Mercurial > octave-antonio
annotate scripts/general/polyarea.m @ 20158:7503499a252b stable
doc: Update docstrings to have one sentence summary as first line.
Update scripts in audio, elfun, general, geometry, and image directories.
* scripts/audio/@audioplayer/__get_properties__.m,
scripts/audio/@audioplayer/audioplayer.m, scripts/audio/@audioplayer/get.m,
scripts/audio/@audioplayer/isplaying.m, scripts/audio/@audioplayer/play.m,
scripts/audio/@audioplayer/playblocking.m, scripts/audio/@audioplayer/set.m,
scripts/audio/@audioplayer/subsasgn.m, scripts/audio/@audioplayer/subsref.m,
scripts/audio/@audiorecorder/audiorecorder.m,
scripts/audio/@audiorecorder/get.m,
scripts/audio/@audiorecorder/getaudiodata.m,
scripts/audio/@audiorecorder/getplayer.m,
scripts/audio/@audiorecorder/isrecording.m,
scripts/audio/@audiorecorder/play.m, scripts/audio/@audiorecorder/record.m,
scripts/audio/@audiorecorder/recordblocking.m,
scripts/audio/@audiorecorder/set.m, scripts/audio/@audiorecorder/stop.m,
scripts/audio/@audiorecorder/subsasgn.m,
scripts/audio/@audiorecorder/subsref.m, scripts/audio/lin2mu.m,
scripts/audio/mu2lin.m, scripts/audio/record.m, scripts/audio/sound.m,
scripts/audio/soundsc.m, scripts/audio/wavread.m, scripts/audio/wavwrite.m,
scripts/elfun/cosd.m, scripts/elfun/sind.m, scripts/elfun/tand.m,
scripts/general/accumarray.m, scripts/general/accumdim.m,
scripts/general/bitcmp.m, scripts/general/bitget.m, scripts/general/bitset.m,
scripts/general/blkdiag.m, scripts/general/cart2pol.m,
scripts/general/cart2sph.m, scripts/general/cell2mat.m,
scripts/general/celldisp.m, scripts/general/chop.m,
scripts/general/circshift.m, scripts/general/common_size.m,
scripts/general/cplxpair.m, scripts/general/cumtrapz.m,
scripts/general/dblquad.m, scripts/general/deal.m, scripts/general/del2.m,
scripts/general/display.m, scripts/general/divergence.m,
scripts/general/fieldnames.m, scripts/general/flip.m,
scripts/general/flipdim.m, scripts/general/fliplr.m, scripts/general/flipud.m,
scripts/general/gradient.m, scripts/general/interp3.m,
scripts/general/interpft.m, scripts/general/interpn.m,
scripts/general/loadobj.m, scripts/general/logspace.m,
scripts/general/methods.m, scripts/general/nargchk.m,
scripts/general/narginchk.m, scripts/general/nargoutchk.m,
scripts/general/nextpow2.m, scripts/general/nthargout.m,
scripts/general/num2str.m, scripts/general/pol2cart.m,
scripts/general/polyarea.m, scripts/general/postpad.m,
scripts/general/prepad.m, scripts/general/profile.m, scripts/general/quadgk.m,
scripts/general/quadl.m, scripts/general/quadv.m, scripts/general/randi.m,
scripts/general/rat.m, scripts/general/repmat.m, scripts/general/rot90.m,
scripts/general/rotdim.m, scripts/general/saveobj.m, scripts/general/shift.m,
scripts/general/shiftdim.m, scripts/general/sortrows.m,
scripts/general/sph2cart.m, scripts/general/structfun.m,
scripts/general/subsindex.m, scripts/general/trapz.m,
scripts/general/triplequad.m, scripts/geometry/delaunayn.m,
scripts/geometry/dsearch.m, scripts/geometry/dsearchn.m,
scripts/geometry/griddata.m, scripts/geometry/griddata3.m,
scripts/geometry/griddatan.m, scripts/geometry/inpolygon.m,
scripts/geometry/rectint.m, scripts/geometry/tsearchn.m,
scripts/geometry/voronoi.m, scripts/geometry/voronoin.m,
scripts/help/__unimplemented__.m, scripts/help/doc.m,
scripts/help/doc_cache_create.m, scripts/help/get_first_help_sentence.m,
scripts/help/help.m, scripts/help/lookfor.m, scripts/help/print_usage.m,
scripts/help/type.m, scripts/help/which.m, scripts/image/autumn.m,
scripts/image/bone.m, scripts/image/brighten.m, scripts/image/cmpermute.m,
scripts/image/colorcube.m, scripts/image/contrast.m, scripts/image/cool.m,
scripts/image/copper.m, scripts/image/cubehelix.m, scripts/image/flag.m,
scripts/image/gmap40.m, scripts/image/gray.m, scripts/image/gray2ind.m,
scripts/image/hot.m, scripts/image/hsv.m, scripts/image/image.m,
scripts/image/imagesc.m, scripts/image/imfinfo.m, scripts/image/imformats.m,
scripts/image/imread.m, scripts/image/imshow.m, scripts/image/imwrite.m,
scripts/image/iscolormap.m, scripts/image/jet.m, scripts/image/lines.m,
scripts/image/ntsc2rgb.m, scripts/image/ocean.m, scripts/image/pink.m,
scripts/image/prism.m, scripts/image/rainbow.m, scripts/image/rgb2ntsc.m,
scripts/image/spinmap.m, scripts/image/spring.m, scripts/image/summer.m,
scripts/image/white.m, scripts/image/winter.m:
Update docstrings to have one sentence summary as first line.
Re-structure to have line lengths <= 80 chars.
| author | Rik <rik@octave.org> |
|---|---|
| date | Sun, 03 May 2015 09:36:20 -0700 |
| parents | 4197fc428c7d |
| children |
| rev | line source |
|---|---|
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1 ## Copyright (C) 1999-2015 David M. Doolin |
| 5837 | 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 | |
| 7016 | 7 ## the Free Software Foundation; either version 3 of the License, or (at |
| 8 ## your option) any later version. | |
| 5837 | 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 | |
| 7016 | 16 ## along with Octave; see the file COPYING. If not, see |
| 17 ## <http://www.gnu.org/licenses/>. | |
| 5837 | 18 |
| 19 ## -*- texinfo -*- | |
|
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20 ## @deftypefn {Function File} {} polyarea (@var{x}, @var{y}) |
| 5837 | 21 ## @deftypefnx {Function File} {} polyarea (@var{x}, @var{y}, @var{dim}) |
| 22 ## | |
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23 ## Determine area of a polygon by triangle method. |
| 5837 | 24 ## |
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25 ## The variables @var{x} and @var{y} define the vertex pairs, and must |
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26 ## therefore have the same shape. They can be either vectors or arrays. If |
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27 ## they are arrays then the columns of @var{x} and @var{y} are treated |
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28 ## separately and an area returned for each. |
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29 ## |
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30 ## If the optional @var{dim} argument is given, then @code{polyarea} works |
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31 ## along this dimension of the arrays @var{x} and @var{y}. |
| 5837 | 32 ## |
| 33 ## @end deftypefn | |
| 34 | |
| 35 ## todo: Add moments for centroid, etc. | |
| 36 ## | |
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37 ## bugs and limitations: |
| 5837 | 38 ## Probably ought to be an optional check to make sure that |
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39 ## traversing the vertices doesn't make any sides cross |
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40 ## (Is simple closed curve the technical definition of this?). |
| 5837 | 41 |
| 42 ## Author: David M. Doolin <doolin@ce.berkeley.edu> | |
| 5838 | 43 ## Date: 1999-04-14 |
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44 ## Modified-by: |
| 5837 | 45 ## 2000-01-15 Paul Kienzle <pkienzle@kienzle.powernet.co.uk> |
| 46 ## * use matlab compatible interface | |
| 47 ## * return absolute value of area so traversal order doesn't matter | |
| 48 ## 2005-10-13 Torsten Finke | |
| 49 ## * optimization saving half the sums and multiplies | |
| 50 | |
| 51 function a = polyarea (x, y, dim) | |
| 52 if (nargin != 2 && nargin != 3) | |
| 53 print_usage (); | |
| 6157 | 54 elseif (size_equal (x, y)) |
| 5837 | 55 if (nargin == 2) |
| 56 a = abs (sum (x .* (shift (y, -1) - shift (y, 1)))) / 2; | |
| 57 else | |
| 58 a = abs (sum (x .* (shift (y, -1, dim) - shift (y, 1, dim)), dim)) / 2; | |
| 59 endif | |
| 5838 | 60 else |
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61 error ("polyarea: X and Y must have the same shape"); |
| 5837 | 62 endif |
| 63 endfunction | |
| 64 | |
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65 |
| 5837 | 66 %!shared x, y |
| 67 %! x = [1;1;3;3;1]; | |
| 68 %! y = [1;3;3;1;1]; | |
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69 %!assert (polyarea (x,y), 4, eps) |
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70 %!assert (polyarea ([x,x],[y,y]), [4,4], eps) |
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71 %!assert (polyarea ([x,x],[y,y],1), [4,4], eps) |
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72 %!assert (polyarea ([x,x]',[y,y]',2), [4;4], eps) |
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73 |