1######################################################################## 2## 3## Copyright (C) 2007-2021 The Octave Project Developers 4## 5## See the file COPYRIGHT.md in the top-level directory of this 6## distribution or <https://octave.org/copyright/>. 7## 8## This file is part of Octave. 9## 10## Octave is free software: you can redistribute it and/or modify it 11## under the terms of the GNU General Public License as published by 12## the Free Software Foundation, either version 3 of the License, or 13## (at your option) any later version. 14## 15## Octave is distributed in the hope that it will be useful, but 16## WITHOUT ANY WARRANTY; without even the implied warranty of 17## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18## GNU General Public License for more details. 19## 20## You should have received a copy of the GNU General Public License 21## along with Octave; see the file COPYING. If not, see 22## <https://www.gnu.org/licenses/>. 23## 24######################################################################## 25 26## -*- texinfo -*- 27## @deftypefn {} {} ezsurfc (@var{f}) 28## @deftypefnx {} {} ezsurfc (@var{fx}, @var{fy}, @var{fz}) 29## @deftypefnx {} {} ezsurfc (@dots{}, @var{dom}) 30## @deftypefnx {} {} ezsurfc (@dots{}, @var{n}) 31## @deftypefnx {} {} ezsurfc (@dots{}, "circ") 32## @deftypefnx {} {} ezsurfc (@var{hax}, @dots{}) 33## @deftypefnx {} {@var{h} =} ezsurfc (@dots{}) 34## 35## Plot the surface and contour lines defined by a function. 36## 37## @var{f} is a string, inline function, or function handle with two arguments 38## defining the function. By default the plot is over the meshed domain 39## @code{-2*pi <= @var{x} | @var{y} <= 2*pi} with 60 points in each dimension. 40## 41## If three functions are passed, then plot the parametrically defined 42## function @code{[@var{fx}(@var{s}, @var{t}), @var{fy}(@var{s}, @var{t}), 43## @var{fz}(@var{s}, @var{t})]}. 44## 45## If @var{dom} is a two element vector, it represents the minimum and maximum 46## values of both @var{x} and @var{y}. If @var{dom} is a four element vector, 47## then the minimum and maximum values are @code{[xmin xmax ymin ymax]}. 48## 49## @var{n} is a scalar defining the number of points to use in each dimension. 50## 51## If the argument @qcode{"circ"} is given, then the function is plotted over 52## a disk centered on the middle of the domain @var{dom}. 53## 54## If the first argument @var{hax} is an axes handle, then plot into this axes, 55## rather than the current axes returned by @code{gca}. 56## 57## The optional return value @var{h} is a 2-element vector with a graphics 58## handle for the created surface plot and a second handle for the created 59## contour plot. 60## 61## Example: 62## 63## @example 64## @group 65## f = @@(x,y) sqrt (abs (x .* y)) ./ (1 + x.^2 + y.^2); 66## ezsurfc (f, [-3, 3]); 67## @end group 68## @end example 69## 70## @seealso{surfc, ezsurf, ezplot, ezmesh, ezmeshc, shading} 71## @end deftypefn 72 73function h = ezsurfc (varargin) 74 75 [htmp, needusage] = __ezplot__ ("surfc", varargin{:}); 76 77 if (needusage) 78 print_usage (); 79 endif 80 81 if (nargout > 0) 82 h = htmp; 83 endif 84 85endfunction 86 87 88%!demo 89%! clf; 90%! colormap ("default"); 91%! f = @(x,y) sqrt (abs (x .* y)) ./ (1 + x.^2 + y.^2); 92%! ezsurfc (f, [-3, 3]); 93