Mercurial > hg > octave-nkf
annotate scripts/general/divergence.m @ 14846:460a3c6d8bf1
maint: Use Octave coding convention for cuddled parenthis in function calls with empty argument lists.
Example: func() => func ()
* dynamic.txi, func.txi, oop.txi, var.txi, embedded.cc, fortdemo.cc,
funcdemo.cc, paramdemo.cc, stringdemo.cc, unwinddemo.cc, Array.cc, Array.h,
CColVector.cc, CDiagMatrix.h, CMatrix.cc, CNDArray.cc, CRowVector.cc,
CSparse.cc, CmplxGEPBAL.cc, EIG.cc, MSparse.cc, MatrixType.cc,
Sparse-op-defs.h, Sparse-perm-op-defs.h, Sparse.cc, Sparse.h,
SparseCmplxCHOL.cc, SparseCmplxCHOL.h, SparseCmplxLU.cc, SparseCmplxQR.cc,
SparseCmplxQR.h, SparseQR.cc, SparseQR.h, SparsedbleCHOL.cc, SparsedbleCHOL.h,
SparsedbleLU.cc, SparsedbleLU.h, base-lu.cc, cmd-hist.cc, dColVector.cc,
dDiagMatrix.h, dMatrix.cc, dNDArray.cc, dRowVector.cc, dSparse.cc, dbleCHOL.cc,
dbleGEPBAL.cc, dim-vector.cc, eigs-base.cc, f2c-main.c, fCColVector.cc,
fCDiagMatrix.h, fCMatrix.cc, fCNDArray.cc, fCRowVector.cc, fCmplxGEPBAL.cc,
fColVector.cc, fDiagMatrix.h, fEIG.cc, fMatrix.cc, fNDArray.cc, fRowVector.cc,
file-ops.cc, file-stat.cc, floatCHOL.cc, floatGEPBAL.cc, idx-vector.h,
lo-specfun.cc, lo-sysdep.cc, mx-inlines.cc, oct-binmap.h, oct-convn.cc,
oct-md5.cc, oct-mem.h, oct-rand.cc, oct-syscalls.cc, randgamma.c, randmtzig.c,
sparse-base-chol.cc, sparse-base-chol.h, sparse-base-lu.cc, sparse-dmsolve.cc,
tempname.c, curl.m, divergence.m, randi.m, dlmwrite.m, edit.m, getappdata.m,
what.m, getarchdir.m, install.m, installed_packages.m, repackage.m,
unload_packages.m, colorbar.m, figure.m, isosurface.m, legend.m, loglog.m,
plot.m, plot3.m, plotyy.m, polar.m, __errplot__.m, __ghostscript__.m,
__marching_cube__.m, __plt__.m, __scatter__.m, semilogx.m, semilogy.m,
trimesh.m, trisurf.m, demo.m, test.m, datetick.m, __delaunayn__.cc,
__dsearchn__.cc, __fltk_uigetfile__.cc, __glpk__.cc, __init_fltk__.cc,
__lin_interpn__.cc, __magick_read__.cc, __pchip_deriv__.cc, balance.cc,
bsxfun.cc, ccolamd.cc, cellfun.cc, chol.cc, daspk.cc, dasrt.cc, dassl.cc,
dmperm.cc, eig.cc, eigs.cc, fftw.cc, filter.cc, find.cc, kron.cc, lookup.cc,
lsode.cc, matrix_type.cc, md5sum.cc, mgorth.cc, qr.cc, quad.cc, rand.cc,
regexp.cc, symbfact.cc, tril.cc, urlwrite.cc, op-bm-bm.cc, op-cdm-cdm.cc,
op-cell.cc, op-chm.cc, op-cm-cm.cc, op-cm-scm.cc, op-cm-sm.cc, op-cs-scm.cc,
op-cs-sm.cc, op-dm-dm.cc, op-dm-scm.cc, op-dm-sm.cc, op-fcdm-fcdm.cc,
op-fcm-fcm.cc, op-fdm-fdm.cc, op-fm-fm.cc, op-int.h, op-m-m.cc, op-m-scm.cc,
op-m-sm.cc, op-pm-pm.cc, op-pm-scm.cc, op-pm-sm.cc, op-range.cc, op-s-scm.cc,
op-s-sm.cc, op-sbm-sbm.cc, op-scm-cm.cc, op-scm-cs.cc, op-scm-m.cc,
op-scm-s.cc, op-scm-scm.cc, op-scm-sm.cc, op-sm-cm.cc, op-sm-cs.cc, op-sm-m.cc,
op-sm-s.cc, op-sm-scm.cc, op-sm-sm.cc, op-str-str.cc, op-struct.cc, bitfcns.cc,
data.cc, debug.cc, dynamic-ld.cc, error.cc, gl-render.cc, graphics.cc,
graphics.in.h, load-path.cc, ls-hdf5.cc, ls-mat5.cc, ls-mat5.h,
ls-oct-ascii.cc, ls-oct-ascii.h, mex.cc, mk-errno-list, oct-map.cc, oct-obj.h,
oct-parse.yy, octave-config.in.cc, ov-base-int.cc, ov-base-mat.cc, ov-base.cc,
ov-bool-mat.cc, ov-bool-sparse.cc, ov-bool.cc, ov-cell.cc, ov-class.cc,
ov-class.h, ov-cx-mat.cc, ov-cx-sparse.cc, ov-fcn-handle.cc, ov-flt-cx-mat.cc,
ov-flt-re-mat.cc, ov-intx.h, ov-range.h, ov-re-mat.cc, ov-re-sparse.cc,
ov-str-mat.cc, ov-struct.cc, ov-usr-fcn.h, ov.h, pr-output.cc, pt-id.cc,
pt-id.h, pt-mat.cc, pt-select.cc, sparse.cc, symtab.cc, symtab.h, syscalls.cc,
toplev.cc, txt-eng-ft.cc, variables.cc, zfstream.cc, zfstream.h, Dork.m,
getStash.m, myStash.m, Gork.m, Pork.m, myStash.m, getStash.m, myStash.m,
getStash.m, myStash.m, fntests.m: Use Octave coding convention for
cuddled parenthis in function calls with empty argument lists.
| author | Rik <octave@nomad.inbox5.com> |
|---|---|
| date | Sun, 08 Jul 2012 11:28:50 -0700 |
| parents | f3d52523cde1 |
| children | 5d3a684236b0 |
| rev | line source |
|---|---|
|
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1 ## Copyright (C) 2009-2012 Kai Habel |
| 11428 | 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} {@var{div} =} divergence (@var{x}, @var{y}, @var{z}, @var{fx}, @var{fy}, @var{fz}) |
| 11428 | 21 ## @deftypefnx {Function File} {@var{div} =} divergence (@var{fx}, @var{fy}, @var{fz}) |
| 22 ## @deftypefnx {Function File} {@var{div} =} divergence (@var{x}, @var{y}, @var{fx}, @var{fy}) | |
| 23 ## @deftypefnx {Function File} {@var{div} =} divergence (@var{fx}, @var{fy}) | |
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24 ## Calculate divergence of a vector field given by the arrays @var{fx}, |
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25 ## @var{fy}, and @var{fz} or @var{fx}, @var{fy} respectively. |
| 11428 | 26 ## @tex |
| 27 ## $$ | |
| 28 ## div F(x,y,z) = \partial_x{F} + \partial_y{F} + \partial_z{F} | |
| 29 ## $$ | |
| 30 ## @end tex | |
| 31 ## @ifnottex | |
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32 ## |
| 11428 | 33 ## @example |
| 34 ## @group | |
| 35 ## d d d | |
| 36 ## div F(x,y,z) = -- F(x,y,z) + -- F(x,y,z) + -- F(x,y,z) | |
| 37 ## dx dy dz | |
| 38 ## @end group | |
| 39 ## @end example | |
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40 ## |
| 11428 | 41 ## @end ifnottex |
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42 ## The coordinates of the vector field can be given by the arguments @var{x}, |
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43 ## @var{y}, @var{z} or @var{x}, @var{y} respectively. |
| 11428 | 44 ## |
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45 ## @seealso{curl, gradient, del2, dot} |
| 11428 | 46 ## @end deftypefn |
| 47 | |
| 48 ## Author: Kai Habel <kai.habel@gmx.de> | |
| 49 | |
| 50 function retval = divergence (varargin) | |
| 51 | |
| 52 fidx = 1; | |
| 53 if (nargin == 2) | |
| 54 sz = size (varargin{fidx}); | |
| 55 dx = (1:sz(2))(:); | |
| 56 dy = (1:sz(1))(:); | |
| 57 elseif (nargin == 3) | |
| 58 sz = size (varargin{fidx}); | |
| 59 dx = 1:sz(2); | |
| 60 dy = 1:sz(1); | |
| 61 dz = 1:sz(3); | |
| 62 elseif (nargin == 4) | |
| 63 fidx = 3; | |
| 64 dx = varargin{1}(1,:); | |
| 65 dy = varargin{2}(:,1); | |
| 66 elseif (nargin == 6) | |
| 67 fidx = 4; | |
| 68 dx = varargin{1}(1,:,1)(:); | |
| 69 dy = varargin{2}(:,1,1)(:); | |
| 70 dz = varargin{3}(1,1,:)(:); | |
| 71 else | |
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72 print_usage (); |
| 11428 | 73 endif |
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74 |
| 11428 | 75 if ((nargin == 4) || (nargin == 2)) |
| 76 if (!size_equal (varargin{fidx},varargin{fidx + 1})) | |
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77 error ("divergence: size of X and Y must match"); |
| 11428 | 78 elseif (ndims (varargin{fidx}) != 2) |
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79 error ("divergence: expected two-dimensional matrices X and Y"); |
| 11428 | 80 elseif ((length (dx) != columns (varargin{fidx})) || (length (dy) != rows (varargin{fidx}))) |
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81 error ("divergence: size of dx and dy must match the respective dimension of X and Y"); |
| 11428 | 82 endif |
| 83 | |
| 84 retval = gradient(varargin{fidx}, dx, dy); | |
| 85 retval += gradient(varargin{fidx + 1}.', dy, dx).'; | |
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86 |
| 11428 | 87 elseif ((nargin == 6) || (nargin == 3)) |
| 88 if (!size_equal (varargin{fidx},varargin{fidx + 1},varargin{fidx + 2})) | |
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89 error ("divergence: size of X, Y, and Z must match"); |
| 11428 | 90 elseif (ndims (varargin{fidx}) != 3) |
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91 error ("divergence: expected two-dimensional matrices X, Y, and Z"); |
| 11428 | 92 elseif ((length (dx) != size (varargin{fidx}, 2)) |
| 93 || (length (dy) != size (varargin{fidx}, 1)) | |
| 94 || (length (dz) != size (varargin{fidx}, 3))) | |
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parents:
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95 error ("divergence: size of dx, dy, and dz must match the respective dimesion of X, Y, and Z"); |
| 11428 | 96 endif |
| 97 | |
| 98 ## x-direction | |
| 99 retval = gradient (varargin{fidx}, dx, dy, dz); | |
| 100 ## y-direction | |
| 101 retval += shiftdim (gradient (shiftdim (varargin{fidx + 1}, 2), dy), 1); | |
| 102 ## z-direction | |
| 103 retval += shiftdim (gradient (shiftdim (varargin{fidx + 2}, 1), dz), 2); | |
| 104 endif | |
| 105 | |
| 106 endfunction | |
| 107 | |
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108 |
| 11428 | 109 %!test |
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110 %! [X,Y] = meshgrid (-20:20,-22:22); |
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111 %! div = divergence (X-Y,Y); |
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112 %! assert (all (div(:) == 2)); |
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113 %! assert (size_equal (X,Y,div)); |
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114 |