Octave BiCGStab algorithm involves a 0 division in case of a preconditioner equal to the LU decomposition of the A matrix (in a linear system of the form A.x = b).
- The solution:
Checks if the linear system is solved simply using: x_new = x_old + U \ (L \ x_old)
Ticket #11
* fix options stack_solve_algo={2,3,4} (closes#68)
* fix crashes for singular normalizations (closes#44) and implement decreasing cutoff
* fail for stack_solve_algo=2 under Octave (because there is no gmres function in Octave)
git-svn-id: https://www.dynare.org/svn/dynare/trunk@3279 ac1d8469-bf42-47a9-8791-bf33cf982152
* Added solve_algo=5 for steady
* Remove obsolete method option of simul
* Added various checks to avoid unimplemented combinations of bytecode/block/solve_algo/stack_solve_algo
git-svn-id: https://www.dynare.org/svn/dynare/trunk@2882 ac1d8469-bf42-47a9-8791-bf33cf982152
- mfs: new option for 'steady' and 'model' commands. Determines the equation belonging to the set of feedback variables.
mfs = 0 => all variables are considered as feedback variables (default value)
mfs = 1 => using only naturally normalized equation as potential recursive equations (all variables assigned to unnormalized equations are considered as feedback variable)
mfs = 2 => adding to the set of potential recursive equation with mfs = 1 the linear equation in endogenous variable normalized (all variables assigned to nonlinear unnormalized equations are considered as feedback variable)
mfs = 3 => adding to the set of potential recursive equation with mfs = 2 the non linear equation in endogenous variable normalized
- correction of few buggs in simulate.dll
- block_mfs_dll: new option for 'steady' command. Use simulate.dll to solve the steady state model (speedup the computation of the steady-state and the homotopy)
git-svn-id: https://www.dynare.org/svn/dynare/trunk@2866 ac1d8469-bf42-47a9-8791-bf33cf982152
- normalize an equation linear in its endogenous variable
- Chained rule derivatives (necessary to reduce a block to the feedback equations and variables)
git-svn-id: https://www.dynare.org/svn/dynare/trunk@2726 ac1d8469-bf42-47a9-8791-bf33cf982152