MAT-File Format - SERC

1 MAT-File FormatSparse Array Data Element FormatA MAT-file data element representing a MATLAB sparse array is composed ofsix subelements and one optional subelement. Table 1-4 lists the subelementsin the order in which they appear in the data element. The table lists the valuesof the Data Type and Number of Bytes fields of the tag for each subelement.Table 1-4: Sparse 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-Typewhere number-of-dimensions can be 0, 1 or 2.Array Name miINT8 number-of-characters*size-of-Data-TypeRow Index (ir) miINT32 nzmax*size-of-Data-Type(The nzmax value is stored in Array Flags.)Column Index (jc) miINT32 (N+1)*sizeof(int32)where N is the second element of the Dimensionsarray subelement.Real part (pr)Imaginary part (pi)(Optional)Any numericdata typeAny numericdata typenumber-of-nonzero-values*size-of-Data-Typenumber-of-nonzero-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.1-22