spectra ☆

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Description:
Header-only C++ library for large scale eigenvalue problems

Type: Formula | Latest Version: 1.2.0@0 | Tracked Since: Nov 2, 2025

Links: Homepage | formulae.brew.sh

Category: Developer tools

Tags: c++ eigenvalue linear-algebra scientific-computing header-only

Install: brew install spectra

About:
Spectra is a header-only C++ library for solving large scale eigenvalue problems. It provides efficient iterative algorithms like Arnoldi and Lanczos methods, built on top of the Eigen library. This enables high-performance computation of a subset of eigenvalues and eigenvectors for sparse matrices.

Key Features:

Header-only library (no compilation required)
Efficient iterative algorithms (Arnoldi, Lanczos)
Seamless integration with Eigen library
Computes partial eigenvalue spectra
Supports both symmetric and non-symmetric matrices

Use Cases:

Scientific computing and numerical analysis
Principal component analysis (PCA) in machine learning
Physics simulations involving quantum mechanics or structural analysis
Dimensionality reduction algorithms

Alternatives:

ARPACK – ARPACK is the underlying Fortran library Spectra can use, but Spectra provides a modern C++ interface and is header-only.
Eigen – Eigen provides dense matrix operations and basic solvers, while Spectra specializes in large-scale sparse eigenvalue problems.

Version History

Detected	Version	Rev	Change	Commit
Nov 2, 2025 6:42am		0	VERSION_BUMP	83a8eb47
Aug 3, 2024 4:27am		0	VERSION_BUMP	83ff1c5e