[Dune] [#395] please add "FieldMatrix += Scalar" operator

[Dune]

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User who did this - Jö Fahlke (joe) 

Attached to Project - Dune
Summary - please add "FieldMatrix += Scalar" operator
Task Type - Feature Request
Category - Common
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 K, int n>
  FieldMatrix<K, n, n> &
  operator+=(FieldMatrix<K, n, n> &M, K scalar)
  {
    for(int i = 0; i < n; ++i)
      M[i][i] += scalar;
    return M;
  }


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http://www.dune-project.org/flyspray/index.php?do=details&task_id=395

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