Mercurial > octave-nkf
view scripts/general/accumarray.m @ 19627:446c46af4b42 stable
strip trailing whitespace from most source files
* Makefile.am, NEWS, build-aux/common.mk, configure.ac,
doc/Makefile.am, doc/doxyhtml/Makefile.am,
doc/interpreter/Makefile.am, doc/interpreter/arith.txi,
doc/interpreter/audio.txi, doc/interpreter/basics.txi,
doc/interpreter/bugs.txi, doc/interpreter/container.txi,
doc/interpreter/cp-idx.txi, doc/interpreter/data.txi,
doc/interpreter/debug.txi, doc/interpreter/diagperm.txi,
doc/interpreter/diffeq.txi, doc/interpreter/doccheck/README,
doc/interpreter/doccheck/spellcheck, doc/interpreter/emacs.txi,
doc/interpreter/errors.txi, doc/interpreter/eval.txi,
doc/interpreter/expr.txi, doc/interpreter/external.txi,
doc/interpreter/fn-idx.txi, doc/interpreter/func.txi,
doc/interpreter/geometry.txi, doc/interpreter/geometryimages.m,
doc/interpreter/gpl.txi, doc/interpreter/grammar.txi,
doc/interpreter/gui.txi, doc/interpreter/image.txi,
doc/interpreter/install.txi, doc/interpreter/interp.txi,
doc/interpreter/interpimages.m, doc/interpreter/intro.txi,
doc/interpreter/io.txi, doc/interpreter/java.txi,
doc/interpreter/linalg.txi, doc/interpreter/macros.texi,
doc/interpreter/matrix.txi, doc/interpreter/munge-texi.pl,
doc/interpreter/nonlin.txi, doc/interpreter/numbers.txi,
doc/interpreter/obsolete.txi, doc/interpreter/octave-config.1,
doc/interpreter/octave.texi, doc/interpreter/oop.txi,
doc/interpreter/op-idx.txi, doc/interpreter/optim.txi,
doc/interpreter/package.txi, doc/interpreter/plot.txi,
doc/interpreter/poly.txi, doc/interpreter/preface.txi,
doc/interpreter/quad.txi, doc/interpreter/set.txi,
doc/interpreter/signal.txi, doc/interpreter/sparse.txi,
doc/interpreter/sparseimages.m, doc/interpreter/splineimages.m,
doc/interpreter/stats.txi, doc/interpreter/stmt.txi,
doc/interpreter/strings.txi, doc/interpreter/system.txi,
doc/interpreter/testfun.txi, doc/interpreter/tips.txi,
doc/interpreter/var.txi, doc/interpreter/vectorize.txi,
doc/liboctave/Makefile.am, doc/liboctave/array.texi,
doc/liboctave/bugs.texi, doc/liboctave/cp-idx.texi,
doc/liboctave/dae.texi, doc/liboctave/diffeq.texi,
doc/liboctave/error.texi, doc/liboctave/factor.texi,
doc/liboctave/fn-idx.texi, doc/liboctave/gpl.texi,
doc/liboctave/install.texi, doc/liboctave/intro.texi,
doc/liboctave/liboctave.texi, doc/liboctave/matvec.texi,
doc/liboctave/nleqn.texi, doc/liboctave/nlfunc.texi,
doc/liboctave/ode.texi, doc/liboctave/optim.texi,
doc/liboctave/preface.texi, doc/liboctave/quad.texi,
doc/liboctave/range.texi, doc/refcard/Makefile.am,
doc/refcard/refcard.tex, etc/HACKING, etc/NEWS.1, etc/NEWS.2,
etc/NEWS.3, etc/OLD-ChangeLogs/ChangeLog,
etc/OLD-ChangeLogs/doc-ChangeLog,
etc/OLD-ChangeLogs/scripts-ChangeLog,
etc/OLD-ChangeLogs/src-ChangeLog, etc/OLD-ChangeLogs/test-ChangeLog,
etc/PROJECTS, etc/README.Cygwin, etc/README.MacOS, etc/README.MinGW,
etc/README.gnuplot, etc/gdbinit, etc/icons/Makefile.am,
examples/@polynomial/end.m, examples/@polynomial/subsasgn.m,
examples/Makefile.am, examples/standalonebuiltin.cc,
libgui/Makefile.am, libgui/qterminal/libqterminal/README,
libgui/qterminal/libqterminal/unix/BlockArray.cpp,
libgui/qterminal/libqterminal/unix/BlockArray.h,
libgui/qterminal/libqterminal/unix/Character.h,
libgui/qterminal/libqterminal/unix/CharacterColor.h,
libgui/qterminal/libqterminal/unix/Emulation.cpp,
libgui/qterminal/libqterminal/unix/Emulation.h,
libgui/qterminal/libqterminal/unix/Filter.cpp,
libgui/qterminal/libqterminal/unix/Filter.h,
libgui/qterminal/libqterminal/unix/History.cpp,
libgui/qterminal/libqterminal/unix/History.h,
libgui/qterminal/libqterminal/unix/KeyboardTranslator.cpp,
libgui/qterminal/libqterminal/unix/KeyboardTranslator.h,
libgui/qterminal/libqterminal/unix/LineFont.h,
libgui/qterminal/libqterminal/unix/QUnixTerminalImpl.cpp,
libgui/qterminal/libqterminal/unix/QUnixTerminalImpl.h,
libgui/qterminal/libqterminal/unix/Screen.cpp,
libgui/qterminal/libqterminal/unix/Screen.h,
libgui/qterminal/libqterminal/unix/ScreenWindow.cpp,
libgui/qterminal/libqterminal/unix/ScreenWindow.h,
libgui/qterminal/libqterminal/unix/TerminalCharacterDecoder.cpp,
libgui/qterminal/libqterminal/unix/TerminalCharacterDecoder.h,
libgui/qterminal/libqterminal/unix/Vt102Emulation.h,
libgui/qterminal/libqterminal/win32/QWinTerminalImpl.cpp,
libgui/qterminal/qterminal/main.cpp,
libgui/src/m-editor/file-editor-tab.cc, libgui/src/octave-gui.cc,
libgui/src/octave-qt-link.cc, libinterp/corefcn/data.cc,
libinterp/corefcn/defun-int.h, libinterp/corefcn/det.cc,
libinterp/corefcn/gl2ps-renderer.cc, libinterp/corefcn/graphics.cc,
libinterp/corefcn/graphics.in.h, libinterp/corefcn/ls-mat5.cc,
libinterp/corefcn/lu.cc, libinterp/corefcn/oct-tex-parser.yy,
libinterp/corefcn/oct-tex-symbols.in, libinterp/corefcn/quadcc.cc,
libinterp/corefcn/zfstream.cc, libinterp/dldfcn/__eigs__.cc,
libinterp/dldfcn/__voronoi__.cc, libinterp/gendoc.pl,
libinterp/genprops.awk, libinterp/mk-errno-list, libinterp/mk-pkg-add,
libinterp/mkbuiltins, libinterp/mkdefs, libinterp/mkdocs,
libinterp/mkops, libinterp/octave-value/ov-java.cc,
libinterp/parse-tree/lex.ll, libinterp/parse-tree/oct-parse.in.yy,
libinterp/parse-tree/octave.gperf, liboctave/Makefile.am,
liboctave/array/Array.cc, liboctave/array/module.mk,
liboctave/cruft/daspk/datv.f, liboctave/cruft/daspk/dcnst0.f,
liboctave/cruft/daspk/dcnstr.f, liboctave/cruft/daspk/ddasic.f,
liboctave/cruft/daspk/ddasid.f, liboctave/cruft/daspk/ddasik.f,
liboctave/cruft/daspk/ddaspk.f, liboctave/cruft/daspk/ddstp.f,
liboctave/cruft/daspk/ddwnrm.f, liboctave/cruft/daspk/dfnrmd.f,
liboctave/cruft/daspk/dfnrmk.f, liboctave/cruft/daspk/dhels.f,
liboctave/cruft/daspk/dheqr.f, liboctave/cruft/daspk/dinvwt.f,
liboctave/cruft/daspk/dlinsd.f, liboctave/cruft/daspk/dlinsk.f,
liboctave/cruft/daspk/dmatd.f, liboctave/cruft/daspk/dnedd.f,
liboctave/cruft/daspk/dnedk.f, liboctave/cruft/daspk/dnsd.f,
liboctave/cruft/daspk/dnsid.f, liboctave/cruft/daspk/dnsik.f,
liboctave/cruft/daspk/dnsk.f, liboctave/cruft/daspk/dorth.f,
liboctave/cruft/daspk/dslvd.f, liboctave/cruft/daspk/dslvk.f,
liboctave/cruft/daspk/dspigm.f, liboctave/cruft/daspk/dyypnw.f,
liboctave/cruft/dasrt/ddasrt.f, liboctave/cruft/dasrt/drchek.f,
liboctave/cruft/dassl/ddaslv.f, liboctave/cruft/dassl/ddassl.f,
liboctave/cruft/misc/blaswrap.c, liboctave/cruft/misc/module.mk,
liboctave/cruft/odepack/cfode.f, liboctave/cruft/odepack/dlsode.f,
liboctave/cruft/odepack/ewset.f, liboctave/cruft/odepack/intdy.f,
liboctave/cruft/odepack/prepj.f, liboctave/cruft/odepack/sintdy.f,
liboctave/cruft/odepack/slsode.f, liboctave/cruft/odepack/solsy.f,
liboctave/cruft/odepack/ssolsy.f, liboctave/cruft/odepack/stode.f,
liboctave/cruft/odepack/vnorm.f, liboctave/cruft/ranlib/Basegen.doc,
liboctave/cruft/ranlib/README, liboctave/cruft/ranlib/genbet.f,
liboctave/cruft/ranlib/genexp.f, liboctave/cruft/ranlib/gennch.f,
liboctave/cruft/ranlib/gennf.f, liboctave/cruft/ranlib/gennor.f,
liboctave/cruft/ranlib/getsd.f, liboctave/cruft/ranlib/initgn.f,
liboctave/cruft/ranlib/phrtsd.f, liboctave/cruft/ranlib/randlib.fdoc,
liboctave/cruft/ranlib/setsd.f, liboctave/cruft/ranlib/tstgmn.for,
liboctave/cruft/ranlib/tstmid.for, liboctave/cruft/slatec-fn/atanh.f,
liboctave/cruft/slatec-fn/datanh.f,
liboctave/cruft/slatec-fn/xgmainc.f,
liboctave/cruft/slatec-fn/xsgmainc.f, liboctave/numeric/module.mk,
liboctave/operators/mk-ops.awk, liboctave/operators/mx-ops,
liboctave/operators/sparse-mk-ops.awk,
liboctave/operators/sparse-mx-ops, liboctave/operators/vx-ops,
liboctave/util/module.mk, run-octave.in, scripts/@ftp/ftp.m,
scripts/audio/wavread.m, scripts/deprecated/java_convert_matrix.m,
scripts/deprecated/java_debug.m, scripts/deprecated/java_invoke.m,
scripts/deprecated/java_new.m,
scripts/deprecated/java_unsigned_conversion.m,
scripts/deprecated/javafields.m, scripts/deprecated/javamethods.m,
scripts/deprecated/shell_cmd.m, scripts/general/accumarray.m,
scripts/general/display.m, scripts/general/fieldnames.m,
scripts/general/interp1.m, scripts/general/interp2.m,
scripts/general/interp3.m, scripts/general/isa.m,
scripts/general/methods.m, scripts/general/sortrows.m,
scripts/geometry/convhull.m, scripts/geometry/delaunay.m,
scripts/geometry/delaunay3.m, scripts/geometry/delaunayn.m,
scripts/geometry/griddata.m, scripts/geometry/griddatan.m,
scripts/geometry/voronoi.m, scripts/geometry/voronoin.m,
scripts/gui/guihandles.m, scripts/gui/inputdlg.m,
scripts/gui/listdlg.m, scripts/gui/msgbox.m, scripts/gui/questdlg.m,
scripts/gui/uigetfile.m, scripts/gui/waitbar.m, scripts/gui/warndlg.m,
scripts/help/doc.m, scripts/help/help.m, scripts/help/type.m,
scripts/image/bone.m, scripts/image/cmpermute.m,
scripts/image/cmunique.m, scripts/image/colorcube.m,
scripts/image/colormap.m, scripts/image/contrast.m,
scripts/image/gray2ind.m, scripts/image/image.m,
scripts/image/imshow.m, scripts/image/ind2gray.m, scripts/image/jet.m,
scripts/image/rgb2ntsc.m, scripts/image/spinmap.m,
scripts/io/importdata.m, scripts/io/strread.m, scripts/io/textread.m,
scripts/io/textscan.m, scripts/java/java_get.m,
scripts/java/java_set.m, scripts/java/javaaddpath.m,
scripts/java/javaclasspath.m, scripts/java/javamem.m,
scripts/linear-algebra/linsolve.m, scripts/linear-algebra/qzhess.m,
scripts/miscellaneous/debug.m, scripts/miscellaneous/desktop.m,
scripts/miscellaneous/dir.m, scripts/miscellaneous/dos.m,
scripts/miscellaneous/edit.m, scripts/miscellaneous/fact.m,
scripts/miscellaneous/getappdata.m, scripts/miscellaneous/inputname.m,
scripts/miscellaneous/license.m, scripts/miscellaneous/ls_command.m,
scripts/miscellaneous/run.m, scripts/miscellaneous/setfield.m,
scripts/miscellaneous/unix.m, scripts/miscellaneous/ver.m,
scripts/mk-pkg-add, scripts/mkdoc.pl,
scripts/optimization/fminsearch.m, scripts/optimization/optimset.m,
scripts/optimization/sqp.m, scripts/pkg/pkg.m,
scripts/pkg/private/create_pkgadddel.m,
scripts/pkg/private/fix_depends.m, scripts/pkg/private/install.m,
scripts/plot/appearance/axis.m, scripts/plot/appearance/box.m,
scripts/plot/appearance/clabel.m, scripts/plot/appearance/daspect.m,
scripts/plot/appearance/datetick.m, scripts/plot/appearance/grid.m,
scripts/plot/appearance/legend.m, scripts/plot/appearance/orient.m,
scripts/plot/appearance/shading.m, scripts/plot/appearance/text.m,
scripts/plot/appearance/title.m, scripts/plot/appearance/xlabel.m,
scripts/plot/appearance/ylabel.m, scripts/plot/appearance/zlabel.m,
scripts/plot/draw/area.m, scripts/plot/draw/bar.m,
scripts/plot/draw/barh.m, scripts/plot/draw/colorbar.m,
scripts/plot/draw/contour.m, scripts/plot/draw/contour3.m,
scripts/plot/draw/contourf.m, scripts/plot/draw/ellipsoid.m,
scripts/plot/draw/errorbar.m, scripts/plot/draw/ezcontour.m,
scripts/plot/draw/ezcontourf.m, scripts/plot/draw/ezmesh.m,
scripts/plot/draw/ezpolar.m, scripts/plot/draw/fill.m,
scripts/plot/draw/fplot.m, scripts/plot/draw/hist.m,
scripts/plot/draw/meshc.m, scripts/plot/draw/meshz.m,
scripts/plot/draw/pareto.m, scripts/plot/draw/patch.m,
scripts/plot/draw/peaks.m, scripts/plot/draw/pie.m,
scripts/plot/draw/pie3.m, scripts/plot/draw/plot.m,
scripts/plot/draw/plotyy.m, scripts/plot/draw/private/__bar__.m,
scripts/plot/draw/private/__contour__.m,
scripts/plot/draw/private/__errplot__.m,
scripts/plot/draw/private/__ezplot__.m,
scripts/plot/draw/private/__patch__.m,
scripts/plot/draw/private/__stem__.m, scripts/plot/draw/rectangle.m,
scripts/plot/draw/ribbon.m, scripts/plot/draw/rose.m,
scripts/plot/draw/scatter.m, scripts/plot/draw/scatter3.m,
scripts/plot/draw/semilogx.m, scripts/plot/draw/shrinkfaces.m,
scripts/plot/draw/sombrero.m, scripts/plot/draw/sphere.m,
scripts/plot/draw/stairs.m, scripts/plot/draw/stem.m,
scripts/plot/draw/stemleaf.m, scripts/plot/draw/surf.m,
scripts/plot/draw/surface.m, scripts/plot/draw/surfc.m,
scripts/plot/draw/surfl.m, scripts/plot/draw/surfnorm.m,
scripts/plot/draw/tetramesh.m, scripts/plot/draw/trimesh.m,
scripts/plot/draw/triplot.m, scripts/plot/draw/trisurf.m,
scripts/plot/util/__gnuplot_drawnow__.m,
scripts/plot/util/__plt_get_axis_arg__.m, scripts/plot/util/axes.m,
scripts/plot/util/clf.m, scripts/plot/util/copyobj.m,
scripts/plot/util/figure.m, scripts/plot/util/gcbo.m,
scripts/plot/util/graphics_toolkit.m, scripts/plot/util/hggroup.m,
scripts/plot/util/meshgrid.m, scripts/plot/util/newplot.m,
scripts/plot/util/print.m,
scripts/plot/util/private/__add_default_menu__.m,
scripts/plot/util/private/__fltk_print__.m,
scripts/plot/util/private/__gnuplot_print__.m,
scripts/plot/util/private/__print_parse_opts__.m,
scripts/plot/util/refreshdata.m, scripts/plot/util/subplot.m,
scripts/polynomial/conv.m, scripts/polynomial/poly.m,
scripts/polynomial/polyeig.m, scripts/polynomial/polyfit.m,
scripts/polynomial/polyval.m,
scripts/polynomial/private/__splinefit__.m,
scripts/polynomial/spline.m, scripts/prefs/prefdir.m,
scripts/prefs/preferences.m, scripts/prefs/private/prefsfile.m,
scripts/prefs/rmpref.m, scripts/signal/freqz.m,
scripts/signal/module.mk, scripts/sparse/eigs.m, scripts/sparse/pcg.m,
scripts/sparse/private/__sprand_impl__.m, scripts/sparse/sprand.m,
scripts/sparse/sprandn.m, scripts/sparse/spy.m, scripts/sparse/svds.m,
scripts/specfun/expint.m, scripts/specfun/factor.m,
scripts/special-matrix/gallery.m, scripts/special-matrix/hankel.m,
scripts/special-matrix/toeplitz.m, scripts/startup/inputrc,
scripts/statistics/base/kurtosis.m, scripts/statistics/base/moment.m,
scripts/statistics/base/qqplot.m, scripts/statistics/base/var.m,
scripts/statistics/distributions/betarnd.m,
scripts/statistics/distributions/binoinv.m,
scripts/statistics/distributions/binopdf.m,
scripts/statistics/distributions/binornd.m,
scripts/statistics/distributions/cauchy_rnd.m,
scripts/statistics/distributions/chi2rnd.m,
scripts/statistics/distributions/discrete_pdf.m,
scripts/statistics/distributions/discrete_rnd.m,
scripts/statistics/distributions/empirical_rnd.m,
scripts/statistics/distributions/exprnd.m,
scripts/statistics/distributions/frnd.m,
scripts/statistics/distributions/gamrnd.m,
scripts/statistics/distributions/geornd.m,
scripts/statistics/distributions/hygernd.m,
scripts/statistics/distributions/kolmogorov_smirnov_cdf.m,
scripts/statistics/distributions/laplace_cdf.m,
scripts/statistics/distributions/laplace_pdf.m,
scripts/statistics/distributions/logistic_cdf.m,
scripts/statistics/distributions/logistic_pdf.m,
scripts/statistics/distributions/lognrnd.m,
scripts/statistics/distributions/nbincdf.m,
scripts/statistics/distributions/nbininv.m,
scripts/statistics/distributions/nbinpdf.m,
scripts/statistics/distributions/nbinrnd.m,
scripts/statistics/distributions/normrnd.m,
scripts/statistics/distributions/poissinv.m,
scripts/statistics/distributions/poissrnd.m,
scripts/statistics/distributions/tinv.m,
scripts/statistics/distributions/trnd.m,
scripts/statistics/distributions/unidcdf.m,
scripts/statistics/distributions/unidpdf.m,
scripts/statistics/distributions/unidrnd.m,
scripts/statistics/distributions/unifrnd.m,
scripts/statistics/distributions/wblrnd.m,
scripts/statistics/models/module.mk,
scripts/statistics/tests/kruskal_wallis_test.m,
scripts/strings/base2dec.m, scripts/strings/deblank.m,
scripts/strings/dec2base.m, scripts/strings/dec2bin.m,
scripts/strings/dec2hex.m, scripts/strings/mat2str.m,
scripts/strings/ostrsplit.m, scripts/strings/regexptranslate.m,
scripts/strings/str2num.m, scripts/strings/strcat.m,
scripts/strings/strjoin.m, scripts/strings/strsplit.m,
scripts/strings/strtok.m, scripts/strings/strtrim.m,
scripts/strings/strtrunc.m, scripts/strings/substr.m,
scripts/testfun/__run_test_suite__.m, scripts/testfun/speed.m,
scripts/testfun/test.m, scripts/time/asctime.m,
scripts/time/datenum.m, scripts/time/datevec.m,
scripts/time/weekday.m, src/Makefile.am, test/Makefile.am,
test/build-bc-overload-tests.sh, test/build-sparse-tests.sh,
test/jit.tst, test/line-continue.tst: Strip trailing whitespace.
author | John W. Eaton <jwe@octave.org> |
---|---|
date | Tue, 20 Jan 2015 08:26:57 -0500 |
parents | d63878346099 |
children | 4197fc428c7d |
line wrap: on
line source
## Copyright (C) 2007-2013 David Bateman ## Copyright (C) 2009-2010 VZLU Prague ## ## This file is part of Octave. ## ## Octave 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. ## ## Octave 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 Octave; see the file COPYING. If not, see ## <http://www.gnu.org/licenses/>. ## -*- texinfo -*- ## @deftypefn {Function File} {} accumarray (@var{subs}, @var{vals}, @var{sz}, @var{func}, @var{fillval}, @var{issparse}) ## @deftypefnx {Function File} {} accumarray (@var{subs}, @var{vals}, @dots{}) ## ## Create an array by accumulating the elements of a vector into the ## positions defined by their subscripts. The subscripts are defined by ## the rows of the matrix @var{subs} and the values by @var{vals}. Each ## row of @var{subs} corresponds to one of the values in @var{vals}. If ## @var{vals} is a scalar, it will be used for each of the row of ## @var{subs}. If @var{subs} is a cell array of vectors, all vectors ## must be of the same length, and the subscripts in the @var{k}th ## vector must correspond to the @var{k}th dimension of the result. ## ## The size of the matrix will be determined by the subscripts ## themselves. However, if @var{sz} is defined it determines the matrix ## size. The length of @var{sz} must correspond to the number of columns ## in @var{subs}. An exception is if @var{subs} has only one column, in ## which case @var{sz} may be the dimensions of a vector and the ## subscripts of @var{subs} are taken as the indices into it. ## ## The default action of @code{accumarray} is to sum the elements with ## the same subscripts. This behavior can be modified by defining the ## @var{func} function. This should be a function or function handle ## that accepts a column vector and returns a scalar. The result of the ## function should not depend on the order of the subscripts. ## ## The elements of the returned array that have no subscripts associated ## with them are set to zero. Defining @var{fillval} to some other value ## allows these values to be defined. This behavior changes, however, ## for certain values of @var{func}. If @var{func} is @code{min} ## (respectively, @code{max}) then the result will be filled with the ## minimum (respectively, maximum) integer if @var{vals} is of integral ## type, logical false (respectively, logical true) if @var{vals} is of ## logical type, zero if @var{fillval} is zero and all values are ## non-positive (respectively, non-negative), and NaN otherwise. ## ## By default @code{accumarray} returns a full matrix. If ## @var{issparse} is logically true, then a sparse matrix is returned ## instead. ## ## The following @code{accumarray} example constructs a frequency table ## that in the first column counts how many occurrences each number in ## the second column has, taken from the vector @var{x}. Note the usage ## of @code{unique} for assigning to all repeated elements of @var{x} ## the same index (@pxref{XREFunique,,unique}). ## ## @example ## @group ## @var{x} = [91, 92, 90, 92, 90, 89, 91, 89, 90, 100, 100, 100]; ## [@var{u}, ~, @var{j}] = unique (@var{x}); ## [accumarray(@var{j}', 1), @var{u}'] ## @result{} 2 89 ## 3 90 ## 2 91 ## 2 92 ## 3 100 ## @end group ## @end example ## ## Another example, where the result is a multi-dimensional 3-D array and ## the default value (zero) appears in the output: ## ## @example ## @group ## accumarray ([1, 1, 1; ## 2, 1, 2; ## 2, 3, 2; ## 2, 1, 2; ## 2, 3, 2], 101:105) ## @result{} ans(:,:,1) = [101, 0, 0; 0, 0, 0] ## @result{} ans(:,:,2) = [0, 0, 0; 206, 0, 208] ## @end group ## @end example ## ## The sparse option can be used as an alternative to the @code{sparse} ## constructor (@pxref{XREFsparse,,sparse}). Thus ## ## @example ## sparse (@var{i}, @var{j}, @var{sv}) ## @end example ## ## @noindent ## can be written with @code{accumarray} as ## ## @example ## accumarray ([@var{i}, @var{j}], @var{sv}', [], [], 0, true) ## @end example ## ## @noindent ## For repeated indices, @code{sparse} adds the corresponding value. To ## take the minimum instead, use @code{min} as an accumulator function: ## ## @example ## accumarray ([@var{i}, @var{j}], @var{sv}', [], @@min, 0, true) ## @end example ## ## The complexity of accumarray in general for the non-sparse case is ## generally O(M+N), where N is the number of subscripts and M is the ## maximum subscript (linearized in multi-dimensional case). If ## @var{func} is one of @code{@@sum} (default), @code{@@max}, ## @code{@@min} or @code{@@(x) @{x@}}, an optimized code path is used. ## Note that for general reduction function the interpreter overhead can ## play a major part and it may be more efficient to do multiple ## accumarray calls and compute the results in a vectorized manner. ## ## @seealso{accumdim, unique, sparse} ## @end deftypefn function A = accumarray (subs, vals, sz = [], func = [], fillval = [], issparse = []) if (nargin < 2 || nargin > 6) print_usage (); endif lenvals = length (vals); if (iscell (subs)) subs = cellfun (@vec, subs, "uniformoutput", false); ndims = numel (subs); if (ndims == 1) subs = subs{1}; endif lensubs = cellfun (@length, subs); if (any (lensubs != lensubs(1)) || (lenvals > 1 && lenvals != lensubs(1))) error ("accumarray: dimension mismatch"); endif else ndims = columns (subs); if (lenvals > 1 && lenvals != rows (subs)) error ("accumarray: dimension mismatch"); endif endif if (isempty (fillval)) fillval = 0; endif if (isempty (issparse)) issparse = false; endif if (issparse) ## Sparse case. Avoid linearizing the subscripts, because it could ## overflow. if (fillval != 0) error ("accumarray: FILLVAL must be zero in the sparse case"); endif ## Ensure subscripts are a two-column matrix. if (iscell (subs)) subs = [subs{:}]; endif ## Validate dimensions. if (ndims == 1) subs(:,2) = 1; elseif (ndims != 2) error ("accumarray: in the sparse case, needs 1 or 2 subscripts"); endif if (isnumeric (vals) || islogical (vals)) vals = double (vals); else error ("accumarray: in the sparse case, values must be numeric or logical"); endif if (! (isempty (func) || func == @sum)) ## Reduce values. This is not needed if we're about to sum them, ## because "sparse" can do that. ## Sort indices. [subs, idx] = sortrows (subs); n = rows (subs); ## Identify runs. jdx = find (any (diff (subs, 1, 1), 2)); jdx = [jdx; n]; vals = cellfun (func, mat2cell (vals(:)(idx), diff ([0; jdx]))); subs = subs(jdx, :); mode = "unique"; else mode = "sum"; endif ## Form the sparse matrix. if (isempty (sz)) A = sparse (subs(:,1), subs(:,2), vals, mode); elseif (length (sz) == 2) ## Row vector case if (sz(1) == 1) [i, j] = deal (subs(:,2), subs(:,1)); else [i, j] = deal (subs(:,1), subs(:,2)); endif A = sparse (i, j, vals, sz(1), sz(2), mode); else error ("accumarray: dimensions mismatch"); endif else ## Linearize subscripts. if (ndims > 1) if (isempty (sz)) if (iscell (subs)) sz = cellfun ("max", subs); else sz = max (subs, [], 1); endif elseif (ndims != length (sz)) error ("accumarray: dimensions mismatch"); endif ## Convert multidimensional subscripts. if (ismatrix (subs)) subs = num2cell (subs, 1); endif subs = sub2ind (sz, subs{:}); # creates index cache elseif (! isempty (sz) && length (sz) < 2) error ("accumarray: needs at least 2 dimensions"); elseif (! isindex (subs)) # creates index cache error ("accumarray: indices must be positive integers"); endif ## Some built-in reductions handled efficiently. if (isempty (func) || func == @sum) ## Fast summation. if (isempty (sz)) A = __accumarray_sum__ (subs, vals); else A = __accumarray_sum__ (subs, vals, prod (sz)); ## set proper shape. A = reshape (A, sz); endif ## we fill in nonzero fill value. if (fillval != 0) mask = true (size (A)); mask(subs) = false; A(mask) = fillval; endif elseif (func == @max) ## Fast maximization. if (isinteger (vals)) zero = intmin (class (vals)); elseif (islogical (vals)) zero = false; elseif (fillval == 0 && all (vals(:) >= 0)) ## This is a common case - fillval is zero, all numbers ## nonegative. zero = 0; else zero = NaN; # Neutral value. endif if (isempty (sz)) A = __accumarray_max__ (subs, vals, zero); else A = __accumarray_max__ (subs, vals, zero, prod (sz)); A = reshape (A, sz); endif if (fillval != zero && ! (isnan (fillval) || isnan (zero))) mask = true (size (A)); mask(subs) = false; A(mask) = fillval; endif elseif (func == @min) ## Fast minimization. if (isinteger (vals)) zero = intmax (class (vals)); elseif (islogical (vals)) zero = true; elseif (fillval == 0 && all (vals(:) <= 0)) ## This is a common case - fillval is zero, all numbers ## non-positive. zero = 0; else zero = NaN; # Neutral value. endif if (isempty (sz)) A = __accumarray_min__ (subs, vals, zero); else A = __accumarray_min__ (subs, vals, zero, prod (sz)); A = reshape (A, sz); endif if (fillval != zero && ! (isnan (fillval) || isnan (zero))) mask = true (size (A)); mask(subs) = false; A(mask) = fillval; endif else ## The general case. Reduce values. n = rows (subs); if (numel (vals) == 1) vals = vals(ones (1, n), 1); else vals = vals(:); endif ## Sort indices. [subs, idx] = sort (subs); ## Identify runs. jdx = find (subs(1:n-1) != subs(2:n)); jdx = [jdx; n]; vals = mat2cell (vals(idx), diff ([0; jdx])); ## Optimize the case when function is @(x) {x}, i.e. we just want ## to collect the values to cells. persistent simple_cell_str = func2str (@(x) {x}); if (! strcmp (func2str (func), simple_cell_str)) vals = cellfun (func, vals); endif subs = subs(jdx); if (isempty (sz)) sz = max (subs); if (length (sz) == 1) sz(2) = 1; endif endif ## Construct matrix of fillvals. if (iscell (vals)) A = cell (sz); elseif (fillval == 0) A = zeros (sz, class (vals)); else A = repmat (fillval, sz); endif ## Set the reduced values. A(subs) = vals; endif endif endfunction %!assert (accumarray ([1;2;4;2;4],101:105), [101;206;0;208]) %!assert (accumarray ([1,1,1;2,1,2;2,3,2;2,1,2;2,3,2],101:105), cat (3, [101,0,0;0,0,0],[0,0,0;206,0,208])) %!assert (accumarray ([1,1,1;2,1,2;2,3,2;2,1,2;2,3,2],101:105,[],@(x)sin(sum(x))), sin (cat (3, [101,0,0;0,0,0],[0,0,0;206,0,208]))) %!assert (accumarray ({[1 3 3 2 3 1 2 2 3 3 1 2],[3 4 2 1 4 3 4 2 2 4 3 4],[1 1 2 2 1 1 2 1 1 1 2 2]},101:112), cat (3, [0,0,207,0;0,108,0,0;0,109,0,317], [0,0,111,0;104,0,0,219;0,103,0,0])) %!assert (accumarray ([1,1;2,1;2,3;2,1;2,3],101:105,[2,4],@max,NaN), [101,NaN,NaN,NaN;104,NaN,105,NaN]) %!assert (accumarray ([1 1; 2 1; 2 3; 2 1; 2 3],101:105, [], @prod), [101, 0, 0; 10608, 0, 10815]) %!assert (accumarray ([1 1; 2 1; 2 3; 2 1; 2 3],101:105,[2 4],@prod,0,true), sparse ([1,2,2],[1,1,3],[101,10608,10815],2,4)) %!assert (accumarray ([1 1; 2 1; 2 3; 2 1; 2 3],1,[2,4]), [1,0,0,0;2,0,2,0]) %!assert (accumarray ([1 1; 2 1; 2 3; 2 1; 2 3],101:105,[2,4],@(x)length(x)>1), [false,false,false,false;true,false,true,false]) %!assert (accumarray ([1; 2], [3; 4], [2, 1], @min, [], 0), [3; 4]) %!assert (accumarray ([1; 2], [3; 4], [2, 1], @min, [], 1), sparse ([3; 4])) %!assert (accumarray ([1; 2], [3; 4], [1, 2], @min, [], 0), [3, 4]) %!assert (accumarray ([1; 2], [3; 4], [1, 2], @min, [], 1), sparse ([3, 4])) %!test %! A = accumarray ([1 1; 2 1; 2 3; 2 1; 2 3], 101:105, [2,4], @(x){x}); %! assert (A{2},[102;104]); %!test %! subs = ceil (rand (2000, 3)*10); %! vals = rand (2000, 1); %! assert (accumarray (subs, vals, [], @max), accumarray (subs, vals, [], @(x) max (x))); %!test %! subs = ceil (rand (2000, 1)*100); %! vals = rand (2000, 1); %! assert (accumarray (subs, vals, [100, 1], @min, NaN), accumarray (subs, vals, [100, 1], @(x) min (x), NaN)); %!test %! subs = ceil (rand (2000, 2)*30); %! subsc = num2cell (subs, 1); %! vals = rand (2000, 1); %! assert (accumarray (subsc, vals, [], [], 0, true), accumarray (subs, vals, [], [], 0, true)); %!test %! subs = ceil (rand (2000, 3)*10); %! subsc = num2cell (subs, 1); %! vals = rand (2000, 1); %! assert (accumarray (subsc, vals, [], @max), accumarray (subs, vals, [], @max)); %!error (accumarray (1:5)) %!error (accumarray ([1,2,3],1:2))