[Octave-patch-tracker] [patch #8974] GSOC16 - Improve iterative methods for sparse linear systems

[Cristiano Dorigo]

URL:
  <http://savannah.gnu.org/patch/?8974>

                 Summary: GSOC16 - Improve iterative methods for sparse linear
systems
                 Project: GNU Octave
            Submitted by: cristianodorigo
            Submitted on: Sat 09 Apr 2016 05:31:11 PM GMT
                Category: None
                Priority: 5 - Normal
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any

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Details:

Dear all,
I submitted a proposal for the GSOC16 project mentioned in the summary.
In the attached patch there is an idea of how to work for the first part of
the project. 

I wrote the private function __default__input__.m that performs as follows:
[varargout] = __default__input.m__(def_val, varargin) and verifies the values
of the varargin variables, if they are filled then varargout{i} = varargin{i},
otherwise if they miss or are empty thevarargout{i} = def_val{i}, where
def_val is a cell array that contains the defaul desired values.

Then I substituted the internal input control of restart,rtol,maxit in the
gmres code using the previous function and the same for tol,maxit,x0 in pcg.

I made the function __default__input__ more general as possible because the
variables that need a control in gmres and pcg are different (in this specific
case gmres has the restart values that pcg hasn't).

The next step could be at first to improve and/or fix this function if there
are some useless things and/or missing features , then to extend this input
check for the other algorithms mentioned in the GSOC project (pcr, bicg,
bicgstab, cgs, and qmr). Then I think that can be useful another private
function that check if are consistent the matrix A, the preconditioners M1, M2
and the right-hand-side vector b.

Please don't hesistate to give me some advices, observations or tell me if I'm
working in an uncorrected road.








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File Attachments:


-------------------------------------------------------
Date: Sat 09 Apr 2016 05:31:11 PM GMT  Name: input_control_sparse.cset  Size:
7kB   By: cristianodorigo

<http://savannah.gnu.org/patch/download.php?file_id=36878>

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