.mf4"
Author: "Alice Author"
Department: ""
Project: ""
Subject: ""
Comment: "Demonstrate how to set file metadata when creating an MDF file"
Version: "4.10"
InitialTimestamp: 2024-01-26 01:57:10.000000000
Creator Details
ProgramIdentifier: "MATLAB"
CreatorVendorName: "The MathWorks, Inc."
CreatorToolName: "MATLAB"
CreatorToolVersion: "24.1.0.2498408 (R2024a) Prerelease Update 3"
CreatorUserName: ""
CreatorComment: "Created using MATLAB for demonstration"
File Contents
Attachment: [0x7 table]
ChannelGroupCount: 0
自定义通道组元数据和通道元数据
函数 mdfAddChannelGroupMetadata 将默认或推断的通道组元数据和通道元数据作为自定义属性添加到输入时间表中，并返回生成的时间表。使用此函数可设置默认元数据以作为进一步自定义的基础。
将通道组元数据和通道元数据添加到 TT1，并将生成的时间表赋给新变量 TT1WithMetadata。
TT1WithMetadata = mdfAddChannelGroupMetadata(TT1)
TT1WithMetadata=100×10 timetable
Time uint8_data uint16_data uint32_data uint64_data int8_data int16_data int32_data int64_data single_data double_data
_______ __________ ___________ ___________ ___________ _________ __________ __________ __________ ___________ ___________
0 sec 0 200 600 1400 -99 -198 -396 -794 -9.8 -19.6
0.1 sec 2 204 608 1416 -97 -194 -388 -778 -9.6 -19.2
0.2 sec 4 208 616 1432 -95 -190 -380 -762 -9.4 -18.8
0.3 sec 6 212 624 1448 -93 -186 -372 -746 -9.2 -18.4
0.4 sec 8 216 632 1464 -91 -182 -364 -730 -9 -18
0.5 sec 10 220 640 1480 -89 -178 -356 -714 -8.8 -17.6
0.6 sec 12 224 648 1496 -87 -174 -348 -698 -8.6 -17.2
0.7 sec 14 228 656 1512 -85 -170 -340 -682 -8.4 -16.8
0.8 sec 16 232 664 1528 -83 -166 -332 -666 -8.2 -16.4
0.9 sec 18 236 672 1544 -81 -162 -324 -650 -8 -16
1 sec 20 240 680 1560 -79 -158 -316 -634 -7.8 -15.6
1.1 sec 22 244 688 1576 -77 -154 -308 -618 -7.6 -15.2
1.2 sec 24 248 696 1592 -75 -150 -300 -602 -7.4 -14.8
1.3 sec 26 252 704 1608 -73 -146 -292 -586 -7.2 -14.4
1.4 sec 28 256 712 1624 -71 -142 -284 -570 -7 -14
1.5 sec 30 260 720 1640 -69 -138 -276 -554 -6.8 -13.6
⋮
检查新时间表的自定义属性。请注意，属性 ChannelType、ChannelDataType 和 ChannelNumBits 的值是由 mdfAddChannelGroupMetadata 根据存储在对应时间表变量中的数据推断得出的。其余属性设置为默认值。
显示的前三个属性是应用于整个时间表的元数据，其余属性是应用于每个变量的元数据。一个时间表表示一个通道组，该时间表中的一个变量表示一个通道；然后前三个属性表示通道组元数据，其余属性表示通道元数据。
TT1WithMetadata.Properties.CustomProperties
ans =
CustomProperties with properties:
ChannelGroupAcquisitionName: ""
ChannelGroupComment: ""
ChannelGroupSourceName: ""
ChannelGroupSourcePath: ""
ChannelGroupSourceComment: ""
ChannelGroupSourceType: Unspecified
ChannelGroupSourceBusType: Unspecified
ChannelGroupSourceBusChannelNumber: 0
ChannelDisplayName: ["" "" "" "" "" "" "" "" "" ""]
ChannelComment: ["" "" "" "" "" "" "" "" "" ""]
ChannelUnit: ["" "" "" "" "" "" "" "" "" ""]
ChannelType: [FixedLength FixedLength FixedLength FixedLength FixedLength FixedLength FixedLength FixedLength FixedLength FixedLength]
ChannelDataType: [IntegerUnsignedLittleEndian IntegerUnsignedLittleEndian IntegerUnsignedLittleEndian IntegerUnsignedLittleEndian IntegerSignedLittleEndian ... ] (1x10 asam.mdf.ChannelDataType)
ChannelNumBits: [8 16 32 64 8 16 32 64 32 64]
ChannelComponentType: [None None None None None None None None None None]
ChannelCompositionType: [None None None None None None None None None None]
ChannelSourceName: ["" "" "" "" "" "" "" "" "" ""]
ChannelSourcePath: ["" "" "" "" "" "" "" "" "" ""]
ChannelSourceComment: ["" "" "" "" "" "" "" "" "" ""]
ChannelSourceType: [Unspecified Unspecified Unspecified Unspecified Unspecified Unspecified Unspecified Unspecified Unspecified Unspecified]
ChannelSourceBusType: [Unspecified Unspecified Unspecified Unspecified Unspecified Unspecified Unspecified Unspecified Unspecified Unspecified]
ChannelSourceBusChannelNumber: [0 0 0 0 0 0 0 0 0 0]
ChannelReadOption: [Missing Missing Missing Missing Missing Missing Missing Missing Missing Missing]
设置时间表的属性 ChannelGroupComment，从而提供有关此通道组的详细信息。
TT1WithMetadata.Properties.CustomProperties.ChannelGroupComment = "This channel group contains numeric data of various types.";为时间表中的每个变量设置属性 ChannelComment，从而提供有关每个通道的详细信息。您可以使用变量索引或变量名称对 ChannelComment 属性进行索引。
TT1WithMetadata.Properties.CustomProperties.ChannelComment(1) = "Unsigned 8-bit integer"; TT1WithMetadata.Properties.CustomProperties.ChannelComment(2) = "Unsigned 16-bit integer"; TT1WithMetadata.Properties.CustomProperties.ChannelComment(3) = "Unsigned 32-bit integer"; TT1WithMetadata.Properties.CustomProperties.ChannelComment(4) = "Unsigned 64-bit integer"; TT1WithMetadata.Properties.CustomProperties.ChannelComment("int8_data") = "Signed 8-bit integer"; TT1WithMetadata.Properties.CustomProperties.ChannelComment("int16_data") = "Signed 16-bit integer"; TT1WithMetadata.Properties.CustomProperties.ChannelComment("int32_data") = "Signed 32-bit integer"; TT1WithMetadata.Properties.CustomProperties.ChannelComment("int64_data") = "Signed 64-bit integer"; TT1WithMetadata.Properties.CustomProperties.ChannelComment(9) = "32-bit floating-point number"; TT1WithMetadata.Properties.CustomProperties.ChannelComment(10) = "64-bit floating-point number";
查看通道组和通道的更新后的元数据。
TT1WithMetadata.Properties.CustomProperties
ans =
CustomProperties with properties:
ChannelGroupAcquisitionName: ""
ChannelGroupComment: "This channel group contains numeric data of various types."
ChannelGroupSourceName: ""
ChannelGroupSourcePath: ""
ChannelGroupSourceComment: ""
ChannelGroupSourceType: Unspecified
ChannelGroupSourceBusType: Unspecified
ChannelGroupSourceBusChannelNumber: 0
ChannelDisplayName: ["" "" "" "" "" "" "" "" "" ""]
ChannelComment: ["Unsigned 8-bit integer" "Unsigned 16-bit integer" "Unsigned 32-bit integer" "Unsigned 64-bit integer" "Signed 8-bit integer" "Signed 16-bit integer" ... ] (1x10 string)
ChannelUnit: ["" "" "" "" "" "" "" "" "" ""]
ChannelType: [FixedLength FixedLength FixedLength FixedLength FixedLength FixedLength FixedLength FixedLength FixedLength FixedLength]
ChannelDataType: [IntegerUnsignedLittleEndian IntegerUnsignedLittleEndian IntegerUnsignedLittleEndian IntegerUnsignedLittleEndian IntegerSignedLittleEndian ... ] (1x10 asam.mdf.ChannelDataType)
ChannelNumBits: [8 16 32 64 8 16 32 64 32 64]
ChannelComponentType: [None None None None None None None None None None]
ChannelCompositionType: [None None None None None None None None None None]
ChannelSourceName: ["" "" "" "" "" "" "" "" "" ""]
ChannelSourcePath: ["" "" "" "" "" "" "" "" "" ""]
ChannelSourceComment: ["" "" "" "" "" "" "" "" "" ""]
ChannelSourceType: [Unspecified Unspecified Unspecified Unspecified Unspecified Unspecified Unspecified Unspecified Unspecified Unspecified]
ChannelSourceBusType: [Unspecified Unspecified Unspecified Unspecified Unspecified Unspecified Unspecified Unspecified Unspecified Unspecified]
ChannelSourceBusChannelNumber: [0 0 0 0 0 0 0 0 0 0]
ChannelReadOption: [Missing Missing Missing Missing Missing Missing Missing Missing Missing Missing]
同样，将通道组元数据和通道元数据添加到 TT2，并将生成的时间表赋给新变量 TT2WithMetadata。
TT2WithMetadata = mdfAddChannelGroupMetadata(TT2)
TT2WithMetadata=10×4 timetable
Time fixed_length_string_data fixed_length_byte_array_data variable_length_string_data variable_length_byte_array_data
_____ ________________________ ____________________________ ___________________________ _______________________________
0 sec "abcd" {[255 255 255 255 255]} "zero" {[ 255 255]}
1 sec "efgh" {[ 18 35 52 69 86]} "one" {[ 18 35 52 69 86]}
2 sec "ijkl" {[ 0 1 2 3 4]} "two" {[ 0 1 2 3 4 5 6 7]}
3 sec "mnop" {[ 4 3 2 1 0]} "three" {[ 4 3 2 1 0]}
4 sec "qrst" {[255 254 253 252 251]} "four" {[ 253 252 251]}
5 sec "uvwx" {[250 249 248 247 246]} "five" {[250 249 248 247 246]}
6 sec "yzAB" {[245 244 243 242 241]} "six" {[245 244 243 242 241]}
7 sec "CDEF" {[240 239 238 237 236]} "seven" {[ 240 238 236]}
8 sec "GHIJ" {[235 234 233 232 231]} "eight" {[ 235 233 231]}
9 sec "KLMN" {[255 255 255 255 255]} "nine" {[255 255 255 255 255]}
检查新时间表的自定义属性。
TT2WithMetadata.Properties.CustomProperties
ans =
CustomProperties with properties:
ChannelGroupAcquisitionName: ""
ChannelGroupComment: ""
ChannelGroupSourceName: ""
ChannelGroupSourcePath: ""
ChannelGroupSourceComment: ""
ChannelGroupSourceType: Unspecified
ChannelGroupSourceBusType: Unspecified
ChannelGroupSourceBusChannelNumber: 0
ChannelDisplayName: ["" "" "" ""]
ChannelComment: ["" "" "" ""]
ChannelUnit: ["" "" "" ""]
ChannelType: [FixedLength FixedLength VariableLength VariableLength]
ChannelDataType: [StringASCII ByteArray StringASCII ByteArray]
ChannelNumBits: [40 40 64 64]
ChannelComponentType: [None None None None]
ChannelCompositionType: [None None None None]
ChannelSourceName: ["" "" "" ""]
ChannelSourcePath: ["" "" "" ""]
ChannelSourceComment: ["" "" "" ""]
ChannelSourceType: [Unspecified Unspecified Unspecified Unspecified]
ChannelSourceBusType: [Unspecified Unspecified Unspecified Unspecified]
ChannelSourceBusChannelNumber: [0 0 0 0]
ChannelReadOption: [Missing Missing Missing Missing]
设置时间表属性 ChannelGroupComment,，从而提供有关此通道组的详细信息。
TT2WithMetadata.Properties.CustomProperties.ChannelGroupComment = "This channel group contains string and byte array data of both fixed and variable length.";为时间表中的每个变量设置属性 ChannelComment，从而提供有关每个通道的详细信息。
TT2WithMetadata.Properties.CustomProperties.ChannelComment(1) = "String data where each sample has the same number of characters"; TT2WithMetadata.Properties.CustomProperties.ChannelComment(2) = "Byte array data where each sample has the same number of bytes"; TT2WithMetadata.Properties.CustomProperties.ChannelComment(3) = "String data where samples have varying numbers of characters"; TT2WithMetadata.Properties.CustomProperties.ChannelComment(4) = "Byte array data where samples have varying numbers of bytes";
查看通道组和通道的更新后的元数据。
TT2WithMetadata.Properties.CustomProperties
ans =
CustomProperties with properties:
ChannelGroupAcquisitionName: ""
ChannelGroupComment: "This channel group contains string and byte array data of both fixed and variable length."
ChannelGroupSourceName: ""
ChannelGroupSourcePath: ""
ChannelGroupSourceComment: ""
ChannelGroupSourceType: Unspecified
ChannelGroupSourceBusType: Unspecified
ChannelGroupSourceBusChannelNumber: 0
ChannelDisplayName: ["" "" "" ""]
ChannelComment: ["String data where each sample has the same number of characters" "Byte array data where each sample has the same number of bytes" ... ] (1x4 string)
ChannelUnit: ["" "" "" ""]
ChannelType: [FixedLength FixedLength VariableLength VariableLength]
ChannelDataType: [StringASCII ByteArray StringASCII ByteArray]
ChannelNumBits: [40 40 64 64]
ChannelComponentType: [None None None None]
ChannelCompositionType: [None None None None]
ChannelSourceName: ["" "" "" ""]
ChannelSourcePath: ["" "" "" ""]
ChannelSourceComment: ["" "" "" ""]
ChannelSourceType: [Unspecified Unspecified Unspecified Unspecified]
ChannelSourceBusType: [Unspecified Unspecified Unspecified Unspecified]
ChannelSourceBusChannelNumber: [0 0 0 0]
ChannelReadOption: [Missing Missing Missing Missing]
使用自定义通道组元数据和通道元数据将数据写入 MDF 文件
现在，TT1WithMetadata 携带要写入通道组 1 的数据，并且携带要为此通道组及其通道配置的元数据。TT2WithMetadata 同样如此。
使用 mdfWrite 将具有自定义元数据的两个时间表写入在前面的步骤中创建的框架文件 TimetableAdvanced.mf4。
mdfWrite("TimetableAdvanced.mf4", TT1WithMetadata) mdfWrite("TimetableAdvanced.mf4", TT2WithMetadata)
检查通道组元数据
使用 mdfChannelGroupInfo 检查写入 TimetableAdvanced.mf4 的两个通道组的元数据。
chanGrpInfo = mdfChannelGroupInfo("TimetableAdvanced.mf4")chanGrpInfo=2×13 table
GroupNumber AcquisitionName Comment NumSamples DataSize Sorted SourceName SourcePath SourceComment SourceType SourceBusType SourceBusChannelNumber SourceSimulated
___________ _______________ _________________________________________________________________________________________ __________ ________ ______ ___________ ___________ _____________ ___________ _____________ ______________________ _______________
1 <undefined> This channel group contains numeric data of various types. 100 5000 true <undefined> <undefined> <undefined> Unspecified Unspecified 0 false
2 <undefined> This channel group contains string and byte array data of both fixed and variable length. 10 340 true <undefined> <undefined> <undefined> Unspecified Unspecified 0 false
检查通道元数据
使用 mdfChannelInfo 检查通道组 1 中通道的元数据。将 AdditionalMetadata 选项指定为 true 可以查看其他元数据。
chanGrp1Info = mdfChannelInfo("TimetableAdvanced.mf4", GroupNumber=1, AdditionalMetadata=true)chanGrp1Info=11×25 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
_____________ ___________ _______________ ____________________ __________________________________________________________ _______________ _______________ ___________ ___________ ____________________________ __________________ ___________ ___________ ___________ ________ ___________________________ _______ _____________ _______________ ______________ _____________ ___________ _____________ ______________________ _______________
"Time" 1 100 <undefined> This channel group contains numeric data of various types. <undefined> <undefined> "" s <undefined> <undefined> <undefined> <undefined> Master Time RealLittleEndian 64 None None Unspecified "" Unspecified Unspecified 0 false
"double_data" 1 100 <undefined> This channel group contains numeric data of various types. <undefined> <undefined> "" <undefined> 64-bit floating-point number <undefined> <undefined> <undefined> FixedLength None RealLittleEndian 64 None None Unspecified "" Unspecified Unspecified 0 false
"int16_data" 1 100 <undefined> This channel group contains numeric data of various types. <undefined> <undefined> "" <undefined> Signed 16-bit integer <undefined> <undefined> <undefined> FixedLength None IntegerSignedLittleEndian 16 None None Unspecified "" Unspecified Unspecified 0 false
"int32_data" 1 100 <undefined> This channel group contains numeric data of various types. <undefined> <undefined> "" <undefined> Signed 32-bit integer <undefined> <undefined> <undefined> FixedLength None IntegerSignedLittleEndian 32 None None Unspecified "" Unspecified Unspecified 0 false
"int64_data" 1 100 <undefined> This channel group contains numeric data of various types. <undefined> <undefined> "" <undefined> Signed 64-bit integer <undefined> <undefined> <undefined> FixedLength None IntegerSignedLittleEndian 64 None None Unspecified "" Unspecified Unspecified 0 false
"int8_data" 1 100 <undefined> This channel group contains numeric data of various types. <undefined> <undefined> "" <undefined> Signed 8-bit integer <undefined> <undefined> <undefined> FixedLength None IntegerSignedLittleEndian 8 None None Unspecified "" Unspecified Unspecified 0 false
"single_data" 1 100 <undefined> This channel group contains numeric data of various types. <undefined> <undefined> "" <undefined> 32-bit floating-point number <undefined> <undefined> <undefined> FixedLength None RealLittleEndian 32 None None Unspecified "" Unspecified Unspecified 0 false
"uint16_data" 1 100 <undefined> This channel group contains numeric data of various types. <undefined> <undefined> "" <undefined> Unsigned 16-bit integer <undefined> <undefined> <undefined> FixedLength None IntegerUnsignedLittleEndian 16 None None Unspecified "" Unspecified Unspecified 0 false
"uint32_data" 1 100 <undefined> This channel group contains numeric data of various types. <undefined> <undefined> "" <undefined> Unsigned 32-bit integer <undefined> <undefined> <undefined> FixedLength None IntegerUnsignedLittleEndian 32 None None Unspecified "" Unspecified Unspecified 0 false
"uint64_data" 1 100 <undefined> This channel group contains numeric data of various types. <undefined> <undefined> "" <undefined> Unsigned 64-bit integer <undefined> <undefined> <undefined> FixedLength None IntegerUnsignedLittleEndian 64 None None Unspecified "" Unspecified Unspecified 0 false
"uint8_data" 1 100 <undefined> This channel group contains numeric data of various types. <undefined> <undefined> "" <undefined> Unsigned 8-bit integer <undefined> <undefined> <undefined> FixedLength None IntegerUnsignedLittleEndian 8 None None Unspecified "" Unspecified Unspecified 0 false
同样，检查通道组 2 中通道的元数据。
chanGrp2Info = mdfChannelInfo("TimetableAdvanced.mf4", GroupNumber=2, AdditionalMetadata=true)chanGrp2Info=5×25 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
_________________________________ ___________ _______________ ____________________ _________________________________________________________________________________________ _______________ _______________ ___________ ___________ _______________________________________________________________ __________________ ___________ ___________ ______________ ________ ________________ _______ _____________ _______________ ______________ _____________ ___________ _____________ ______________________ _______________
"Time" 2 10 <undefined> This channel group contains string and byte array data of both fixed and variable length. <undefined> <undefined> "" s <undefined> <undefined> <undefined> <undefined> Master Time RealLittleEndian 64 None None Unspecified "" Unspecified Unspecified 0 false
"fixed_length_byte_array_data" 2 10 <undefined> This channel group contains string and byte array data of both fixed and variable length. <undefined> <undefined> "" <undefined> Byte array data where each sample has the same number of bytes <undefined> <undefined> <undefined> FixedLength None ByteArray 40 None None Unspecified "" Unspecified Unspecified 0 false
"fixed_length_string_data" 2 10 <undefined> This channel group contains string and byte array data of both fixed and variable length. <undefined> <undefined> "" <undefined> String data where each sample has the same number of characters <undefined> <undefined> <undefined> FixedLength None StringASCII 40 None None Unspecified "" Unspecified Unspecified 0 false
"variable_length_byte_array_data" 2 10 <undefined> This channel group contains string and byte array data of both fixed and variable length. <undefined> <undefined> "" <undefined> Byte array data where samples have varying numbers of bytes <undefined> <undefined> <undefined> VariableLength None ByteArray 64 None None Unspecified "" Unspecified Unspecified 0 false
"variable_length_string_data" 2 10 <undefined> This channel group contains string and byte array data of both fixed and variable length. <undefined> <undefined> "" <undefined> String data where samples have varying numbers of characters <undefined> <undefined> <undefined> VariableLength None StringASCII 64 None None Unspecified "" Unspecified Unspecified 0 false
检查数据
要验证数据是否已成功写入文件，请使用 mdfRead 从两个通道组读取数据并检查结果。
data = mdfRead("TimetableAdvanced.mf4")data=2×1 cell array
{100x10 timetable}
{ 10x4 timetable}
chanGrp1Data = data{1}chanGrp1Data=100×10 timetable
Time uint8_data uint16_data uint32_data uint64_data int8_data int16_data int32_data int64_data single_data double_data
_______ __________ ___________ ___________ ___________ _________ __________ __________ __________ ___________ ___________
0 sec 0 200 600 1400 -99 -198 -396 -794 -9.8 -19.6
0.1 sec 2 204 608 1416 -97 -194 -388 -778 -9.6 -19.2
0.2 sec 4 208 616 1432 -95 -190 -380 -762 -9.4 -18.8
0.3 sec 6 212 624 1448 -93 -186 -372 -746 -9.2 -18.4
0.4 sec 8 216 632 1464 -91 -182 -364 -730 -9 -18
0.5 sec 10 220 640 1480 -89 -178 -356 -714 -8.8 -17.6
0.6 sec 12 224 648 1496 -87 -174 -348 -698 -8.6 -17.2
0.7 sec 14 228 656 1512 -85 -170 -340 -682 -8.4 -16.8
0.8 sec 16 232 664 1528 -83 -166 -332 -666 -8.2 -16.4
0.9 sec 18 236 672 1544 -81 -162 -324 -650 -8 -16
1 sec 20 240 680 1560 -79 -158 -316 -634 -7.8 -15.6
1.1 sec 22 244 688 1576 -77 -154 -308 -618 -7.6 -15.2
1.2 sec 24 248 696 1592 -75 -150 -300 -602 -7.4 -14.8
1.3 sec 26 252 704 1608 -73 -146 -292 -586 -7.2 -14.4
1.4 sec 28 256 712 1624 -71 -142 -284 -570 -7 -14
1.5 sec 30 260 720 1640 -69 -138 -276 -554 -6.8 -13.6
⋮
chanGrp2Data = data{2}chanGrp2Data=10×4 timetable
Time fixed_length_string_data fixed_length_byte_array_data variable_length_string_data variable_length_byte_array_data
_____ ________________________ ____________________________ ___________________________ _______________________________
0 sec "abcd" {[255 255 255 255 255]} "zero" {[ 255 255]}
1 sec "efgh" {[ 18 35 52 69 86]} "one" {[ 18 35 52 69 86]}
2 sec "ijkl" {[ 0 1 2 3 4]} "two" {[ 0 1 2 3 4 5 6 7]}
3 sec "mnop" {[ 4 3 2 1 0]} "three" {[ 4 3 2 1 0]}
4 sec "qrst" {[255 254 253 252 251]} "four" {[ 253 252 251]}
5 sec "uvwx" {[250 249 248 247 246]} "five" {[250 249 248 247 246]}
6 sec "yzAB" {[245 244 243 242 241]} "six" {[245 244 243 242 241]}
7 sec "CDEF" {[240 239 238 237 236]} "seven" {[ 240 238 236]}
8 sec "GHIJ" {[235 234 233 232 231]} "eight" {[ 235 233 231]}
9 sec "KLMN" {[255 255 255 255 255]} "nine" {[255 255 255 255 255]}
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