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1 ## Copyright (C) 2007 David Bateman |
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2 ## |
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3 ## This file is part of Octave. |
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4 ## |
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5 ## Octave is free software; you can redistribute it and/or modify it |
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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 (at |
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8 ## your option) any later version. |
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9 ## |
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10 ## Octave is distributed in the hope that it will be useful, but |
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 ## General Public License for more details. |
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14 ## |
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15 ## You should have received a copy of the GNU General Public License |
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16 ## along with Octave; see the file COPYING. If not, see |
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17 ## <http://www.gnu.org/licenses/>. |
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18 |
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19 ## -*- texinfo -*- |
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20 ## @deftypefn {Function File} {} rose (@var{th}, @var{r}) |
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21 ## @deftypefnx {Function File} {} rose (@var{h}, @dots{}) |
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22 ## @deftypefnx {Function File} {@var{h} =} compass (@dots{}) |
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23 ## @deftypefnx {Function File} {[@var{r}, @var{th}] =} compass (@dots{}) |
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24 ## |
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25 ## Plot an angular histogram. With one vector argument @var{th}, plots the |
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26 ## histogram with 20 angular bins. If @var{th} is a matrix, then each column |
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27 ## of @var{th} produces a separate histogram. |
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28 ## |
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29 ## If @var{r} is given and is a scalar, then the histogram is produced with |
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30 ## @var{r} bins. If @var{r} is a vector, then the center of each bin are |
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31 ## defined by the values of @var{r}. |
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32 ## |
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33 ## The optional return value @var{h} provides a list of handles to the |
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34 ## the parts of the vector field (body, arrow and marker). |
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35 ## |
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36 ## If two output arguments are requested, then rather than plotting the |
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37 ## histogram, the polar vectors necessary to plot the histogram are |
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38 ## returned. |
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39 # |
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40 ## @example |
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41 ## [r, t] = rose ([2*randn(1e5,1), pi + 2 * randn(1e5,1)]); |
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42 ## polar (r, t); |
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43 ## @end example |
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44 ## |
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45 ## |
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46 ## @seealso{plot, compass, polar, hist} |
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47 ## @end deftypefn |
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48 |
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49 function [thout, rout] = rose (varargin) |
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50 |
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51 [h, varargin, nargin] = __plt_get_axis_arg__ ((nargout > 1), "rose", |
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52 varargin{:}); |
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53 |
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54 if (nargin < 1) |
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55 print_usage (); |
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56 endif |
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57 |
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58 ## Force theta to [0,2*pi] range |
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59 th = varargin {1}; |
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60 th = atan2 (sin (th), cos (th)) + pi; |
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61 |
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62 if (nargin > 1) |
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63 x = varargin {2}; |
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64 if (isscalar (x)) |
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65 x = [0.5/x : 1/x : 1] * 2 * pi; |
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66 else |
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67 ## Force theta to [0,2*pi] range |
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68 x = atan2 (sin (x), cos (x)) + pi; |
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69 endif |
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70 else |
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71 x = [1/40 : 1/20 : 1] * 2 * pi; |
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72 endif |
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73 |
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74 [nn, xx] = hist (th, x); |
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75 xx = xx(:).'; |
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76 if (isvector (nn)) |
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77 nn = nn (:); |
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78 endif |
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79 x1 = xx(1:end-1) + diff (xx, 1) / 2; |
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80 x1 = [x1 ; x1; x1; x1](:); |
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81 th = [0; 0; x1; 2*pi ; 2*pi]; |
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82 r = zeros (4 * size (nn, 1), size (nn, 2)); |
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83 r(2:4:end, :) = nn; |
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84 r(3:4:end, :) = nn; |
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85 |
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86 if (nargout < 2) |
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87 oldh = gca (); |
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88 unwind_protect |
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89 axes (h); |
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90 newplot (); |
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91 hlist = polar (h, th, r); |
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92 unwind_protect_cleanup |
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93 axes (oldh); |
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94 end_unwind_protect |
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95 |
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96 if (nargout > 0) |
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97 thout = hlist; |
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98 endif |
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99 else |
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100 thout = th; |
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101 rout = r; |
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102 endif |
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103 |
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104 endfunction |
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105 |
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106 %!demo |
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107 %! rose ([2*randn(1e5,1), pi + 2 * randn(1e5,1)]) |
