Here are the classes, structs, unions and interfaces with brief descriptions:

[detail level 12]

▼Nirlba	Implements IRLBA for approximate SVD
CAdjointWorkspace	Workspace class for multiplying a transposed `Matrix`
CCenteredAdjointWorkspace	Workspace class for multiplying a transposed `CenteredMatrix`
CCenteredMatrix	Deferred centering of a matrix
CCenteredRealizeWorkspace	Workspace class for realizing a `CenteredMatrix`
CCenteredWorkspace	Workspace class for multiplying a `CenteredMatrix`
CEigenThreadScope	Restrict the number of available threads for Eigen
CMatrix	Interface for a matrix to use in `compute()`
COptions	Options for running IRLBA in `compute()` and `pca()`
CParallelSparseAdjointWorkspace	Workspace for multiplication of a transposed `ParallelSparseMatrix`
CParallelSparseMatrix	Sparse matrix with customizable parallelization
CParallelSparseRealizeWorkspace	Workspace for realizing a `ParallelSparseMatrix`
CParallelSparseWorkspace	Workspace for multiplication of a `ParallelSparseMatrix`
CPcaResults	Results of the IRLBA-based PCA by `pca()`
CRealizeWorkspace	Workspace class for realizing a `Matrix`
CResults	Results of the IRLBA-based SVD by `compute()`
CScaledAdjointWorkspace	Workspace class for multiplying a transposed `ScaledMatrix`
CScaledMatrix	Deferred scaling of a matrix
CScaledRealizeWorkspace	Workspace class for realizing a `ScaledMatrix`
CScaledWorkspace	Workspace class for multiplying a `ScaledMatrix`
CSimpleAdjointWorkspace	Workspace class for multiplying a transposed `SimpleMatrix`
CSimpleMatrix	A `Matrix`-compatible wrapper around a "simple" matrix
CSimpleRealizeWorkspace	Workspace class for realizing a `SimpleMatrix`
CSimpleWorkspace	Workspace class for multiplying a `SimpleMatrix`
CWorkspace	Workspace class for multiplying a `Matrix`