Subroutine mld

Subroutine mld_precinit

mld_precinit(p,ptype,info)
mld_precinit(p,ptype,info,nlev)

This routine allocates and initializes the preconditioner data structure, according to the preconditioner type chosen by the user.

Arguments

p type(mld_xprec_type), intent(inout).

The preconditioner data structure. Note that x must be chosen according to the real/complex, single/double precision version of MLD2P4 under use.

ptype character(len=*), intent(in).

The type of preconditioner. Its values are specified in Table 1.

Note that the strings are case insensitive.

info integer, intent(out).

Error code. If no error, 0 is returned. See Section 7 for details.

nlev integer, optional, intent(in).

The number of levels of the multilevel preconditioner. If nlev is not present and ptype='ML', 'ml', then nlev=2 is assumed. Otherwise, nlev is ignored.

`p`	`type(mld_`x`prec_type), intent(inout)`.
	The preconditioner data structure. Note that x must be chosen according to the real/complex, single/double precision version of MLD2P4 under use.
`ptype`	`character(len=*), intent(in)`.
	The type of preconditioner. Its values are specified in Table 1.
	Note that the strings are case insensitive.
`info`	`integer, intent(out)`.
	Error code. If no error, 0 is returned. See Section 7 for details.
`nlev`	`integer, optional, intent(in)`.
	The number of levels of the multilevel preconditioner. If `nlev` is not present and `ptype`=`'ML'`, `'ml'`, then `nlev`=2 is assumed. Otherwise, `nlev` is ignored.