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.

## Copyright (C) 1996-2012 John W. Eaton
##
## 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
## <http://www.gnu.org/licenses/>.

## -*- texinfo -*-
## @deftypefn {Function File} {} surfc (@var{x}, @var{y}, @var{z})
## Plot a surface and contour given matrices @var{x}, and @var{y} from
## @code{meshgrid} and a matrix @var{z} corresponding to the @var{x} and
## @var{y} coordinates of the mesh.  If @var{x} and @var{y} are vectors,
## then a typical vertex is (@var{x}(j), @var{y}(i), @var{z}(i,j)).  Thus,
## columns of @var{z} correspond to different @var{x} values and rows of
## @var{z} correspond to different @var{y} values.
## @seealso{meshgrid, surf, contour}
## @end deftypefn

function h = surfc (varargin)

  newplot ();

  tmp = surface (varargin{:});

  ax = get (tmp, "parent");

  set (tmp, "facecolor", "flat");

  if (! ishold ())
    set (ax, "view", [-37.5, 30],
         "xgrid", "on", "ygrid", "on", "zgrid", "on");
  endif

  drawnow ();
  zmin = get (ax, "zlim")(1);

  # don't pass axis handle and/or string arguments to __contour__()
  stop_idx = nargin;
  for i = 2 : nargin
    if (ischar (varargin{i}))
      stop_idx = i - 1;
      break;
    endif
  endfor

  start_idx = 1;
  if (ishandle (varargin{1}))
    start_idx = 2;
  endif

  if (stop_idx - start_idx == 1 || stop_idx - start_idx == 3)
    #don't pass a color matrix c to __contour__
    stop_idx -= 1;
  endif

  [c, tmp2] = __contour__ (ax, zmin, varargin{start_idx:stop_idx});

  tmp = [tmp; tmp2];

  if (nargout > 0)
    h = tmp;
  endif

endfunction


%!demo
%! clf;
%! colormap ('default');
%! [~,~,Z] = peaks ();
%! surfc (Z);

%!demo
%! clf;
%! colormap ('default');
%! [~,~,Z] = sombrero ();
%! [Fx,Fy] = gradient (Z);
%! surfc (Z, Fx+Fy);
%! shading interp;

%!demo
%! clf;
%! colormap ('default');
%! [X,Y,Z] = sombrero ();
%! [~,Fy] = gradient (Z);
%! surfc (X,Y,Z,Fy);
%! shading interp;