10 Preconditioner routines

The base PSBLAS library contains the implementation of two simple preconditioning techniques:

The supporting data type and subroutine interfaces are defined in the module psb_prec_mod. The old interfaces psb_precinit and psb_precbld are still supported for backward compatibility

 10.1 init — Initialize a preconditioner
 10.2 build — Builds a preconditioner
 10.3 apply — Preconditioner application routine
 10.4 descr — Prints a description of current preconditioner
 10.5 clone — clone current preconditioner
 10.6 free — Free a preconditioner