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125 lines
4.0 KiB
Fortran
125 lines
4.0 KiB
Fortran
!
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! Parallel Sparse BLAS version 3.5
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! (C) Copyright 2006-2018
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! Salvatore Filippone
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! Alfredo Buttari
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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 PSBLAS 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 PSBLAS 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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! File: psb_cnrmi.f90
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!
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! Function: psb_cnrmi
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! Computes the infinity norm of a sparse matrix,
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!
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! nrmi := max_i(sum(abs(A(i,:))))
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!
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! Arguments:
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! a - type(psb_cspmat_type). The sparse matrix containing A.
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! desc_a - type(psb_desc_type). The communication descriptor.
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! info - integer. Return code
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! global - logical(optional) Whether to perform the global reduction, default: .true.
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!
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function psb_cnrmi(a,desc_a,info,global) result(res)
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use psb_base_mod, psb_protect_name => psb_cnrmi
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implicit none
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type(psb_cspmat_type), intent(in) :: a
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integer(psb_ipk_), intent(out) :: info
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type(psb_desc_type), intent(in) :: desc_a
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real(psb_spk_) :: res
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logical, intent(in), optional :: global
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! locals
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integer(psb_ipk_) :: ictxt, np, me,&
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& err_act, iia, jja, mdim, ndim
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integer(psb_lpk_) :: m, n, ia, ja
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logical :: global_
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character(len=20) :: name, ch_err
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name='psb_cnrmi'
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info=psb_success_
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call psb_erractionsave(err_act)
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if (psb_errstatus_fatal()) then
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info = psb_err_internal_error_ ; goto 9999
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end if
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ictxt=desc_a%get_context()
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call psb_info(ictxt, me, np)
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if (np == -1) then
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info = psb_err_context_error_
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call psb_errpush(info,name)
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goto 9999
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endif
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if (present(global)) then
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global_ = global
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else
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global_ = .true.
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end if
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ia = 1
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ja = 1
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m = desc_a%get_global_rows()
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n = desc_a%get_global_cols()
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call psb_chkmat(m,n,ia,ja,desc_a,info,iia,jja)
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if(info /= psb_success_) then
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info=psb_err_from_subroutine_
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ch_err='psb_chkmat'
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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end if
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if ((iia /= 1).or.(jja /= 1)) then
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info=psb_err_ix_n1_iy_n1_unsupported_
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call psb_errpush(info,name)
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goto 9999
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end if
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if ((m /= 0).and.(n /= 0)) then
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res = a%spnmi()
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if(info /= psb_success_) then
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info=psb_err_from_subroutine_
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ch_err='psb_cnrmi'
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call psb_errpush(info,name,a_err=ch_err)
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goto 9999
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end if
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else
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res = szero
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end if
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! compute global max
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if (global_) call psb_amx(ictxt, res)
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call psb_erractionrestore(err_act)
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return
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9999 call psb_error_handler(ictxt,err_act)
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return
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end function psb_cnrmi
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