# Memory Management Retain and release sparse objects. ## Topics ### Resource Retention [`func SparseRetain(SparseOpaqueSymbolicFactorization) -> SparseOpaqueSymbolicFactorization`](/documentation/Accelerate/SparseRetain(_:)-8r2dm) Increases the reference count on a symbolic factorization object. [`func SparseRetain(SparseOpaqueFactorization_Double) -> SparseOpaqueFactorization_Double`](/documentation/Accelerate/SparseRetain(_:)-8943y) Increases the reference count on a double-precision numeric factorization object. [`func SparseRetain(SparseOpaqueFactorization_Float) -> SparseOpaqueFactorization_Float`](/documentation/Accelerate/SparseRetain(_:)-7onhr) Increases the reference count on a single-precision numeric factorization object. [`func SparseRetain(SparseOpaqueSubfactor_Double) -> SparseOpaqueSubfactor_Double`](/documentation/Accelerate/SparseRetain(_:)-2pmdl) Increases the reference count on a double-precision subfactor object. [`func SparseRetain(SparseOpaqueSubfactor_Float) -> SparseOpaqueSubfactor_Float`](/documentation/Accelerate/SparseRetain(_:)-6mr6d) Increases the reference count on a single-precision subfactor object. [`func SparseRetain(SparseOpaqueFactorization_Complex_Double) -> SparseOpaqueFactorization_Complex_Double`](/documentation/Accelerate/SparseRetain(_:)-5sahb) Increase reference count on a numeric factorization object, returning a copy. [`func SparseRetain(SparseOpaqueSubfactor_Complex_Float) -> SparseOpaqueSubfactor_Complex_Float`](/documentation/Accelerate/SparseRetain(_:)-6pp40) Increase reference count on a numeric factorization object, returning a copy. [`func SparseRetain(SparseOpaqueSubfactor_Complex_Double) -> SparseOpaqueSubfactor_Complex_Double`](/documentation/Accelerate/SparseRetain(_:)-92857) Increase reference count on a numeric factorization object, returning a copy. [`func SparseRetain(SparseOpaqueFactorization_Complex_Float) -> SparseOpaqueFactorization_Complex_Float`](/documentation/Accelerate/SparseRetain(_:)-92v4w) Increase reference count on a numeric factorization object, returning a copy. ### Resource Cleanup [`func SparseCleanup(SparseMatrix_Double)`](/documentation/Accelerate/SparseCleanup(_:)-6ywzn) Releases a matrix of double-precision values’ references to any memory that the Sparse Solvers library allocates. [`func SparseCleanup(SparseMatrix_Float)`](/documentation/Accelerate/SparseCleanup(_:)-9f4vi) Releases a matrix of single-precision values’ references to any memory that the Sparse Solvers library allocates. [`func SparseCleanup(SparseOpaqueFactorization_Double)`](/documentation/Accelerate/SparseCleanup(_:)-3cnxt) Releases a factorization of a matrix of double-precision values’ references to any memory that the Sparse Solvers library allocates. [`func SparseCleanup(SparseOpaqueFactorization_Float)`](/documentation/Accelerate/SparseCleanup(_:)-4kus5) Releases a factorization of a matrix of single-precision values’ references to any memory that the Sparse Solvers library allocates. [`func SparseCleanup(SparseOpaqueSymbolicFactorization)`](/documentation/Accelerate/SparseCleanup(_:)-6jpd8) Releases a matrix factorization’s references to any memory that the Sparse Solvers library allocates. [`func SparseCleanup(SparseOpaqueSubfactor_Double)`](/documentation/Accelerate/SparseCleanup(_:)-15kpj) Releases a double-precision subfactor object’s references to any memory that the Sparse Solvers library allocates. [`func SparseCleanup(SparseOpaqueSubfactor_Float)`](/documentation/Accelerate/SparseCleanup(_:)-1mrmc) Releases a single-precision subfactor object’s references to any memory that the Sparse Solvers library allocates. [`func SparseCleanup(SparseOpaquePreconditioner_Double)`](/documentation/Accelerate/SparseCleanup(_:)-45lq7) Releases a double-precision preconditioner’s references to any memory that the Sparse Solvers library allocates. [`func SparseCleanup(SparseOpaquePreconditioner_Float)`](/documentation/Accelerate/SparseCleanup(_:)-1qhk8) Releases a single-precision preconditioner’s references to any memory that the Sparse Solvers library allocates. [`func SparseCleanup(SparseOpaquePreconditioner_Complex_Float)`](/documentation/Accelerate/SparseCleanup(_:)-1jxdh) Release a Sparse Preconditioner’s references to any memory allocated by the sparse library. [`func SparseCleanup(SparseOpaqueFactorization_Complex_Double)`](/documentation/Accelerate/SparseCleanup(_:)-28nz7) Release a Sparse Object’s references to any memory allocated by the sparse library. [`func SparseCleanup(SparseMatrix_Complex_Double)`](/documentation/Accelerate/SparseCleanup(_:)-3wccz) Release a Sparse matrix’s references to any memory allocated by the Sparse library. [`func SparseCleanup(SparseMatrix_Complex_Double)`](/documentation/Accelerate/SparseCleanup(_:)-3wccz) Release a Sparse matrix’s references to any memory allocated by the Sparse library. [`func SparseCleanup(SparseOpaqueSubfactor_Complex_Float)`](/documentation/Accelerate/SparseCleanup(_:)-4enlt) Release a Sparse Object’s references to any memory allocated by the sparse library. [`func SparseCleanup(SparseMatrix_Complex_Float)`](/documentation/Accelerate/SparseCleanup(_:)-4z3l9) Release a Sparse matrix’s references to any memory allocated by the Sparse library. [`func SparseCleanup(SparseOpaquePreconditioner_Complex_Double)`](/documentation/Accelerate/SparseCleanup(_:)-5ajx) Release a Sparse Preconditioner’s references to any memory allocated by the sparse library. [`func SparseCleanup(SparseOpaqueFactorization_Complex_Float)`](/documentation/Accelerate/SparseCleanup(_:)-61q1a) Release a Sparse Object’s references to any memory allocated by the sparse library. [`func SparseCleanup(SparseOpaqueSubfactor_Complex_Double)`](/documentation/Accelerate/SparseCleanup(_:)-7nhza) Release a Sparse Object’s references to any memory allocated by the sparse library. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)