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!
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!
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! AMG4PSBLAS version 1.0
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! Algebraic Multigrid Package
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! based on PSBLAS (Parallel Sparse BLAS version 3.7)
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!
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! (C) Copyright 2021
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!
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! Salvatore Filippone
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! Pasqua D'Ambra
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! Fabio Durastante
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!
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! Redistribution and use in source and binary forms, with or without
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! modification, are permitted provided that the following conditions
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! are met:
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! 1. Redistributions of source code must retain the above copyright
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! notice, this list of conditions and the following disclaimer.
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! 2. Redistributions in binary form must reproduce the above copyright
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! notice, this list of conditions, and the following disclaimer in the
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! documentation and/or other materials provided with the distribution.
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! 3. The name of the AMG4PSBLAS group or the names of its contributors may
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! not be used to endorse or promote products derived from this
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! software without specific written permission.
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!
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! THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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! ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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! TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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! PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AMG4PSBLAS GROUP OR ITS CONTRIBUTORS
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! BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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! CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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! SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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! INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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! CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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! ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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! POSSIBILITY OF SUCH DAMAGE.
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!
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!
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subroutine amg_s_base_ainv_update_a(sv,x,desc_data,info)
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use amg_s_base_ainv_mod, amg_protect_name => amg_s_base_ainv_update_a
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use psb_base_mod
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implicit none
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type(psb_desc_type), intent(in) :: desc_data
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class(amg_s_base_ainv_solver_type), intent(inout) :: sv
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real(psb_spk_),intent(in) :: x(:)
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integer(psb_ipk_), intent(out) :: info
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! Local variables
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real(psb_spk_), allocatable :: dd(:), ee(:)
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integer(psb_ipk_) :: nrows, ncols, i, j, k, nzr, nzc, ir, ic
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type(psb_s_csc_sparse_mat) :: ac
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type(psb_s_csr_sparse_mat) :: ar
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dd = sv%dv%get_vect()
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if (size(x)<size(dd)) then
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write(0,*) 'Wrong size in update',size(x),size(dd)
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info = -1
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return
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end if
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ee = x(1:size(dd))
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call sv%z%cp_to(ac)
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call sv%w%cp_to(ar)
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! Compute diag(W ee Z)
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! First ee Z
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call ac%scal(ee,info,side='L')
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! Then diag(W (ee Z))
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do i=1,ar%get_nrows()
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ir = ar%irp(i); nzr = ar%irp(i+1)-ar%irp(i)
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ic = ac%icp(i); nzc = ac%icp(i+1)-ac%icp(i)
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ee(i) = psb_spdot_srtd(&
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& nzr,ar%ja(ir:ir+nzr-1),ar%val(ir:ir+nzr-1),&
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& nzc,ac%ia(ic:ic+nzc-1),ac%val(ic:ic+nzc-1))
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end do
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! Now invert diagonal
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dd = done/dd
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dd = dd + ee
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dd = done/dd
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sv%d = dd
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call sv%dv%bld(dd,mold=sv%dv%v)
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end subroutine amg_s_base_ainv_update_a
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