Mercurial > octave
annotate scripts/special-matrix/hankel.m @ 27898:4d6d21839dfd
remove Author: jwe and Adapted-by: jwe lines from source files
These lines have little meaning now in the age of modern version
control systems.
Files affected: url-transfer.cc, url-transfer.h, acot.m, acoth.m,
acsc.m, acsch.m, asec.m, asech.m, cot.m, coth.m, csc.m, csch.m, sec.m,
sech.m, cart2pol.m, cart2sph.m, deal.m, fliplr.m, flipud.m, int2str.m,
logspace.m, num2str.m, pol2cart.m, rot90.m, sortrows.m, sph2cart.m,
waitbar.m, doc.m, hsv2rgb.m, rgb2hsv.m, beep.m, isstr.m, setstr.m,
strmatch.m, cond.m, rank.m, trace.m, bug_report.m, cast.m, delete.m,
dir.m, list_primes.m, ls.m, ls_command.m, menu.m, pack.m, recycle.m,
substruct.m, version.m, glpk.m, axis.m, box.m, grid.m,
__axis_label__.m, text.m, title.m, view.m, xlabel.m, ylabel.m,
zlabel.m, bar.m, barh.m, comet3.m, hist.m, line.m, loglog.m, mesh.m,
patch.m, plot.m, polar.m, __bar__.m, __line__.m, __plt__.m,
__stem__.m, semilogx.m, semilogy.m, sombrero.m, stairs.m, stem.m,
surface.m, __default_plot_options__.m, __gnuplot_drawnow__.m,
__next_line_color__.m, __plt_get_axis_arg__.m, __pltopt__.m, clf.m,
closereq.m, gca.m, gnuplot_binary.in.m, isfigure.m, meshgrid.m,
__gnuplot_draw_axes__.m, __gnuplot_draw_figure__.m, shg.m, addpref.m,
getpref.m, ispref.m, loadprefs.m, prefsfile.m, saveprefs.m, rmpref.m,
setpref.m, ismember.m, setdiff.m, union.m, hankel.m, hilb.m, vander.m,
median.m, std.m, cstrcat.m, isletter.m, str2num.m, strcat.m,
oruntests.m, rundemos.m, asctime.m, clock.m, ctime.m, date.m, etime.m,
is_leap_year.m.
author | John W. Eaton <jwe@octave.org> |
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date | Thu, 02 Jan 2020 15:43:01 -0500 |
parents | 00f796120a6d |
children | b442ec6dda5c |
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1 ## Copyright (C) 1993-2019 John W. Eaton |
2313 | 2 ## |
3 ## This file is part of Octave. | |
4 ## | |
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5 ## Octave is free software: you can redistribute it and/or modify it |
2313 | 6 ## under the terms of the GNU General Public License as published by |
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7 ## the Free Software Foundation, either version 3 of the License, or |
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8 ## (at your option) any later version. |
2313 | 9 ## |
10 ## Octave is distributed in the hope that it will be useful, but | |
11 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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13 ## GNU General Public License for more details. |
2313 | 14 ## |
15 ## You should have received a copy of the GNU General Public License | |
7016 | 16 ## along with Octave; see the file COPYING. If not, see |
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17 ## <https://www.gnu.org/licenses/>. |
245 | 18 |
3369 | 19 ## -*- texinfo -*- |
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20 ## @deftypefn {} {} hankel (@var{c}) |
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21 ## @deftypefnx {} {} hankel (@var{c}, @var{r}) |
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22 ## Return the Hankel matrix constructed from the first column @var{c}, and |
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23 ## (optionally) the last row @var{r}. |
3426 | 24 ## |
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25 ## If the last element of @var{c} is not the same as the first element of |
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26 ## @var{r}, the last element of @var{c} is used. If the second argument is |
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27 ## omitted, it is assumed to be a vector of zeros with the same size as |
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28 ## @var{c}. |
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29 ## |
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30 ## A Hankel matrix formed from an m-vector @var{c}, and an n-vector @var{r}, |
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31 ## has the elements |
3369 | 32 ## @tex |
33 ## $$ | |
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34 ## H(i, j) = \cases{c_{i+j-1},&$i+j-1\le m$;\cr r_{i+j-m},&otherwise.\cr} |
3369 | 35 ## $$ |
36 ## @end tex | |
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37 ## @ifnottex |
3426 | 38 ## |
3369 | 39 ## @example |
40 ## @group | |
4922 | 41 ## H(i,j) = c(i+j-1), i+j-1 <= m; |
42 ## H(i,j) = r(i+j-m), otherwise | |
3369 | 43 ## @end group |
44 ## @end example | |
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45 ## |
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46 ## @end ifnottex |
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47 ## @seealso{hadamard, toeplitz} |
3369 | 48 ## @end deftypefn |
4 | 49 |
2311 | 50 function retval = hankel (c, r) |
4 | 51 |
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52 if (nargin < 1 || nargin > 2) |
6046 | 53 print_usage (); |
4 | 54 endif |
55 | |
2325 | 56 if (nargin == 1) |
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57 |
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58 if (! isvector (c)) |
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59 error ("hankel: C must be a vector"); |
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60 endif |
1396 | 61 |
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62 nr = length (c); |
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63 nc = nr; |
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64 data = [c(:) ; zeros(nr, 1)]; |
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65 |
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66 else |
4 | 67 |
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68 if (! (isvector (c) && isvector (r))) |
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69 error ("hankel: C and R must be vectors"); |
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70 elseif (r(1) != c(end)) |
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71 warning ("hankel: column wins anti-diagonal conflict"); |
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72 endif |
4 | 73 |
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74 nr = length (c); |
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75 nc = length (r); |
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76 data = [c(:) ; r(2:end)(:)]; |
1396 | 77 |
4 | 78 endif |
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79 |
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80 slices = cellslices (data, 1:nc, nr:1:nc+nr-1); |
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81 retval = horzcat (slices{:}); |
4 | 82 |
83 endfunction | |
5731 | 84 |
7411 | 85 |
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86 %!assert (hankel (1), [1]) |
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87 %!assert (hankel ([1, 2]), [1, 2; 2, 0]) |
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88 %!assert (hankel ([1, 2], [2; -1; -3]), [1, 2, -1; 2, -1, -3]) |
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89 %!assert (hankel (1:3), [1,2,3;2,3,0;3,0,0]) |
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90 %!assert (hankel (1:3,3:6), [1,2,3,4;2,3,4,5;3,4,5,6]) |
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91 %!assert (hankel (1:3,3:4), [1,2;2,3;3,4]) |
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92 %!warning <column wins anti-diagonal conflict> |
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93 %! assert (hankel (1:3,4:6), [1,2,3;2,3,5;3,5,6]); |
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95 %!error hankel () |
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96 %!error hankel (1, 2, 3) |
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97 %!error <C must be a vector> hankel ([1, 2; 3, 4]) |
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98 %!error <C and R must be vectors> hankel (1:4, [1, 2; 3, 4]) |