线性算术的C++模板库，Eigen 3.1 发布

   <p><a href="/misc/goto?guid=4958187572302047637" target="_blank">Eigen </a>3.1 的改进记录：</p>    <ol>     <li>A new set of officially supported sparse modules for the representation, assembly, and solving of sparse problems, including many built-in and third-party sparse linear<span class="truncate_more"> solvers. <br /> </span></li>     <li><span class="truncate_more">The ability to seamlessly fallback to Intel MKL for some operations such as including matrix products, dense matrix decompositions, and math array operations. <br /> </span></li>     <li><span class="truncate_more">These optional backends can be enabled at compile-time. <br /> </span></li>     <li><span class="truncate_more">Some new coefficient and vector-wise operations, rank update/downdate for LLT and LDLT factorizations, closed form eigen-decompositions, and some memory and performance optimizations<br /> </span></li>    </ol>    <a href="/misc/goto?guid=4958187572302047637" target="_blank">Eigen </a>是一个线性算术的C++模板库，包括：vectors, matrices, 以及相关算法。功能强大、快速、优雅以及支持多平台。