Gael Guennebaud 910b387438 Add sub/super-diagonal expression (read/write) as a trivial extension of ...

DiagonalCoeffs. The current API is simply:
  m.diagonal<1>() => 1st super diagonal
  m.diagonal<-2>() => the 2nd sub diagonal
I'll add a code snippet once we agree on this API.

2009-02-05 18:37:21 +00:00

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