Hi all,
  I am learning step-7 which has the same class AffineConstraints class, in
step6, we use the member function ::distribute_local_to_global to put the
local matrix and rhs into global matrix and rhs, but in step-7, we still
use system_matrix.add and then use the constraint.condense on system_matrix
and system_rhs. Do those two procedure have the same effect?

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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