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C++ API

[...] = SBProd (...)
  multiplies a symmetric banded matrix with a matrix

  X=SBProd(A,B)

   A is mxt where t-1 is number of non-zero superdiagonals
   B is mxn
   X is mxn

  if A would be ! 11000 ! then A= ! 11 !
                ! 14300 !         ! 43 !
                ! 03520 !         ! 52 !
                ! 00285 !         ! 85 !
                ! 00059 !         ! 90 !

  B is full matrix Ax=B