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Customize Metadata When Writing Timetable Data to MDF Files
This example shows how to customize the file, channel group, and channel metadata when writing timetable data to an MDF file.
The MAT-file used in this example, MDFTimetables.mat, contains two timetables.
Timetable
TT1has variables of numeric data types including uint8, uint16, uint32, uint64, int8, int16, int32, int64, single and double.Timetable
TT2has variables of string and byte array data types including both fixed-length and variable-length data.
In this example, data in TT1 and TT2 are written into channel groups 1 and 2, respectively, of a new MDF file. You should use this advanced workflow if there is a need to customize the metadata when writing to an MDF file.
Before proceeding further in this example, you should first learn about the MDF file structure and the basic workflow demonstrated in example Get Started with Writing Timetable Data to MDF Files.
Load Timetables into Workspace
Load the timetable variables, TT1 and TT2, from MDFTimetables.mat into the workspace.
load("MDFTimetables.mat")Create a New MDF File with Customized File Metadata
Create an MDFInfo object that contains default file metadata using the function mdfInfo without input argument. Note that the displayed properties represent a subset of file metadata that are settable.
info = mdfInfo
info =
MDFInfo with properties:
File Details
Author: ""
Department: ""
Project: ""
Subject: ""
Comment: ""
Version: "4.20"
InitialTimestamp: NaT
Creator Details
CreatorUserName: ""
CreatorComment: ""
Set the Author and Comment properties to provide more information about the file.
info.Author = "Alice Author"; info.Comment = "Demonstrate how to set file metadata when creating an MDF file";
Change Version from default to "4.10".
info.Version = "4.10";Set the CreatorComment property to provide more information about the file creation.
info.CreatorComment = "Created using MATLAB for demonstration";View the updated MDFInfo object.
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"
Use the function mdfCreate with the option FileInfo to specify the updated file information object. This creates a new skeleton MDF file TimetableAdvanced.mf4 on disk. The updated metadata values are applied for the customized fields, while default values are applied for the other fields.
mdfCreate("TimetableAdvanced.mf4", FileInfo=info)ans = "/tmp/Bdoc24b_2725827_3770958/tp7650169a/vnt-ex42503333/TimetableAdvanced.mf4"
Examine the File Metadata
To confirm that the created MDF file has the correct file metadata, call mdfInfo again with the MDF file name specified, and examine the returned object.
info1 = mdfInfo("TimetableAdvanced.mf4")info1 =
MDFInfo with properties:
File Details
Name: "TimetableAdvanced.mf4"
Path: "/tmp/Bdoc24b_2725827_3770958/tp7650169a/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: 2024-09-06 03:16:50.000000000
Creator Details
ProgramIdentifier: "MATLAB"
CreatorVendorName: "The MathWorks, Inc."
CreatorToolName: "MATLAB"
CreatorToolVersion: "24.2.0.2712019 (R2024b)"
CreatorUserName: ""
CreatorComment: "Created using MATLAB for demonstration"
File Contents
Attachment: [0x7 table]
ChannelGroupCount: 0
Event: [0x8 eventtable]
Customize Channel Group Metadata and Channel Metadata
The function mdfAddChannelGroupMetadata adds default or inferred channel group metadata and channel metadata to an input timetable as custom properties, and returns the resulting timetable. Use this function to set up default metadata that serves as a basis for further customization.
Add channel group metadata and channel metadata to TT1, and assign the resulting timetable to a new variable, 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
⋮
Examine the custom properties of the new timetable. Note that the properties ChannelType, ChannelDataType, and ChannelNumBits were inferred by mdfAddChannelGroupMetadata from the data stored in the corresponding timetable variable. The remaining properties were set to default values.
The first three properties displayed are metadata that apply to the entire timetable, and the remaining properties are metadata that apply to each variable. A timetable represents a channel group, and a variable in the timetable represents a channel; then the first three properties represent channel group metadata and the rest of the properties represent channel metadata.
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]
Set the property ChannelGroupComment for the timetable, providing more information about this channel group.
TT1WithMetadata.Properties.CustomProperties.ChannelGroupComment = "This channel group contains numeric data of various types.";Set the property ChannelComment for each variable in the timetable, providing more information about each channel. You can use either the variable index or the variable name to index into the ChannelComment property.
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";
View the updated metadata for the channel group and channels.
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]
Similarly, add channel group metadata and channel metadata to TT2, and assign the resulting timetable to a new variable 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]}
Examine the custom properties of the new timetable.
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]
Set the timetable property ChannelGroupComment, providing more information about this channel group.
TT2WithMetadata.Properties.CustomProperties.ChannelGroupComment = "This channel group contains string and byte array data of both fixed and variable length.";Set the property ChannelComment for each variable in the timetable, providing more information about each channel.
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";
View the updated metadata for the channel group and channels.
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]
Write Data to MDF File with Customized Channel Group Metadata and Channel Metadata
Now TT1WithMetadata carries the data to be written into channel group 1, and the metadata to be configured for this channel group and its channels. The same is true for TT2WithMetadata.
Using mdfWrite, write the two timetables with customized metadata to the skeleton file TimetableAdvanced.mf4 created in previous steps.
mdfWrite("TimetableAdvanced.mf4", TT1WithMetadata) mdfWrite("TimetableAdvanced.mf4", TT2WithMetadata)
Examine the Channel Group Metadata
Examine metadata for the two channel groups written to TimetableAdvanced.mf4 using mdfChannelGroupInfo.
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
Examine the Channel Metadata
Examine metadata for the channels in channel group 1 using mdfChannelInfo. Specify the AdditionalMetadata option as true to view the additional metadata as well.
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
Similarly, examine the metadata for channels in channel group 2.
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
Examine the Data
To verify that data was successfully written to file, read data from both channel groups using mdfRead and examine the results.
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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