Project Summary
Eigen is a C++ template library for linear algebra: matrices, vectors, numerical solvers, and related algorithms.
* It supports tiny & large dense, and sparse matrices, fully integrated with one another.
* It has no dependency and no binary to compile or link-to.
* It takes full advantage of expression templates to provide a great API, and enable many optimizations including temporary removal, and intelligent explicit vectorization (SSE, AVX, AltiVec, and NEON).
* Performance is on par with the best BLAS implementations.
* It provides linear solvers comparable to LAPACK as well as sparse direct and iterative methods with preconditioners.
* It keeps in mind the real needs of applications, for example the geometry features needed for 3D graphics.
In a Nutshell, Eigen...
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has a well established, mature codebase
maintained by a very large development team
with stable Y-O-Y commits -
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took an estimated 153 years of effort (COCOMO model)
starting with its first commit in May, 2007
ending with its most recent commit 2 days ago
GNU Lesser General Public License v3.0 only
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These details are provided for information only. No information here is legal advice and should not be used as such.
Mozilla Public License 2.0
Permitted
Commercial Use
Modify
Distribute
Place Warranty
Sub-License
Use Patent Claims
Forbidden
Hold Liable
Use Trademarks
Required
Distribute Original
Disclose Source
Include Copyright
Include License
These details are provided for information only. No information here is legal advice and should not be used as such.
Project Security
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30 Day SummaryNov 16 2025 — Dec 16 2025
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12 Month SummaryDec 16 2024 — Dec 16 2025
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