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### 10 Preconditioner routines

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

- Diagonal Scaling
- Block Jacobi with ILU(0) factorization

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

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