Contents

sparse_insert_entries_double(_:_:_:_:_:)

Inserts a list of scalar entries into a double-precision sparse matrix.

Declaration

func sparse_insert_entries_double(_ A: sparse_matrix_double!, _ N: sparse_dimension, _ val: UnsafePointer<Double>!, _ indx: UnsafePointer<sparse_index>!, _ jndx: UnsafePointer<sparse_index>!) -> sparse_status

Parameters

  • A:

    The sparse matrix, A, which must have been created with Sparse_matrix_create_double(_:_:). Sparse_illegal_parameter is returned if not met.

  • N:

    The number of values to insert into A. Each of indx, jndx and val are of size N.

  • val:

    Pointer to list of scalar values to insert into A. The value is inserted into the location specified by the corresponding indices in indx and jndx. Must hold N values.

  • indx:

    An array of row indices that correspond to the values in val. Must hold N values.

  • jndx:

    An array of column indices that correspond to the values in val. Must hold N values.

Discussion

Use to build a sparse matrix by providing a list of point entries. For each entry provided, update A[indx[i],jndx[i]] = val[i].

Note that matrix properties cannot be modified after value insertion begins. This includes properties such as specifying a triangular matrix.

Insertion can be expensive, generally speaking it is best to do a batch update. Inserted values may be temporarily held internally within the object and only inserted into the sparse format when a later computation triggers a need to insert.

Indices in indx and jndx an are assumed to be unique. Additionally, indices are assumed to be in the bounds of the matrix. Undefined behavior if any of these assumptions are not met.All indices are 0 based (the first element of a pointer is ptr[0]).

See Also

Matrix creation and population