xtensor provides the following classification functions for xexpressions and scalars:
Defined in xtensor/xmath.hpp
.. doxygenfunction:: isfinite(E&&) :project: xtensor
.. doxygenfunction:: isinf(E&&) :project: xtensor
.. doxygenfunction:: isnan(E&&) :project: xtensor
.. doxygenfunction:: isclose(E1&&, E2&&, double, double, bool) :project: xtensor
.. doxygenfunction:: allclose(E1&&, E2&, double, double) :project: xtensor