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In VS 2017, `std::arg` for real inputs always returns 0, even for negative inputs. It should return `PI` for negative real values. This seems to be fixed in VS 2019 (MSVC 1920). (cherry picked from commit 2b410ecbefea1bf4b9d50decb946a4ebe4a73f98)
Eigen is a C++ template library for linear algebra: matrices, vectors, numerical solvers, and related algorithms.
For more information go to http://eigen.tuxfamily.org/.
For pull request, bug reports, and feature requests, go to https://gitlab.com/libeigen/eigen.
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