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1 ## Copyright (C) 2008 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} {} ezplot (@var{f}) |
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21 ## @deftypefnx {Function File} {} ezplot (@var{fx}, @var{fy}) |
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22 ## @deftypefnx {Function File} {} ezplot (@dots{}, @var{dom}) |
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23 ## @deftypefnx {Function File} {} ezplot (@dots{}, @var{n}) |
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24 ## @deftypefnx {Function File} {} ezplot (@var{h}, @dots{}) |
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25 ## @deftypefnx {Function File} {@var{h} =} ezplot (@dots{}) |
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26 ## |
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27 ## Plots in two-dimensions the curve defined by @var{f}. The function |
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28 ## @var{f} may be a string, inline function or function handle and can |
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29 ## have either one or two variables. If @var{f} has one variable, then |
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30 ## the function is plotted over the domain @code{-2*pi < @var{x} < 2*pi} |
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31 ## with 500 points. |
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32 ## |
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33 ## If @var{f} has two variables then @code{@var{f}(@var{x},@var{y}) = 0} |
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34 ## is calculated over the meshed domain @code{-2*pi < @var{x} | @var{y} |
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35 ## < 2*pi} with 60 by 60 in the mesh. For example |
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36 ## |
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37 ## @example |
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38 ## ezplot (@@(@var{x}, @var{y}) @var{x} .^ 2 - @var{y} .^ 2 - 1) |
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39 ## @end example |
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40 ## |
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41 ## If two functions are passed as strings, inline functions or function |
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42 ## handles, then the parametric function |
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43 ## |
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44 ## @example |
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45 ## @group |
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46 ## @var{x} = @var{fx} (@var{t}) |
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47 ## @var{y} = @var{fy} (@var{t}) |
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48 ## @end group |
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49 ## @end example |
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50 ## |
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51 ## is plotted over the domain @code{-2*pi < @var{t} < 2*pi} with 500 |
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52 ## points. |
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53 ## |
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54 ## If @var{dom} is a two element vector, it represents the minimum and maximum |
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55 ## value of @var{x}, @var{y} and @var{t}. If it is a four element |
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56 ## vector, then the minimum and maximum values of @var{x} and @var{t} |
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57 ## are determined by the first two elements and the minimum and maximum |
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58 ## of @var{y} by the second pair of elements. |
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59 ## |
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60 ## @var{n} is a scalar defining the number of points to use in plotting |
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61 ## the function. |
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62 ## |
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63 ## The optional return value @var{h} provides a list of handles to the |
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64 ## the line objects plotted. |
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65 ## |
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66 ## @seealso{plot, ezplot3} |
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67 ## @end deftypefn |
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68 |
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69 function retval = ezplot (varargin) |
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70 |
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71 [h, needusage] = __ezplot__ ("plot", varargin{:}); |
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72 |
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73 if (needusage) |
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74 print_usage (); |
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75 endif |
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76 |
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77 if (nargout > 0) |
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78 retval = h; |
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79 endif |
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80 endfunction |
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81 |
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82 %!demo |
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83 %! ezplot (@cos, @sin) |
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84 |
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85 %!demo |
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86 %! ezplot ("1/x") |
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87 |
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88 %!demo |
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89 %! ezplot (inline("x^2 - y^2 = 1")) |
