On Fri, Jul 9, 2021 at 4:20 AM 张瑞 <[email protected]> wrote: > thanks for your reply, I tried to add the code #define EIGEN_USE_BLAS, > but it still doesn't work. >
As mentioned at https://eigen.tuxfamily.org/dox/TopicUsingBlasLapack.html, EIGEN_USE_BLAS enables the use of *external* BLAS, which means it needs additional libraries. To use Eigen's internal math backend, you need to NOT define any of the macros listed at that URL. Best regards, -Edward
