[Dune] [#396] please add "BCRSMatrix += Scalar" operator

[Dune]

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User who did this - Jö Fahlke (joe) 

Attached to Project - Dune
Summary - please add "BCRSMatrix += Scalar" operator
Task Type - Bug Report
Category - ISTL
Status - New
Assigned To - 
Operating System - Unspecified / All
Severity - Low
Priority - Normal
Reported Version - SVN
Due in Version - Undecided
Due Date - Undecided
Details - The operator should add unity times the scalar to the matrix. For example adding the unit matrix to matrix A then becomes "A += 1". I currently use the follwing implementation:

  template<typename B, typename A>
  BCRSMatrix<B, A> &
  operator+=(BCRSMatrix<B, A> &M, typename B::field_type scalar)
  {
    assert(M.N() == M.M());
    for(int i = 0; i < M.N(); ++i)
      M[i][i] += scalar;
    return M;
  }

(This uses operator+=(FieldMatrix, Scalar) from http://www.dune-project.org/flyspray/index.php?do=details&task_id=395 indirectly)

More information can be found at the following URL:
http://www.dune-project.org/flyspray/index.php?do=details&task_id=396

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