                     SUNLINSOL_PCG
                 released as part of SUNDIALS
    SUite of Nonlinear and DIfferential/ALgebraic equation Solvers
                   Release 3.0.0, September 2017


Preconditioned conjugate gradient implementation of the SUNLINSOL 
module for SUNDIALS.  

SUNLINSOL_PCG defines the content field of SUNMatrix to be a structure 
containing X, along with a long integer for any error flag that arises
in the linear solver routines.

SUNLINSOL_PCG defines a constructor for the PCG SUNLinearSolver and a 
routine to enable/disable preconditioning, in addition to
implementation of all linear solver operations defined by the generic
SUNLINSOL module in the table of operations.


A. Documentation
----------------

The PCG SUNLINSOL implementation is fully described in the user
documentation for any of the SUNDIALS solvers. A PDF file for the user
guide for a particular solver is available in the solver's
subdirectory under doc/. 


B. Installation
---------------

For basic installation instructions see /sundials/INSTALL_GUIDE.pdf. 
For complete installation instructions see any of the user guides.


D. Releases
-----------
v. 1.0   - date?


