/usr/share/octave/site/m/sundialsTB/cvodes/function_types/CVPrecSolveFnB.m is in octave-sundials 2.5.0-3+b1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | %CVPrecSolveFnB - type for user provided preconditioner solve function for backward problems.
%
% The user-supplied preconditioner solve function PSOLFN
% is to solve a linear system P z = r in which the matrix P is
% one of the preconditioner matrices P1 or P2, depending on the
% type of preconditioning chosen.
%
% The function PSOLFUNB must be defined either as
% FUNCTION [ZB, FLAG] = PSOLFUNB(T,Y,YB,FYB,RB)
% or as
% FUNCTION [ZB, FLAG, NEW_DATA] = PSOLFUNB(T,Y,YB,FYB,RB,DATA)
% depending on whether a user data structure DATA was specified in
% CVodeInit. In either case, it must return the vector ZB and the
% flag FLAG.
%
% See also CVPrecSetupFnB, CVodeSetOptions
%
% NOTE: PSOLFUNB is specified through the property PrecSolveFn to
% CVodeSetOptions and is used only if the property LinearSolver was
% set to 'GMRES', 'BiCGStab', or 'TFQMR' and if the property PrecType
% is not 'None'.
% Radu Serban <radu@llnl.gov>
% Copyright (c) 2005, The Regents of the University of California.
% $Revision: 1.2 $Date: 2011/06/01 20:44:05 $
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