MAT-File Format - SERC

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1 MAT-File FormatLevel 5 MATLAB Array Data Element FormatsThe MAT-file data type miMATRIX (14) is used to represent all types of MATLABarrays, including:• Numeric arrays• Character arrays• Sparse arrays• Cell arrays• Structures• ObjectsThe miMATRIX data type is a compound data type. MAT-file data elements ofthis type are composed of multiple subelements. The subelements can be of anyother MAT-file data type, including other miMATRIX data types.Figure 1-5 shows a miMATRIX data element composed of three subelements.Note how each subelement is a data element with its own tag. The value of theNumber of Bytes field (96 in the figure) in the data element tag includes all thesubelements.Figure 1-5: MATLAB Array Data Element with Subelements96 bytesBytes 1 2 3 4 5 6 7 8miMATRIXTagDataTagDataTagData96 TagSub-ElementSub-ElementSubelementData Element1-14
Level 5 MATLAB Array Data Element FormatsEach miMATRIX data element representing the different types of MATLABarrays each has a specific set of subelements. Some of these subelements arecommon to all MATLAB arrays. Others subelements are unique to a particulartype of array. The following sections detail the subelements for each MATLABarray type.Numeric Array and Character Array Data ElementFormatsA MAT-file data element representing a MATLAB numeric array or characterarray is composed of four subelements and one optional subelement. Table 1-2lists the subelements in the order in which they appear in the data element.The table also includes the values of the Data Type and Number of Bytes fieldsyou would use in the tag of each subelement. For an example, see “Examples ofNumeric Array Data Elements” on page 1-19.Table 1-2: Numeric and Character Array Subelements with Tag DataSubelement Data Type Number of BytesArray Flags miUINT32 2*size-of-Data-Type (8 bytes)Dimensions Array miINT32 number-of-dimensions*size-of-Data-Type(To learn how to determine the number ofdimensions, see “Dimensions Array Subelement”on page 1-17.)Array Name miINT8 number-of-characters*size-of-Data-TypeReal part (pr)Imaginary part (pi)(Optional)Any of the numericdata types.Any of the numericdata types.number-of-values*size-of-Data-Typenumber-of-values*size-of-Data-TypeArray Flags SubelementThis subelement identifies the MATLAB array type (class) represented by thedata element and provides other information about the array. The Array Flagssubelement is common to all array types.1-15
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Page 46 and 47: IndexHheaderdefined 1-4flag fields
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MAT-File Format - SERC

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