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A no-op wrapper to assert the input argument is positive semidefinite.
PSDWrap(arg)# S4 method for PSDWrap is_psd(object)
# S4 method for PSDWrap is_psd(object)
A '>Expression object or matrix.
A '>PSDWrap object.
is_psd: Is the atom positive semidefinite?
is_psd