Mercurial > octave-nkf
view libinterp/corefcn/find.cc @ 17281:bc924baa2c4e
doc: Add new @qcode macro for code samples which are quoted.
Macro handles options ("on") or properties ("position") more elegantly
than @code{"text"}.
* doc/interpreter/macros.texi: Add new @qcode macro.
* doc/interpreter/tips.txi: Add documentation about @qcode macro.
* doc/interpreter/basics.txi, doc/interpreter/container.txi,
doc/interpreter/emacs.txi, doc/interpreter/errors.txi,
doc/interpreter/eval.txi, doc/interpreter/expr.txi,
doc/interpreter/external.txi, doc/interpreter/func.txi,
doc/interpreter/grammar.txi, doc/interpreter/image.txi,
doc/interpreter/install.txi, doc/interpreter/interp.txi,
doc/interpreter/io.txi, doc/interpreter/matrix.txi,
doc/interpreter/numbers.txi, doc/interpreter/oop.txi,
doc/interpreter/package.txi, doc/interpreter/plot.txi,
doc/interpreter/quad.txi, doc/interpreter/sparse.txi,
doc/interpreter/strings.txi, doc/interpreter/system.txi,
doc/interpreter/vectorize.txi, libinterp/corefcn/balance.cc,
libinterp/corefcn/bitfcns.cc, libinterp/corefcn/cellfun.cc,
libinterp/corefcn/conv2.cc, libinterp/corefcn/data.cc,
libinterp/corefcn/debug.cc, libinterp/corefcn/defaults.cc,
libinterp/corefcn/dirfns.cc, libinterp/corefcn/dlmread.cc,
libinterp/corefcn/error.cc, libinterp/corefcn/file-io.cc,
libinterp/corefcn/find.cc, libinterp/corefcn/gammainc.cc,
libinterp/corefcn/graphics.cc, libinterp/corefcn/help.cc,
libinterp/corefcn/hex2num.cc, libinterp/corefcn/input.cc,
libinterp/corefcn/load-path.cc, libinterp/corefcn/load-save.cc,
libinterp/corefcn/ls-oct-ascii.cc, libinterp/corefcn/lu.cc,
libinterp/corefcn/luinc.cc, libinterp/corefcn/matrix_type.cc,
libinterp/corefcn/oct-hist.cc, libinterp/corefcn/pager.cc,
libinterp/corefcn/pr-output.cc, libinterp/corefcn/pt-jit.cc,
libinterp/corefcn/qz.cc, libinterp/corefcn/rand.cc,
libinterp/corefcn/regexp.cc, libinterp/corefcn/schur.cc,
libinterp/corefcn/sighandlers.cc, libinterp/corefcn/sparse.cc,
libinterp/corefcn/spparms.cc, libinterp/corefcn/str2double.cc,
libinterp/corefcn/svd.cc, libinterp/corefcn/symtab.cc,
libinterp/corefcn/syscalls.cc, libinterp/corefcn/toplev.cc,
libinterp/corefcn/tril.cc, libinterp/corefcn/typecast.cc,
libinterp/corefcn/utils.cc, libinterp/corefcn/variables.cc,
libinterp/dldfcn/__init_fltk__.cc, libinterp/dldfcn/chol.cc,
libinterp/dldfcn/colamd.cc, libinterp/dldfcn/fftw.cc, libinterp/dldfcn/qr.cc,
libinterp/dldfcn/symbfact.cc, libinterp/octave-value/ov-base.cc,
libinterp/octave-value/ov-fcn-handle.cc,
libinterp/octave-value/ov-fcn-inline.cc, libinterp/octave-value/ov-java.cc,
libinterp/octave-value/ov-range.cc, libinterp/octave-value/ov-struct.cc,
libinterp/octave-value/ov-usr-fcn.cc, libinterp/parse-tree/oct-parse.in.yy,
libinterp/parse-tree/pt-binop.cc, libinterp/parse-tree/pt-eval.cc,
libinterp/parse-tree/pt-mat.cc, scripts/@ftp/ftp.m,
scripts/deprecated/java_convert_matrix.m, scripts/deprecated/java_debug.m,
scripts/deprecated/java_unsigned_conversion.m, scripts/deprecated/shell_cmd.m,
scripts/general/dblquad.m, scripts/general/display.m,
scripts/general/genvarname.m, scripts/general/idivide.m,
scripts/general/interp1.m, scripts/general/interp2.m,
scripts/general/interp3.m, scripts/general/interpn.m, scripts/general/isa.m,
scripts/general/profexplore.m, scripts/general/profile.m,
scripts/general/quadgk.m, scripts/general/randi.m, scripts/general/structfun.m,
scripts/general/subsindex.m, scripts/general/triplequad.m,
scripts/geometry/griddata.m, scripts/geometry/griddata3.m,
scripts/geometry/griddatan.m, scripts/geometry/voronoi.m, scripts/help/help.m,
scripts/help/lookfor.m, scripts/image/cmpermute.m, scripts/image/colormap.m,
scripts/image/image.m, scripts/image/imagesc.m, scripts/image/imfinfo.m,
scripts/image/imformats.m, scripts/image/imread.m, scripts/image/imshow.m,
scripts/image/imwrite.m, scripts/image/ind2gray.m, scripts/image/lines.m,
scripts/image/rgb2ind.m, scripts/image/spinmap.m, scripts/io/dlmwrite.m,
scripts/io/strread.m, scripts/io/textread.m, scripts/io/textscan.m,
scripts/java/javaclasspath.m, scripts/java/usejava.m,
scripts/miscellaneous/bzip2.m, scripts/miscellaneous/computer.m,
scripts/miscellaneous/copyfile.m, scripts/miscellaneous/debug.m,
scripts/miscellaneous/dos.m, scripts/miscellaneous/edit.m,
scripts/miscellaneous/gzip.m, scripts/miscellaneous/license.m,
scripts/miscellaneous/mkoctfile.m, scripts/miscellaneous/movefile.m,
scripts/miscellaneous/parseparams.m, scripts/miscellaneous/unix.m,
scripts/optimization/fminbnd.m, scripts/optimization/fminsearch.m,
scripts/optimization/fminunc.m, scripts/optimization/fsolve.m,
scripts/optimization/fzero.m, scripts/optimization/glpk.m,
scripts/optimization/lsqnonneg.m, scripts/optimization/optimset.m,
scripts/optimization/pqpnonneg.m, scripts/pkg/pkg.m, scripts/plot/allchild.m,
scripts/plot/ancestor.m, scripts/plot/area.m, scripts/plot/axis.m,
scripts/plot/bar.m, scripts/plot/barh.m, scripts/plot/box.m,
scripts/plot/caxis.m, scripts/plot/cla.m, scripts/plot/clabel.m,
scripts/plot/clf.m, scripts/plot/close.m, scripts/plot/colorbar.m,
scripts/plot/daspect.m, scripts/plot/ezmesh.m, scripts/plot/ezmeshc.m,
scripts/plot/ezsurf.m, scripts/plot/ezsurfc.m, scripts/plot/findall.m,
scripts/plot/findobj.m, scripts/plot/gcbo.m, scripts/plot/gcf.m,
scripts/plot/gco.m, scripts/plot/grid.m, scripts/plot/guihandles.m,
scripts/plot/hdl2struct.m, scripts/plot/hidden.m, scripts/plot/hold.m,
scripts/plot/isonormals.m, scripts/plot/isosurface.m, scripts/plot/legend.m,
scripts/plot/mesh.m, scripts/plot/meshc.m, scripts/plot/meshz.m,
scripts/plot/newplot.m, scripts/plot/orient.m, scripts/plot/pareto.m,
scripts/plot/patch.m, scripts/plot/pbaspect.m, scripts/plot/pcolor.m,
scripts/plot/plot.m, scripts/plot/print.m,
scripts/plot/private/__add_default_menu__.m, scripts/plot/quiver.m,
scripts/plot/quiver3.m, scripts/plot/refreshdata.m, scripts/plot/saveas.m,
scripts/plot/scatter.m, scripts/plot/scatter3.m, scripts/plot/shading.m,
scripts/plot/shrinkfaces.m, scripts/plot/slice.m, scripts/plot/stem.m,
scripts/plot/stem3.m, scripts/plot/struct2hdl.m, scripts/plot/subplot.m,
scripts/plot/surf.m, scripts/plot/surfc.m, scripts/plot/surfl.m,
scripts/plot/tetramesh.m, scripts/plot/uigetfile.m, scripts/plot/uimenu.m,
scripts/plot/uiputfile.m, scripts/plot/waterfall.m, scripts/plot/whitebg.m,
scripts/plot/xlim.m, scripts/plot/ylim.m, scripts/plot/zlim.m,
scripts/polynomial/conv.m, scripts/polynomial/polyout.m,
scripts/polynomial/splinefit.m, scripts/set/ismember.m, scripts/set/powerset.m,
scripts/set/setdiff.m, scripts/set/union.m, scripts/set/unique.m,
scripts/signal/detrend.m, scripts/signal/filter2.m, scripts/signal/freqz.m,
scripts/signal/periodogram.m, scripts/signal/spectral_adf.m,
scripts/signal/spectral_xdf.m, scripts/sparse/eigs.m, scripts/sparse/svds.m,
scripts/specfun/legendre.m, scripts/special-matrix/gallery.m,
scripts/statistics/base/mean.m, scripts/statistics/base/moment.m,
scripts/statistics/tests/cor_test.m,
scripts/statistics/tests/kolmogorov_smirnov_test.m,
scripts/statistics/tests/kolmogorov_smirnov_test_2.m,
scripts/statistics/tests/kruskal_wallis_test.m,
scripts/statistics/tests/prop_test_2.m, scripts/statistics/tests/sign_test.m,
scripts/statistics/tests/t_test.m, scripts/statistics/tests/t_test_2.m,
scripts/statistics/tests/t_test_regression.m,
scripts/statistics/tests/u_test.m, scripts/statistics/tests/var_test.m,
scripts/statistics/tests/welch_test.m,
scripts/statistics/tests/wilcoxon_test.m, scripts/statistics/tests/z_test.m,
scripts/statistics/tests/z_test_2.m, scripts/strings/base2dec.m,
scripts/strings/index.m, scripts/strings/isstrprop.m,
scripts/strings/mat2str.m, scripts/strings/regexptranslate.m,
scripts/strings/rindex.m, scripts/strings/str2num.m, scripts/strings/strcat.m,
scripts/strings/strjust.m, scripts/strings/strmatch.m,
scripts/strings/validatestring.m, scripts/testfun/demo.m,
scripts/testfun/example.m, scripts/testfun/test.m, scripts/time/addtodate.m,
scripts/time/asctime.m, scripts/time/datestr.m, scripts/time/datetick.m,
scripts/time/weekday.m, scripts/ui/errordlg.m, scripts/ui/helpdlg.m,
scripts/ui/inputdlg.m, scripts/ui/listdlg.m, scripts/ui/msgbox.m,
scripts/ui/questdlg.m, scripts/ui/warndlg.m: Use new @qcode macro.
author | Rik <rik@octave.org> |
---|---|
date | Mon, 19 Aug 2013 20:46:38 -0700 |
parents | 2fc554ffbc28 |
children | d63878346099 |
line wrap: on
line source
/* Copyright (C) 1996-2012 John W. Eaton 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/>. */ #ifdef HAVE_CONFIG_H #include <config.h> #endif #include "quit.h" #include "defun.h" #include "error.h" #include "gripes.h" #include "oct-obj.h" // Find at most N_TO_FIND nonzero elements in NDA. Search forward if // DIRECTION is 1, backward if it is -1. NARGOUT is the number of // output arguments. If N_TO_FIND is -1, find all nonzero elements. template <typename T> octave_value_list find_nonzero_elem_idx (const Array<T>& nda, int nargout, octave_idx_type n_to_find, int direction) { octave_value_list retval ((nargout == 0 ? 1 : nargout), Matrix ()); Array<octave_idx_type> idx; if (n_to_find >= 0) idx = nda.find (n_to_find, direction == -1); else idx = nda.find (); // The maximum element is always at the end. octave_idx_type iext = idx.is_empty () ? 0 : idx.xelem (idx.numel () - 1) + 1; switch (nargout) { default: case 3: retval(2) = Array<T> (nda.index (idx_vector (idx))); // Fall through! case 2: { Array<octave_idx_type> jdx (idx.dims ()); octave_idx_type n = idx.length (), nr = nda.rows (); for (octave_idx_type i = 0; i < n; i++) { jdx.xelem (i) = idx.xelem (i) / nr; idx.xelem (i) %= nr; } iext = -1; retval(1) = idx_vector (jdx, -1); } // Fall through! case 1: case 0: retval(0) = idx_vector (idx, iext); break; } return retval; } template <typename T> octave_value_list find_nonzero_elem_idx (const Sparse<T>& v, int nargout, octave_idx_type n_to_find, int direction) { octave_value_list retval ((nargout == 0 ? 1 : nargout), Matrix ()); octave_idx_type nc = v.cols (); octave_idx_type nr = v.rows (); octave_idx_type nz = v.nnz (); // Search in the default range. octave_idx_type start_nc = -1; octave_idx_type end_nc = -1; octave_idx_type count; // Search for the range to search if (n_to_find < 0) { start_nc = 0; end_nc = nc; n_to_find = nz; count = nz; } else if (direction > 0) { for (octave_idx_type j = 0; j < nc; j++) { OCTAVE_QUIT; if (v.cidx (j) == 0 && v.cidx (j+1) != 0) start_nc = j; if (v.cidx (j+1) >= n_to_find) { end_nc = j + 1; break; } } } else { for (octave_idx_type j = nc; j > 0; j--) { OCTAVE_QUIT; if (v.cidx (j) == nz && v.cidx (j-1) != nz) end_nc = j; if (nz - v.cidx (j-1) >= n_to_find) { start_nc = j - 1; break; } } } count = (n_to_find > v.cidx (end_nc) - v.cidx (start_nc) ? v.cidx (end_nc) - v.cidx (start_nc) : n_to_find); // If the original argument was a row vector, force a row vector of // the overall indices to be returned. But see below for scalar // case... octave_idx_type result_nr = count; octave_idx_type result_nc = 1; bool scalar_arg = false; if (v.rows () == 1) { result_nr = 1; result_nc = count; scalar_arg = (v.columns () == 1); } Matrix idx (result_nr, result_nc); Matrix i_idx (result_nr, result_nc); Matrix j_idx (result_nr, result_nc); Array<T> val (dim_vector (result_nr, result_nc)); if (count > 0) { // Search for elements to return. Only search the region where // there are elements to be found using the count that we want // to find. for (octave_idx_type j = start_nc, cx = 0; j < end_nc; j++) for (octave_idx_type i = v.cidx (j); i < v.cidx (j+1); i++ ) { OCTAVE_QUIT; if (direction < 0 && i < nz - count) continue; i_idx(cx) = static_cast<double> (v.ridx (i) + 1); j_idx(cx) = static_cast<double> (j + 1); idx(cx) = j * nr + v.ridx (i) + 1; val(cx) = v.data(i); cx++; if (cx == count) break; } } else if (scalar_arg) { idx.resize (0, 0); i_idx.resize (0, 0); j_idx.resize (0, 0); val.resize (dim_vector (0, 0)); } switch (nargout) { case 0: case 1: retval(0) = idx; break; case 5: retval(4) = nc; // Fall through case 4: retval(3) = nr; // Fall through case 3: retval(2) = val; // Fall through! case 2: retval(1) = j_idx; retval(0) = i_idx; break; default: panic_impossible (); break; } return retval; } octave_value_list find_nonzero_elem_idx (const PermMatrix& v, int nargout, octave_idx_type n_to_find, int direction) { // There are far fewer special cases to handle for a PermMatrix. octave_value_list retval ((nargout == 0 ? 1 : nargout), Matrix ()); octave_idx_type nc = v.cols (); octave_idx_type start_nc, count; // Determine the range to search. if (n_to_find < 0 || n_to_find >= nc) { start_nc = 0; n_to_find = nc; count = nc; } else if (direction > 0) { start_nc = 0; count = n_to_find; } else { start_nc = nc - n_to_find; count = n_to_find; } bool scalar_arg = (v.rows () == 1 && v.cols () == 1); Matrix idx (count, 1); Matrix i_idx (count, 1); Matrix j_idx (count, 1); // Every value is 1. Array<double> val (dim_vector (count, 1), 1.0); if (count > 0) { const octave_idx_type* p = v.data (); if (v.is_col_perm ()) { for (octave_idx_type k = 0; k < count; k++) { OCTAVE_QUIT; const octave_idx_type j = start_nc + k; const octave_idx_type i = p[j]; i_idx(k) = static_cast<double> (1+i); j_idx(k) = static_cast<double> (1+j); idx(k) = j * nc + i + 1; } } else { for (octave_idx_type k = 0; k < count; k++) { OCTAVE_QUIT; const octave_idx_type i = start_nc + k; const octave_idx_type j = p[i]; // Scatter into the index arrays according to // j adjusted by the start point. const octave_idx_type koff = j - start_nc; i_idx(koff) = static_cast<double> (1+i); j_idx(koff) = static_cast<double> (1+j); idx(koff) = j * nc + i + 1; } } } else if (scalar_arg) { // Same odd compatibility case as the other overrides. idx.resize (0, 0); i_idx.resize (0, 0); j_idx.resize (0, 0); val.resize (dim_vector (0, 0)); } switch (nargout) { case 0: case 1: retval(0) = idx; break; case 5: retval(4) = nc; // Fall through case 4: retval(3) = nc; // Fall through case 3: retval(2) = val; // Fall through! case 2: retval(1) = j_idx; retval(0) = i_idx; break; default: panic_impossible (); break; } return retval; } DEFUN (find, args, nargout, "-*- texinfo -*-\n\ @deftypefn {Built-in Function} {@var{idx} =} find (@var{x})\n\ @deftypefnx {Built-in Function} {@var{idx} =} find (@var{x}, @var{n})\n\ @deftypefnx {Built-in Function} {@var{idx} =} find (@var{x}, @var{n}, @var{direction})\n\ @deftypefnx {Built-in Function} {[i, j] =} find (@dots{})\n\ @deftypefnx {Built-in Function} {[i, j, v] =} find (@dots{})\n\ Return a vector of indices of nonzero elements of a matrix, as a row if\n\ @var{x} is a row vector or as a column otherwise. To obtain a single index\n\ for each matrix element, Octave pretends that the columns of a matrix form\n\ one long vector (like Fortran arrays are stored). For example:\n\ \n\ @example\n\ @group\n\ find (eye (2))\n\ @result{} [ 1; 4 ]\n\ @end group\n\ @end example\n\ \n\ If two outputs are requested, @code{find} returns the row and column\n\ indices of nonzero elements of a matrix. For example:\n\ \n\ @example\n\ @group\n\ [i, j] = find (2 * eye (2))\n\ @result{} i = [ 1; 2 ]\n\ @result{} j = [ 1; 2 ]\n\ @end group\n\ @end example\n\ \n\ If three outputs are requested, @code{find} also returns a vector\n\ containing the nonzero values. For example:\n\ \n\ @example\n\ @group\n\ [i, j, v] = find (3 * eye (2))\n\ @result{} i = [ 1; 2 ]\n\ @result{} j = [ 1; 2 ]\n\ @result{} v = [ 3; 3 ]\n\ @end group\n\ @end example\n\ \n\ If two inputs are given, @var{n} indicates the maximum number of\n\ elements to find from the beginning of the matrix or vector.\n\ \n\ If three inputs are given, @var{direction} should be one of\n\ @qcode{\"first\"} or @qcode{\"last\"}, requesting only the first or last\n\ @var{n} indices, respectively. However, the indices are always returned in\n\ ascending order.\n\ \n\ Note that this function is particularly useful for sparse matrices, as\n\ it extracts the non-zero elements as vectors, which can then be used to\n\ create the original matrix. For example:\n\ \n\ @example\n\ @group\n\ sz = size (a);\n\ [i, j, v] = find (a);\n\ b = sparse (i, j, v, sz(1), sz(2));\n\ @end group\n\ @end example\n\ @seealso{nonzeros}\n\ @end deftypefn") { octave_value_list retval; int nargin = args.length (); if (nargin > 3 || nargin < 1) { print_usage (); return retval; } // Setup the default options. octave_idx_type n_to_find = -1; if (nargin > 1) { double val = args(1).scalar_value (); if (error_state || (val < 0 || (! xisinf (val) && val != xround (val)))) { error ("find: N must be a non-negative integer"); return retval; } else if (! xisinf (val)) n_to_find = val; } // Direction to do the searching (1 == forward, -1 == reverse). int direction = 1; if (nargin > 2) { direction = 0; std::string s_arg = args(2).string_value (); if (! error_state) { if (s_arg == "first") direction = 1; else if (s_arg == "last") direction = -1; } if (direction == 0) { error ("find: DIRECTION must be \"first\" or \"last\""); return retval; } } octave_value arg = args(0); if (arg.is_bool_type ()) { if (arg.is_sparse_type ()) { SparseBoolMatrix v = arg.sparse_bool_matrix_value (); if (! error_state) retval = find_nonzero_elem_idx (v, nargout, n_to_find, direction); } else if (nargout <= 1 && n_to_find == -1 && direction == 1) { // This case is equivalent to extracting indices from a logical // matrix. Try to reuse the possibly cached index vector. retval(0) = arg.index_vector ().unmask (); } else { boolNDArray v = arg.bool_array_value (); if (! error_state) retval = find_nonzero_elem_idx (v, nargout, n_to_find, direction); } } else if (arg.is_integer_type ()) { #define DO_INT_BRANCH(INTT) \ else if (arg.is_ ## INTT ## _type ()) \ { \ INTT ## NDArray v = arg.INTT ## _array_value (); \ \ if (! error_state) \ retval = find_nonzero_elem_idx (v, nargout, \ n_to_find, direction);\ } if (false) ; DO_INT_BRANCH (int8) DO_INT_BRANCH (int16) DO_INT_BRANCH (int32) DO_INT_BRANCH (int64) DO_INT_BRANCH (uint8) DO_INT_BRANCH (uint16) DO_INT_BRANCH (uint32) DO_INT_BRANCH (uint64) else panic_impossible (); } else if (arg.is_sparse_type ()) { if (arg.is_real_type ()) { SparseMatrix v = arg.sparse_matrix_value (); if (! error_state) retval = find_nonzero_elem_idx (v, nargout, n_to_find, direction); } else if (arg.is_complex_type ()) { SparseComplexMatrix v = arg.sparse_complex_matrix_value (); if (! error_state) retval = find_nonzero_elem_idx (v, nargout, n_to_find, direction); } else gripe_wrong_type_arg ("find", arg); } else if (arg.is_perm_matrix ()) { PermMatrix P = arg.perm_matrix_value (); if (! error_state) retval = find_nonzero_elem_idx (P, nargout, n_to_find, direction); } else if (arg.is_string ()) { charNDArray chnda = arg.char_array_value (); if (! error_state) retval = find_nonzero_elem_idx (chnda, nargout, n_to_find, direction); } else if (arg.is_single_type ()) { if (arg.is_real_type ()) { FloatNDArray nda = arg.float_array_value (); if (! error_state) retval = find_nonzero_elem_idx (nda, nargout, n_to_find, direction); } else if (arg.is_complex_type ()) { FloatComplexNDArray cnda = arg.float_complex_array_value (); if (! error_state) retval = find_nonzero_elem_idx (cnda, nargout, n_to_find, direction); } } else if (arg.is_real_type ()) { NDArray nda = arg.array_value (); if (! error_state) retval = find_nonzero_elem_idx (nda, nargout, n_to_find, direction); } else if (arg.is_complex_type ()) { ComplexNDArray cnda = arg.complex_array_value (); if (! error_state) retval = find_nonzero_elem_idx (cnda, nargout, n_to_find, direction); } else gripe_wrong_type_arg ("find", arg); return retval; } /* %!assert (find (char ([0, 97])), 2) %!assert (find ([1, 0, 1, 0, 1]), [1, 3, 5]) %!assert (find ([1; 0; 3; 0; 1]), [1; 3; 5]) %!assert (find ([0, 0, 2; 0, 3, 0; -1, 0, 0]), [3; 5; 7]) %!test %! [i, j, v] = find ([0, 0, 2; 0, 3, 0; -1, 0, 0]); %! %! assert (i, [3; 2; 1]); %! assert (j, [1; 2; 3]); %! assert (v, [-1; 3; 2]); %!assert (find (single ([1, 0, 1, 0, 1])), [1, 3, 5]) %!assert (find (single ([1; 0; 3; 0; 1])), [1; 3; 5]) %!assert (find (single ([0, 0, 2; 0, 3, 0; -1, 0, 0])), [3; 5; 7]) %!test %! [i, j, v] = find (single ([0, 0, 2; 0, 3, 0; -1, 0, 0])); %! %! assert (i, [3; 2; 1]); %! assert (j, [1; 2; 3]); %! assert (v, single ([-1; 3; 2])); %!test %! pcol = [5 1 4 3 2]; %! P = eye (5) (:, pcol); %! [i, j, v] = find (P); %! [ifull, jfull, vfull] = find (full (P)); %! assert (i, ifull); %! assert (j, jfull); %! assert (all (v == 1)); %!test %! prow = [5 1 4 3 2]; %! P = eye (5) (prow, :); %! [i, j, v] = find (P); %! [ifull, jfull, vfull] = find (full (P)); %! assert (i, ifull); %! assert (j, jfull); %! assert (all (v == 1)); %!assert (find ([2 0 1 0 5 0], 1), 1) %!assert (find ([2 0 1 0 5 0], 2, "last"), [3, 5]) %!assert (find ([2 0 1 0 5 0], Inf), [1, 3, 5]) %!assert (find ([2 0 1 0 5 0], Inf, "last"), [1, 3, 5]) %!error find () */