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#### 5.5 Method build

call p%build(a,desc_a,info[,amold,vmold,imold])

This method builds the preconditioner p according to the requirements made by the user through the methods init and set (see Sections 5.3 and 5.4 for multilevel preconditioners). It is mostly provided for backward compatibility; indeed, it is internally implemented by invoking the two previous methods hierarchy_build and smoothers_build, whose nomenclature would however be somewhat unnatural when dealing with simple one-level preconditioners.

Arguments

a | type(psb_x spmat_type), intent(in).
| The sparse matrix structure containing the local part of the matrix to be preconditioned. Note that x must be chosen according to the real/complex, single/double precision version of AMG4PSBLAS under use. See the PSBLAS User’s Guide for details [20].
desc_a | type(psb_desc_type), intent(in).
| The communication descriptor of a. See the PSBLAS User’s Guide for details [20].
info | integer, intent(out).
| Error code. If no error, 0 is returned. See Section 7 for details.
amold | class(psb_x_base_sparse_mat), intent(in), optional.
| The desired dynamic type for internal matrix components; this allows e.g. running on GPUs; it needs not be the same on all processes. See the PSBLAS User’s Guide for details [20].
vmold | class(psb_x_base_vect_type), intent(in), optional.
| The desired dynamic type for internal vector components; this allows e.g. running on GPUs.
imold | class(psb_i_base_vect_type), intent(in), optional.
| The desired dynamic type for internal integer vector components; this allows e.g. running on GPUs.

The method can be used to build multilevel preconditioners too.

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