Mercurial > octave-nkf
annotate scripts/plot/compass.m @ 10549:95c3e38098bf
Untabify .m scripts
| author | Rik <code@nomad.inbox5.com> |
|---|---|
| date | Fri, 23 Apr 2010 11:28:50 -0700 |
| parents | 69a57c59868c |
| children | be55736a0783 |
| rev | line source |
|---|---|
| 9245 | 1 ## Copyright (C) 2007, 2008, 2009 David Bateman |
| 7322 | 2 ## |
| 3 ## This file is part of Octave. | |
| 4 ## | |
| 5 ## Octave is free software; you can redistribute it and/or modify it | |
| 6 ## under the terms of the GNU General Public License as published by | |
| 7 ## the Free Software Foundation; either version 3 of the License, or (at | |
| 8 ## your option) any later version. | |
| 9 ## | |
| 10 ## Octave is distributed in the hope that it will be useful, but | |
| 11 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 ## General Public License for more details. | |
| 14 ## | |
| 15 ## You should have received a copy of the GNU General Public License | |
| 16 ## along with Octave; see the file COPYING. If not, see | |
| 17 ## <http://www.gnu.org/licenses/>. | |
| 18 | |
| 19 ## -*- texinfo -*- | |
| 20 ## @deftypefn {Function File} {} compass (@var{u}, @var{v}) | |
| 21 ## @deftypefnx {Function File} {} compass (@var{z}) | |
| 22 ## @deftypefnx {Function File} {} compass (@dots{}, @var{style}) | |
| 23 ## @deftypefnx {Function File} {} compass (@var{h}, @dots{}) | |
| 24 ## @deftypefnx {Function File} {@var{h} =} compass (@dots{}) | |
| 25 ## | |
| 26 ## Plot the @code{(@var{u}, @var{v})} components of a vector field emanating | |
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27 ## from the origin of a polar plot. If a single complex argument @var{z} is |
| 7322 | 28 ## given, then @code{@var{u} = real (@var{z})} and @code{@var{v} = imag |
| 29 ## (@var{z})}. | |
| 30 ## | |
| 31 ## The style to use for the plot can be defined with a line style @var{style} | |
| 32 ## in a similar manner to the line styles used with the @code{plot} command. | |
| 33 ## | |
| 34 ## The optional return value @var{h} provides a list of handles to the | |
| 35 ## the parts of the vector field (body, arrow and marker). | |
| 36 ## | |
| 37 ## @example | |
| 38 ## @group | |
| 39 ## a = toeplitz([1;randn(9,1)],[1,randn(1,9)]); | |
| 40 ## compass (eig (a)) | |
| 41 ## @end group | |
| 42 ## @end example | |
| 43 ## | |
| 44 ## @seealso{plot, polar, quiver, feather} | |
| 45 ## @end deftypefn | |
| 46 | |
| 47 function retval = compass (varargin) | |
| 48 | |
| 49 [h, varargin, nargin] = __plt_get_axis_arg__ ("compass", varargin{:}); | |
| 50 | |
| 51 arrowsize = 0.25; | |
| 52 | |
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53 if (nargin == 0) |
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54 print_usage (); |
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55 elseif (nargin == 1 || (nargin == 2 && ! isnumeric (varargin{2}))) |
| 7322 | 56 ioff = 2; |
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57 z = varargin{1}(:).'; |
| 7322 | 58 u = real (z); |
| 59 v = imag (z); | |
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60 elseif (nargin > 1 && isnumeric (varargin{2})) |
| 7322 | 61 ioff = 3; |
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62 u = varargin{1}(:).'; |
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63 v = varargin{2}(:).'; |
| 7322 | 64 endif |
| 65 | |
| 66 line_spec = "b-"; | |
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67 have_line_spec = false; |
| 7322 | 68 while (ioff <= nargin) |
| 69 arg = varargin{ioff++}; | |
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70 if ((ischar (arg) || iscell (arg)) && ! have_line_spec) |
| 7322 | 71 [linespec, valid] = __pltopt__ ("compass", arg, false); |
| 72 if (valid) | |
| 10549 | 73 line_spec = arg; |
| 74 have_line_spec = true; | |
| 75 break; | |
| 7322 | 76 else |
| 10549 | 77 error ("compass: invalid linespec"); |
| 7322 | 78 endif |
| 79 else | |
| 80 error ("compass: unrecognized argument"); | |
| 81 endif | |
| 82 endwhile | |
| 83 | |
| 84 ## Matlab draws compass plots, with the arrow head as one continous | |
| 85 ## line, and each arrow separately. This is completely different than | |
| 86 ## quiver and quite ugly. | |
| 87 n = length (u); | |
| 88 xend = u; | |
| 89 xtmp = u .* (1 - arrowsize); | |
| 90 yend = v; | |
| 91 ytmp = v .* (1 - arrowsize); | |
| 92 x = [zeros(1, n); xend; xtmp - v * arrowsize / 3; xend; ... | |
| 93 xtmp + v * arrowsize / 3]; | |
| 94 y = [zeros(1, n); yend; ytmp + u * arrowsize / 3; yend; ... | |
| 95 ytmp - u * arrowsize / 3]; | |
| 96 [r, p] = cart2pol (x, y); | |
| 97 | |
| 98 oldh = gca (); | |
| 99 unwind_protect | |
| 100 axes (h); | |
| 101 newplot (); | |
| 102 hlist = polar (h, r, p, line_spec); | |
| 103 unwind_protect_cleanup | |
| 104 axes (oldh); | |
| 105 end_unwind_protect | |
| 106 | |
| 107 if (nargout > 0) | |
| 108 retval = hlist; | |
| 109 endif | |
| 110 | |
| 111 endfunction | |
| 112 | |
| 113 %!demo | |
| 114 %! a = toeplitz([1;randn(9,1)],[1,randn(1,9)]); | |
| 115 %! compass (eig (a)) |