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The subroutines are classified as follows:
- driver routines, each of which
solves a complete problem,
for example solving a system of linear equations, or computing the
eigenvalues of a real symmetric matrix. Users are recommended to use
a driver routine if there is one that meets their requirements. The
are listed in Section 2.2 and documented in Part II.
- computational routines,
each of which performs a distinct
computational task, for example an LU factorization, or the reduction of
a real symmetric matrix to tridiagonal form. Each driver routine calls a
sequence of computational routines. Users (especially software
developers) may need to call computational routines directly to
perform tasks, or sequences of tasks, that cannot conveniently be
performed by the driver routines. The computational routines are
documented in Part III.
- auxiliary routines, which are
primarily for internal use. These are not documented in this book.