Dear all,
  I am adding an absorbing boundary condition like step-24 did in the
frequency domain, in which the time derivative gives a complex term.  I
also found the complex acoustic wave problem step-29 which splits the
complex wave function into two real parts.
  What I want to know is what if I directly set up the matrix and rhs
vector as complex<double> ? Why does step-29 says "*it is often more
convenient to split complex valued functions into their real and imaginary
parts and use separate scalar finite element fields for discretizing each
one of them*" ?
Best wishes,

Yuesu Jin,
Ph.D student,
University of Houston,
College of Natural Sciences and Mathematics,
Department of Earth and Atmospheric Sciences,
Houston, Texas 77204-5008

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