MATLAB Excel Builder

Class MWSparse

The MWSparse class passes or receives a two-dimensional sparse numeric array into or from a compiled class method. This class has seven properties/methods:

• Property NumRows As Long
• Property NumColumns As Long
• Property RowIndex As Variant
• Property ColumnIndex As Variant
• Property Array As Variant
• Property MWFlags As MWFlags
• Sub Clone(ppSparse As MWSparse)

Property NumRows As Long

Stores the row dimension for the array. The value of NumRows must be nonnegative. If the value is zero, the row index is taken from the maximum of the values in the RowIndex array.

Property NumColumns As Long

Stores the column dimension for the array. The value of NumColumns must be nonnegative. If the value is zero, the row index is taken from the maximum of the values in the ColumnIndex array.

Property RowIndex As Variant

Stores the array of row indices of the nonzero elements of the array. The value of this property can be any type coercible to a Variant, as well as object types, with the restriction that the underlying array must resolve to or be coercible to a numeric matrix of type Long. If the value of NumRows is nonzero and any row index is greater than NumRows, a bad-index error occurs. An error also results if the number of elements in the RowIndex array does not match the number of elements in the Array property's underlying array.

Property ColumnIndex As Variant

Stores the array of column indices of the nonzero elements of the array. The value of this property can be any type coercible to a Variant, as well as object types, with the restriction that the underlying array must resolve to or be coercible to a numeric matrix of type Long. If the value of NumColumns is nonzero and any column index is greater than NumColumns, a bad-index error occurs. An error also results if the number of elements in the ColumnIndex array does not match the number of elements in the Array property's underlying array.

Property Array As Variant

Stores the nonzero array values of the sparse array. The value of this property can be any type coercible to a Variant, as well as object types, with the restriction that the underlying array must resolve to or be coercible to a numeric matrix of type Double or Boolean.

Property MWFlags As MWFlags

Stores a reference to an MWFlags object. This property sets or gets the array formatting and data conversion flags for a particular sparse array. Each MWSparse object has its own MWFlags property. This property overrides the value of the any flags set on the object whose method's are called.

Sub Clone(ppSparse As MWSparse)

Creates a copy of an MWSparse object.

Parameters.   

Argument	Type	Description
ppSparse	MWSparse	Reference to an uninitialized MWSparse object to receive the copy.

Return Value.   None.

Remarks.   Clone allocates a new MWSparse object and creates a deep copy of the object's contents. Call this function when a separate object is required instead of a shared copy of an existing object reference.

Example.   The following Visual Basic sample creates a 5-by-5 tridiagonal sparse array with the following entries:

• X = [ 2 -1  0   0   0
       -1  2 -1   0   0
        0 -1  2  -1   0
        0  0 -1   2  -1
        0  0  0  -1   2 ]
  
  Sub foo()
      Dim x As MWSparse
      Dim rows(1 To 13) As Long
      Dim cols(1 To 13) As Long
      Dim vals(1 To 13) As Double
      Dim I As Long, K As Long
  
      On Error GoTo Handle_Error
      K = 1
      For I = 1 To 4
          rows(K) = I
          cols(K) = I + 1
          vals(K) = -1
          K = K + 1
          rows(K) = I
          cols(K) = I
          vals(K) = 2
          K = K + 1
          rows(K) = I + 1
          cols(K) = I
          vals(K) = -1
          K = K + 1
      Next
      rows(K) = 5
      cols(K) = 5
      vals(K) = 2
      Set x = New MWSparse
      x.NumRows = 5
      x.NumColumns = 5
      x.RowIndex = rows
      x.ColumnIndex = cols
      x.Array = vals
          .
          .
          .
      Exit Sub
  Handle_Error:
      MsgBox (Err.Description)
  End Sub
  

Class MWComplex

Class MWArg