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C++ API

[...] = SBBacksub (...)
  using backsubstitution  to return the solution of a system of linear equations

  X=SBBacksub(R,B)

   B is mxn
   X is mxn
   R is mxt

   R is produced by a call of [X,R] = SBSolve(A,B) or R = SBFactor(A)
   It is an upper right band matrix
   The first column of R contains the entries of a diagonal matrix D.
   If the first column of R is filled by 1's, then we have R'*D*R = A