Mercurial > octave
view scripts/plot/draw/contour.m @ 32062:ada96a467a28
quiver: Improve plotting with non-float numeric inputs (bug #59695)
* scripts/plot/draw/private/__quiver__.m: Change firstnonnumeric check to look
for char instead of numeric to allow for logical inputs. Recast all inputs
up to firstnonnumeric as doubles. Check if firstnonnumeric element is 'off'
and if so set scale factor to 0 and increment firstnonnumeric.
* scripts/plot/draw/quiver.m: Update docstring to include scaling factor
option 'off'. Add BIST for int and logical input types.
* scripts/plot/draw/quiver3.m: Update docstring to include scaling factor
option 'off'. Add BISTs for too-few inputs.
* etc/NEWS.9.md: Appended details of changes to quiver note under General
Improvements and noted it also applies to quiver3.
author | Nicholas R. Jankowski <jankowski.nicholas@gmail.com> |
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date | Wed, 26 Apr 2023 17:18:50 -0400 |
parents | 597f3ee61a48 |
children | 2e484f9f1f18 |
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######################################################################## ## ## Copyright (C) 1993-2023 The Octave Project Developers ## ## See the file COPYRIGHT.md in the top-level directory of this ## distribution or <https://octave.org/copyright/>. ## ## This file is part of Octave. ## ## Octave is free software: you can redistribute it and/or modify it ## under the terms of the GNU General Public License as published by ## the Free Software Foundation, either version 3 of the License, or ## (at your option) any later version. ## ## Octave is distributed in the hope that it will be useful, but ## WITHOUT ANY WARRANTY; without even the implied warranty of ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ## GNU General Public License for more details. ## ## You should have received a copy of the GNU General Public License ## along with Octave; see the file COPYING. If not, see ## <https://www.gnu.org/licenses/>. ## ######################################################################## ## -*- texinfo -*- ## @deftypefn {} {} contour (@var{z}) ## @deftypefnx {} {} contour (@var{z}, @var{vn}) ## @deftypefnx {} {} contour (@var{x}, @var{y}, @var{z}) ## @deftypefnx {} {} contour (@var{x}, @var{y}, @var{z}, @var{vn}) ## @deftypefnx {} {} contour (@dots{}, @var{style}) ## @deftypefnx {} {} contour (@var{hax}, @dots{}) ## @deftypefnx {} {[@var{c}, @var{h}] =} contour (@dots{}) ## Create a 2-D contour plot. ## ## Plot level curves (contour lines) of the matrix @var{z}, using the ## contour matrix @var{c} computed by @code{contourc} from the same ## arguments; see the latter for their interpretation. ## ## The appearance of contour lines can be defined with a line style @var{style} ## in the same manner as @code{plot}. Only line style and color are used; ## Any markers defined by @var{style} are ignored. ## ## If the first argument @var{hax} is an axes handle, then plot into this axes, ## rather than the current axes returned by @code{gca}. ## ## The optional output @var{c} contains the contour levels in @code{contourc} ## format. ## ## The optional return value @var{h} is a graphics handle to the hggroup ## comprising the contour lines. ## ## Example: ## ## @example ## @group ## x = 0:3; ## y = 0:2; ## z = y' * x; ## contour (x, y, z, 2:3) ## @end group ## @end example ## ## @seealso{ezcontour, contourc, contourf, contour3, clabel, meshc, surfc, ## caxis, colormap, plot} ## ## @end deftypefn function [c, h] = contour (varargin) [hax, varargin] = __plt_get_axis_arg__ ("contour", varargin{:}); oldfig = []; if (! isempty (hax)) oldfig = get (0, "currentfigure"); endif unwind_protect hax = newplot (hax); [ctmp, htmp] = __contour__ (hax, "none", varargin{:}); if (! ishold ()) set (hax, "box", "on"); endif unwind_protect_cleanup if (! isempty (oldfig)) set (0, "currentfigure", oldfig); endif end_unwind_protect if (nargout > 0) c = ctmp; h = htmp; endif endfunction %!demo %! clf; %! colormap ("default"); %! [x, y, z] = peaks (); %! contour (x, y, z); %! title ({"contour() plot (isolines of constant Z)"; "Z = peaks()"}); %!demo %! clf; %! colormap ("default"); %! [theta, r] = meshgrid (linspace (0,2*pi,64), linspace (0,1,64)); %! [X, Y] = pol2cart (theta, r); %! Z = sin (2*theta) .* (1-r); %! contour (X, Y, abs (Z), 10); %! title ({"contour() plot"; "polar fcn: Z = sin (2*theta) * (1-r)"}); %!demo %! clf; %! colormap ("default"); %! z = peaks (); %! contour (z, [0 0]); %! title ({"contour() plot with single isoline at Z == 0"; "Z = peaks()"}); %!test %! hf = figure ("visible", "off"); %! clf (hf); %! unwind_protect %! [x, y, z] = peaks (); %! [c, h] = contour (x, y, z); %! levellist = -6:6; %! set (h, "levellist", levellist); %! assert (get (h, "levellist"), levellist); %! assert (get (h, "levellistmode"), "manual"); %! unwind_protect_cleanup %! close (hf); %! end_unwind_protect %!test %! hf = figure ("visible", "off"); %! clf (hf); %! unwind_protect %! [x, y, z] = peaks (); %! [c, h] = contour (x, y, z); %! levelstep = 3; %! set (h, "levelstep", levelstep); %! assert (get (h, "levelstep"), levelstep); %! assert (get (h, "levelstepmode"), "manual"); %! assert (get (h, "levellist"), -6:levelstep:6); %! assert (get (h, "levellistmode"), "auto"); %! unwind_protect_cleanup %! close (hf); %! end_unwind_protect