Mercurial > hg > octave-lyh
annotate scripts/plot/cylinder.m @ 14092:22c50cbad2ce stable
Add clf() to all plot demos.
* axis.m, compass.m, contour3.m, contourf.m, cylinder.m, ellipsoid.m,
errorbar.m, ezcontour.m, ezcontourf.m, ezmesh.m, ezmeshc.m, ezplot.m,
ezplot3.m, ezpolar.m, ezsurf.m, ezsurfc.m, feather.m, fplot.m,
loglogerr.m, pcolor.m, pie.m, pie3.m, plot3.m, plotmatrix.m,
quiver.m, quiver3.m, refreshdata.m, ribbon.m, rose.m, scatter3.m,
semilogx.m, semilogxerr.m, semilogy.m, semilogyerr.m, shading.m,
sombrero.m, stairs.m, stem.m, stem3.m, surf.m, surfc.m, surfl.m,
surfnorm.m, trimesh.m, triplot.m, trisurf.m, uimenu.m:
Add clf() to the beginning of each demo to ensure pre-existing graphics
objects don't interfere with the demo.
| author | Ben Abbott <bpabbott@mac.com> |
|---|---|
| date | Wed, 21 Dec 2011 21:19:48 -0500 |
| parents | d0b799dafede |
| children | 72c96de7a403 |
| rev | line source |
|---|---|
| 11523 | 1 ## Copyright (C) 2007-2011 Michael Goffioul and Kai Habel |
| 7181 | 2 ## |
| 3 ## This file is part of Octave. | |
| 4 ## | |
| 5 ## Octave is free software; you can redistribute it and/or modify it | |
| 6 ## under the terms of the GNU General Public License as published by | |
| 7 ## the Free Software Foundation; either version 3 of the License, or (at | |
| 8 ## your option) any later version. | |
| 9 ## | |
| 10 ## Octave is distributed in the hope that it will be useful, but | |
| 11 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 ## General Public License for more details. | |
| 14 ## | |
| 15 ## You should have received a copy of the GNU General Public License | |
| 16 ## along with Octave; see the file COPYING. If not, see | |
| 17 ## <http://www.gnu.org/licenses/>. | |
| 18 | |
| 19 ## -*- texinfo -*- | |
|
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20 ## @deftypefn {Function File} {} cylinder |
| 7181 | 21 ## @deftypefnx {Function File} {} cylinder (@var{r}) |
| 22 ## @deftypefnx {Function File} {} cylinder (@var{r}, @var{n}) | |
| 23 ## @deftypefnx {Function File} {[@var{x}, @var{y}, @var{z}] =} cylinder (@dots{}) | |
| 24 ## @deftypefnx {Function File} {} cylinder (@var{ax}, @dots{}) | |
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25 ## Generate three matrices in @code{meshgrid} format, such that |
| 7181 | 26 ## @code{surf (@var{x}, @var{y}, @var{z})} generates a unit cylinder. |
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27 ## The matrices are of size @code{@var{n}+1}-by-@code{@var{n}+1}. |
| 7181 | 28 ## @var{r} is a vector containing the radius along the z-axis. |
| 29 ## If @var{n} or @var{r} are omitted then default values of 20 or [1 1] | |
| 30 ## are assumed. | |
| 31 ## | |
| 32 ## Called with no return arguments, @code{cylinder} calls directly | |
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33 ## @code{surf (@var{x}, @var{y}, @var{z})}. If an axes handle @var{ax} |
| 7182 | 34 ## is passed as the first argument, the surface is plotted to this set |
| 35 ## of axes. | |
| 7181 | 36 ## |
| 37 ## Examples: | |
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38 ## |
| 7181 | 39 ## @example |
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40 ## @group |
| 7182 | 41 ## [x, y, z] = cylinder (10:-1:0,50); |
| 42 ## surf (x, y, z); | |
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43 ## title ("a cone") |
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44 ## @end group |
| 7181 | 45 ## @end example |
| 46 ## @seealso{sphere} | |
| 47 ## @end deftypefn | |
| 48 | |
| 7182 | 49 function [xx, yy, zz] = cylinder (varargin) |
| 7181 | 50 |
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51 [ax, args, nargs] = __plt_get_axis_arg__ ((nargout > 0), "cylinder", |
| 10549 | 52 varargin{:}); |
| 7181 | 53 |
| 54 if (nargs == 0) | |
| 55 n = 20; | |
| 7182 | 56 r = [1, 1]; |
| 7181 | 57 elseif (nargs == 1) |
| 58 n = 20; | |
| 59 r = args{1}; | |
| 60 elseif (nargs == 2) | |
| 61 r = args{1}; | |
| 62 n = args{2}; | |
| 63 else | |
| 7182 | 64 print_usage (); |
| 7181 | 65 endif |
| 66 | |
| 7182 | 67 if (length (r) < 2) |
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68 error ("cylinder: length(R) must be larger than 2"); |
| 7181 | 69 endif |
| 70 | |
| 7182 | 71 phi = linspace (0, 2*pi, n+1); |
| 7181 | 72 idx = 1:length(r); |
| 73 [phi, idx] = meshgrid(phi, idx); | |
| 74 z = (idx - 1) / (length(r) - 1); | |
| 75 r = r(idx); | |
| 7182 | 76 [x, y] = pol2cart (phi, r); |
| 7181 | 77 |
| 78 if (nargout > 0) | |
| 79 xx = x; | |
| 80 yy = y; | |
| 81 zz = z; | |
| 82 else | |
| 7215 | 83 surf (ax, x, y, z); |
| 7181 | 84 endif |
| 85 | |
| 86 endfunction | |
| 7245 | 87 |
| 88 %!demo | |
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89 %! clf |
| 7245 | 90 %! [x, y, z] = cylinder (10:-1:0,50); |
| 91 %! surf (x, y, z); | |
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12129
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cylinder.m: Remove console output from demo.
Ben Abbott <bpabbott@mac.com>
parents:
11589
diff
changeset
|
92 %! title ("a cone") |