Mercurial > octave-nkf
diff scripts/plot/draw/contourc.m @ 17572:7bb76a22cde1
maint: Split scripts/plot directory into 4 pieces.
scripts/gui : user-interface functions
scripts/plot/appearance : functions controlling plot appearance
scripts/plot/draw : plotting functions which produce graphs
scripts/plot/util : low-level plotting functions and utilities.
* scripts/gui/guidata.m, scripts/gui/guihandles.m, scripts/gui/module.mk,
scripts/gui/private/__file_filter__.m,
scripts/gui/private/__fltk_file_filter__.m,
scripts/gui/private/__is_function__.m, scripts/gui/private/__uigetdir_fltk__.m,
scripts/gui/private/__uigetfile_fltk__.m,
scripts/gui/private/__uiobject_split_args__.m,
scripts/gui/private/__uiputfile_fltk__.m, scripts/gui/uicontextmenu.m,
scripts/gui/uicontrol.m, scripts/gui/uigetdir.m, scripts/gui/uigetfile.m,
scripts/gui/uimenu.m, scripts/gui/uipanel.m, scripts/gui/uipushtool.m,
scripts/gui/uiputfile.m, scripts/gui/uiresume.m, scripts/gui/uitoggletool.m,
scripts/gui/uitoolbar.m, scripts/gui/uiwait.m, scripts/gui/waitbar.m,
scripts/gui/waitforbuttonpress.m: Moved from scripts/plot to scripts/gui
* scripts/plot/appearance/__clabel__.m,
scripts/plot/appearance/__getlegenddata__.m, scripts/plot/appearance/axis.m,
scripts/plot/appearance/box.m, scripts/plot/appearance/caxis.m,
scripts/plot/appearance/clabel.m, scripts/plot/appearance/daspect.m,
scripts/plot/appearance/diffuse.m, scripts/plot/appearance/grid.m,
scripts/plot/appearance/gtext.m, scripts/plot/appearance/hidden.m,
scripts/plot/appearance/legend.m,
scripts/plot/appearance/orient.m, scripts/plot/appearance/pbaspect.m,
scripts/plot/appearance/private/__axis_label__.m,
scripts/plot/appearance/private/__axis_limits__.m,
scripts/plot/appearance/shading.m, scripts/plot/appearance/specular.m,
scripts/plot/appearance/text.m, scripts/plot/appearance/title.m,
scripts/plot/appearance/view.m, scripts/plot/appearance/whitebg.m,
scripts/plot/appearance/xlabel.m, scripts/plot/appearance/xlim.m,
scripts/plot/appearance/ylabel.m, scripts/plot/appearance/ylim.m,
scripts/plot/appearance/zlabel.m, scripts/plot/appearance/zlim.m:
Moved from scripts/plot to subdir appearance.
* scripts/plot/draw/area.m, scripts/plot/draw/bar.m, scripts/plot/draw/barh.m,
scripts/plot/draw/colorbar.m, scripts/plot/draw/comet.m,
scripts/plot/draw/comet3.m, scripts/plot/draw/compass.m,
scripts/plot/draw/contour.m, scripts/plot/draw/contour3.m,
scripts/plot/draw/contourc.m, scripts/plot/draw/contourf.m,
scripts/plot/draw/cylinder.m, scripts/plot/draw/ellipsoid.m,
scripts/plot/draw/errorbar.m, scripts/plot/draw/ezcontour.m,
scripts/plot/draw/ezcontourf.m, scripts/plot/draw/ezmesh.m,
scripts/plot/draw/ezmeshc.m, scripts/plot/draw/ezplot.m,
scripts/plot/draw/ezplot3.m, scripts/plot/draw/ezpolar.m,
scripts/plot/draw/ezsurf.m, scripts/plot/draw/ezsurfc.m,
scripts/plot/draw/feather.m, scripts/plot/draw/fill.m,
scripts/plot/draw/fplot.m, scripts/plot/draw/hist.m,
scripts/plot/draw/isocolors.m, scripts/plot/draw/isonormals.m,
scripts/plot/draw/isosurface.m, scripts/plot/draw/line.m,
scripts/plot/draw/loglog.m, scripts/plot/draw/loglogerr.m,
scripts/plot/draw/mesh.m, scripts/plot/draw/meshc.m, scripts/plot/draw/meshz.m,
scripts/plot/draw/pareto.m,
scripts/plot/draw/patch.m, scripts/plot/draw/pcolor.m,
scripts/plot/draw/peaks.m, scripts/plot/draw/pie.m, scripts/plot/draw/pie3.m,
scripts/plot/draw/plot.m, scripts/plot/draw/plot3.m,
scripts/plot/draw/plotmatrix.m, scripts/plot/draw/plotyy.m,
scripts/plot/draw/polar.m, scripts/plot/draw/private/__add_datasource__.m,
scripts/plot/draw/private/__bar__.m, scripts/plot/draw/private/__contour__.m,
scripts/plot/draw/private/__errcomm__.m,
scripts/plot/draw/private/__errplot__.m,
scripts/plot/draw/private/__ezplot__.m,
scripts/plot/draw/private/__interp_cube__.m,
scripts/plot/draw/private/__line__.m,
scripts/plot/draw/private/__marching_cube__.m,
scripts/plot/draw/private/__patch__.m, scripts/plot/draw/private/__pie__.m,
scripts/plot/draw/private/__plt__.m, scripts/plot/draw/private/__quiver__.m,
scripts/plot/draw/private/__scatter__.m, scripts/plot/draw/private/__stem__.m,
scripts/plot/draw/quiver.m, scripts/plot/draw/quiver3.m,
scripts/plot/draw/rectangle.m, scripts/plot/draw/ribbon.m,
scripts/plot/draw/rose.m, scripts/plot/draw/scatter.m,
scripts/plot/draw/scatter3.m, scripts/plot/draw/semilogx.m,
scripts/plot/draw/semilogxerr.m, scripts/plot/draw/semilogy.m,
scripts/plot/draw/semilogyerr.m, scripts/plot/draw/shrinkfaces.m,
scripts/plot/draw/slice.m, scripts/plot/draw/sombrero.m,
scripts/plot/draw/sphere.m, scripts/plot/draw/stairs.m,
scripts/plot/draw/stem.m, scripts/plot/draw/stem3.m,
scripts/plot/draw/stemleaf.m, scripts/plot/draw/surf.m,
scripts/plot/draw/surface.m, scripts/plot/draw/surfc.m,
scripts/plot/draw/surfl.m, scripts/plot/draw/surfnorm.m,
scripts/plot/draw/tetramesh.m, scripts/plot/draw/trimesh.m,
scripts/plot/draw/triplot.m, scripts/plot/draw/trisurf.m,
scripts/plot/draw/waterfall.m: Moved from plot/ to subdir draw.
* scripts/plot/util/__actual_axis_position__.m,
scripts/plot/util/__default_plot_options__.m,
scripts/plot/util/__gnuplot_drawnow__.m,
scripts/plot/util/__next_line_color__.m,
scripts/plot/util/__next_line_style__.m,
scripts/plot/util/__plt_get_axis_arg__.m, scripts/plot/util/__pltopt__.m,
scripts/plot/util/allchild.m, scripts/plot/util/ancestor.m,
scripts/plot/util/axes.m, scripts/plot/util/cla.m, scripts/plot/util/clf.m,
scripts/plot/util/close.m, scripts/plot/util/closereq.m,
scripts/plot/util/colstyle.m, scripts/plot/util/copyobj.m,
scripts/plot/util/figure.m, scripts/plot/util/findall.m,
scripts/plot/util/findfigs.m, scripts/plot/util/findobj.m,
scripts/plot/util/gca.m, scripts/plot/util/gcbf.m, scripts/plot/util/gcbo.m,
scripts/plot/util/gcf.m, scripts/plot/util/gco.m, scripts/plot/util/ginput.m,
scripts/plot/util/gnuplot_binary.in, scripts/plot/util/graphics_toolkit.m,
scripts/plot/util/hdl2struct.m, scripts/plot/util/hggroup.m,
scripts/plot/util/hold.m, scripts/plot/util/isaxes.m,
scripts/plot/util/isfigure.m, scripts/plot/util/ishghandle.m,
scripts/plot/util/ishold.m, scripts/plot/util/isprop.m,
scripts/plot/util/linkprop.m, scripts/plot/util/meshgrid.m,
scripts/plot/util/ndgrid.m,
scripts/plot/util/newplot.m, scripts/plot/util/print.m,
scripts/plot/util/printd.m, scripts/plot/util/private/__add_default_menu__.m,
scripts/plot/util/private/__fltk_ginput__.m,
scripts/plot/util/private/__fltk_print__.m,
scripts/plot/util/private/__ghostscript__.m,
scripts/plot/util/private/__gnuplot_get_var__.m,
scripts/plot/util/private/__gnuplot_ginput__.m,
scripts/plot/util/private/__gnuplot_has_feature__.m,
scripts/plot/util/private/__gnuplot_has_terminal__.m,
scripts/plot/util/private/__gnuplot_open_stream__.m,
scripts/plot/util/private/__gnuplot_print__.m,
scripts/plot/util/private/__gnuplot_version__.m,
scripts/plot/util/private/__go_draw_axes__.m,
scripts/plot/util/private/__go_draw_figure__.m,
scripts/plot/util/private/__print_parse_opts__.m,
scripts/plot/util/private/__tight_eps_bbox__.m, scripts/plot/util/refresh.m,
scripts/plot/util/refreshdata.m, scripts/plot/util/saveas.m,
scripts/plot/util/shg.m, scripts/plot/util/struct2hdl.m,
scripts/plot/util/subplot.m: Moved from plot to subdir util.
* etc/HACKING: Updated directory structure info.
* scripts/Makefile.am, scripts/plot/appearance/module.mk,
scripts/plot/draw/module.mk, scripts/plot/util/module.mk:
Added new directories to build system.
author | Rik <rik@octave.org> |
---|---|
date | Fri, 04 Oct 2013 17:09:08 -0700 |
parents | scripts/plot/contourc.m@56e72e8d1aba |
children | d63878346099 |
line wrap: on
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/scripts/plot/draw/contourc.m Fri Oct 04 17:09:08 2013 -0700 @@ -0,0 +1,171 @@ +## Copyright (C) 2003-2012 Shai Ayal +## +## 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} {[@var{c}, @var{lev}] =} contourc (@var{z}) +## @deftypefnx {Function File} {[@var{c}, @var{lev}] =} contourc (@var{z}, @var{vn}) +## @deftypefnx {Function File} {[@var{c}, @var{lev}] =} contourc (@var{x}, @var{y}, @var{z}) +## @deftypefnx {Function File} {[@var{c}, @var{lev}] =} contourc (@var{x}, @var{y}, @var{z}, @var{vn}) +## Compute contour lines (isolines of constant Z value). +## +## The matrix @var{z} contains height values above the rectangular grid +## determined by @var{x} and @var{y}. If only a single input @var{z} is +## provided then @var{x} is taken to be @code{1:rows (@var{z})} and @var{y} is +## taken to be @code{1:columns (@var{z})}. +## +## The optional input @var{vn} is either a scalar denoting the number of +## contour lines to compute or a vector containing the Z values where lines +## will be computed. When @var{vn} is a vector the number of contour lines +## is @code{numel (@var{vn})}. However, to compute a single contour line +## at a given value use @code{@var{vn} = [val, val]}. If @var{vn} is omitted +## it defaults to 10. +## +## The return value @var{c} is a 2x@var{n} matrix containing the +## contour lines in the following format +## +## @example +## @group +## @var{c} = [lev1, x1, x2, @dots{}, levn, x1, x2, ... +## len1, y1, y2, @dots{}, lenn, y1, y2, @dots{}] +## @end group +## @end example +## +## @noindent +## in which contour line @var{n} has a level (height) of @var{levn} and +## length of @var{lenn}. +## +## The optional return value @var{lev} is a vector with the Z values of +## of the contour levels. +## +## Example: +## +## @example +## @group +## x = 0:2; +## y = x; +## z = x' * y; +## contourc (x, y, z, 2:3) +## @result{} 2.0000 2.0000 1.0000 3.0000 1.5000 2.0000 +## 2.0000 1.0000 2.0000 2.0000 2.0000 1.5000 +## @end group +## @end example +## @seealso{contour, contourf, contour3, clabel} +## @end deftypefn + +## Author: Shai Ayal <shaiay@users.sourceforge.net> + +function [c, lev] = contourc (varargin) + + if (nargin < 1 || nargin > 4) + print_usage (); + endif + + if (nargin == 1) + z = varargin{1}; + x = 1:columns (z); + y = 1:rows (z); + vn = 10; + elseif (nargin == 2) + z = varargin{1}; + x = 1:columns (z); + y = 1:rows (z); + vn = varargin{2}; + elseif (nargin == 3) + x = varargin{1}; + y = varargin{2}; + z = varargin{3}; + vn = 10; + elseif (nargin == 4) + x = varargin{1}; + y = varargin{2}; + z = varargin{3}; + vn = varargin{4}; + endif + + if (! ismatrix (z) || ! ismatrix (x) || ! ismatrix (y)) + error ("contourc: X, Y, and Z must be matrices"); + endif + + if (isscalar (vn)) + vv = linspace (min (z(:)), max (z(:)), vn+2)(2:end-1); + else + vv = unique (sort (vn)); + endif + + if (isvector (x) && isvector (y)) + cdat = __contourc__ (x(:)', y(:)', z, vv); + elseif (! any (bsxfun (@minus, x, x(1,:))(:)) + && ! any (bsxfun (@minus, y, y(:,1))(:))) + ## x,y are uniform grid (such as from meshgrid) + cdat = __contourc__ (x(1,:), y(:,1)', z, vv); + else + ## Data is sampled over non-uniform mesh. + ## Algorithm calculates contours for uniform grid + ## and then interpolates values back to the non-uniform mesh. + + ## Uniform grid for __contourc__. + [nr, nc] = size (z); + ii = 1:nc; + jj = 1:nr; + + cdat = __contourc__ (ii, jj, z, vv); + + ## Map the contour lines from index space (i,j) + ## back to the original grid (x,y) + i = 1; + + while (i < columns (cdat)) + clen = cdat(2, i); + idx = i + (1:clen); + + ci = cdat(1, idx); + cj = cdat(2, idx); + + ## Due to rounding errors, some elements of ci and cj + ## can fall out of the range of ii and jj and + ## interp2 would return NA for those values. + ## The permitted range is enforced here: + + ci = max (ci, 1); ci = min (ci, nc); + cj = max (cj, 1); cj = min (cj, nr); + + cdat(1, idx) = interp2 (ii, jj, x, ci, cj); + cdat(2, idx) = interp2 (ii, jj, y, ci, cj); + + i += clen + 1; + endwhile + endif + + if (nargout > 0) + c = cdat; + lev = vv; + endif + +endfunction + + +%!test +%! x = 0:2; +%! y = x; +%! z = x' * y; +%! c_exp = [2, 1, 1, 2, 2, 3, 1.5, 2; 4, 2, 2, 1, 1, 2, 2, 1.5]; +%! lev_exp = [2 3]; +%! [c_obs, lev_obs] = contourc (x, y, z, 2:3); +%! assert (c_obs, c_exp, eps); +%! assert (lev_obs, lev_exp, eps); +