Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / general-1.3.1 / private / chunk_parcellfun.m

diff --git a/octave_packages/general-1.3.1/private/chunk_parcellfun.m b/octave_packages/general-1.3.1/private/chunk_parcellfun.m
new file mode 100644 (file)
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+++ b/octave_packages/general-1.3.1/private/chunk_parcellfun.m
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+## Copyright (C) 2010 VZLU Prague, a.s., Czech Republic
+## Copyright (C) 2010 Jean-Benoist Leger <jben@jben.info>
+##
+## This program is free software; you can redistribute it and/or modify it under
+## the terms of the GNU General Public License as published by the Free Software
+## Foundation; either version 3 of the License, or (at your option) any later
+## version.
+##
+## This program is distributed in the hope that it will be useful, but WITHOUT
+## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+## details.
+##
+## You should have received a copy of the GNU General Public License along with
+## this program; if not, see <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn{Function File} {} chunk_parcellfun (@dots{:})
+## Undocumented internal function.
+## @end deftypefn
+
+function varargout = chunk_parcellfun (nproc, chunks_per_proc, func,
+  error_handler, verbose_level, varargin)
+
+  args = varargin;
+  
+  nchunks = chunks_per_proc * nproc;
+
+  ## Compute optimal chunk sizes.
+  N = numel (args{1});
+  len_chunk = ceil (N/nchunks);
+  chunk_sizes = len_chunk (ones(1, nchunks));
+  chunk_sizes(1:nchunks*len_chunk - N) -= 1;
+
+  ## Split argument arrays into chunks (thus making arrays of arrays).
+  chunked_args = cellfun (@(arg) mat2cell (arg(:), chunk_sizes), args, ...
+  "UniformOutput", false);
+
+  ## Attach error handler if present.
+  if (! isempty (error_handler))
+    chunked_args = [chunked_args, {"ErrorHandler", error_handler}];
+  endif
+
+  ## Main call.
+  [out_brut{1:nargout}] = parcellfun (nproc, func, chunked_args{:}, ...
+  "UniformOutput", false, "VerboseLevel", verbose_level);
+
+  ## Concatenate output args and reshape them to correct size.
+  true_size = size (args{1});
+  varargout = cellfun (@(arg) reshape (vertcat (arg{:}), true_size), out_brut, "UniformOutput", false);
+
+endfunction
+