[Dune] [#420] ScaledIdentityMatrix does not implement complete matrix interface.

[Dune]

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The following task has a new comment added:

FS#420 - ScaledIdentityMatrix does not implement complete matrix interface.
User who did this - Carsten Gräser (Carsten)

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In my opinion it is problematic to provide this interface for the following reasons:
1)You should not be able to assign values to A[i][j].
2)ScaledIdentityMatrix is designed to be memory efficient just like std:vector<bool>. The only way to provide at least part of the interface would be proxy classes. Currently operator[] uses FieldVector as quick'n dirty proxy class.

Perhaps a more efficient proxy class should be there but it will never
provide the same interface since you can not store references. Furthermore such an implementation will nor be very fast.

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