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Added tag ss-3-7-7 for changeset cc13924a4266
author John W. Eaton <jwe@octave.org>
date Mon, 23 Sep 2013 13:31:11 -0400
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1 ## Copyright (C) 2008-2012 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{f2v})
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22 ## @deftypefnx {Function File} {} ezplot (@var{fx}, @var{fy})
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23 ## @deftypefnx {Function File} {} ezplot (@dots{}, @var{dom})
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24 ## @deftypefnx {Function File} {} ezplot (@dots{}, @var{n})
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25 ## @deftypefnx {Function File} {} ezplot (@var{hax}, @dots{})
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26 ## @deftypefnx {Function File} {@var{h} =} ezplot (@dots{})
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27 ##
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28 ## Plot the 2-D curve defined by the function @var{f}.
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29 ##
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30 ## The function @var{f} may be a string, inline function, or function handle
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31 ## and can have either one or two variables. If @var{f} has one variable, then
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32 ## the function is plotted over the domain @code{-2*pi < @var{x} < 2*pi}
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33 ## with 500 points.
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34 ##
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35 ## If @var{f2v} is a function of two variables then the implicit function
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36 ## @code{@var{f}(@var{x},@var{y}) = 0} is calculated over the meshed domain
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37 ## @code{-2*pi <= @var{x} | @var{y} <= 2*pi} with 60 points in each dimension.
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38 ##
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39 ## For example:
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40 ##
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41 ## @example
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42 ## ezplot (@@(@var{x}, @var{y}) @var{x}.^2 - @var{y}.^2 - 1)
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43 ## @end example
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44 ##
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45 ## If two functions are passed as inputs then the parametric function
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46 ##
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47 ## @example
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48 ## @group
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49 ## @var{x} = @var{fx} (@var{t})
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50 ## @var{y} = @var{fy} (@var{t})
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51 ## @end group
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52 ## @end example
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53 ##
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54 ## @noindent
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55 ## is plotted over the domain @code{-2*pi <= @var{t} <= 2*pi} with 500 points.
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56 ##
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57 ## If @var{dom} is a two element vector, it represents the minimum and maximum
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58 ## values of both @var{x} and @var{y}, or @var{t} for a parametric plot. If
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59 ## @var{dom} is a four element vector, then the minimum and maximum values are
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60 ## @code{[xmin xmax ymin ymax]}.
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61 ##
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62 ## @var{n} is a scalar defining the number of points to use in plotting
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63 ## the function.
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64 ##
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65 ## If the first argument @var{hax} is an axes handle, then plot into this axis,
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66 ## rather than the current axes returned by @code{gca}.
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67 ##
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68 ## The optional return value @var{h} is a vector of graphics handles to
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69 ## the created line objects.
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70 ##
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71 ## @seealso{plot, ezplot3, ezpolar, ezcontour, ezcontourf, ezmesh, ezmeshc, ezsurf, ezsurfc}
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72 ## @end deftypefn
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73
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74 function h = ezplot (varargin)
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75
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76 [htmp, needusage] = __ezplot__ ("plot", varargin{:});
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77
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78 if (needusage)
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79 print_usage ();
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80 endif
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81
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82 if (nargout > 0)
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83 h = htmp;
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84 endif
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85
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86 endfunction
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87
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88
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89 %!demo
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90 %! %% sinc function using function handle
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91 %! f = @(x) sin (pi*x) ./ (pi*x);
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92 %! ezplot (f);
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93
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94 %!demo
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95 %! %% example of a function string and explicit limits
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96 %! clf;
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97 %! ezplot ('1/x', [-2 2]);
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98
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99 %!demo
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100 %! %% parameterized function example over -2*pi <= t <= +2*pi
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101 %! clf;
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102 %! ezplot (@cos, @sin);
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103
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104 %!demo
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105 %! %% implicit function of 2 variables
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106 %! clf;
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107 %! ezplot (inline ('x^2 - y^2 - 1'));
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108