Mercurial > octave
view scripts/plot/draw/semilogy.m @ 23219:3ac9f9ecfae5 stable
maint: Update copyright dates.
author | John W. Eaton <jwe@octave.org> |
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date | Wed, 22 Feb 2017 12:39:29 -0500 |
parents | e9a0469dedd9 |
children | 092078913d54 0c6cedafc71e |
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## Copyright (C) 1993-2017 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 {} {} semilogy (@var{y}) ## @deftypefnx {} {} semilogy (@var{x}, @var{y}) ## @deftypefnx {} {} semilogy (@var{x}, @var{y}, @var{property}, @var{value}, @dots{}) ## @deftypefnx {} {} semilogy (@var{x}, @var{y}, @var{fmt}) ## @deftypefnx {} {} semilogy (@var{h}, @dots{}) ## @deftypefnx {} {@var{h} =} semilogy (@dots{}) ## Produce a 2-D plot using a logarithmic scale for the y-axis. ## ## See the documentation of @code{plot} for a description of the ## arguments that @code{semilogy} will accept. ## ## If the first argument @var{hax} is an axes handle, then plot into this axis, ## rather than the current axes returned by @code{gca}. ## ## The optional return value @var{h} is a graphics handle to the created plot. ## @seealso{plot, semilogx, loglog} ## @end deftypefn ## Author: jwe function h = semilogy (varargin) [hax, varargin, nargs] = __plt_get_axis_arg__ ("semilogy", varargin{:}); if (nargs < 1) print_usage (); endif oldfig = []; if (! isempty (hax)) oldfig = get (0, "currentfigure"); endif unwind_protect hax = newplot (hax); set (hax, "yscale", "log"); if (! ishold ()) set (hax, "yminortick", "on", "box", "on"); endif htmp = __plt__ ("semilogy", hax, varargin{:}); unwind_protect_cleanup if (! isempty (oldfig)) set (0, "currentfigure", oldfig); endif end_unwind_protect if (nargout > 0) h = htmp; endif endfunction %!demo %! clf; %! x = 1:0.01:10; %! y = (x .* (1 + rand (size (x)))) .^ 2; %! semilogy (x, y); %! title ({"semilogx() plot", "Y-axis is logarithmic"}); %!demo %! clf; %! x = logspace (-5, 1, 10); %! y = logspace (-5, 1, 10); %! %! subplot (2,1,1); %! semilogy (x, y); %! title ("semilogy (x, y)"); %! %! subplot (2,1,2); %! semilogy (x, -y); %! title ("semilogy (x, -y)"); %!demo %! clf; %! x = logspace (-5, 1, 10); %! y = logspace (-5, 1, 10); %! %! subplot (2,1,1); %! semilogy (x, y); %! set (gca, "ydir", "reverse", "activepositionproperty", "outerposition"); %! title ({"semilogy (x, y)", "ydir = reversed"}); %! %! subplot (2,1,2); %! semilogy (x, -y); %! set (gca, "ydir", "reverse", "activepositionproperty", "outerposition"); %! title ({"semilogy (x, -y)", "ydir = reversed"}); %!test %! hf = figure ("visible", "off"); %! unwind_protect %! a = logspace (-5, 1, 10); %! b = logspace (-5, 1, 10); %! semilogy (a, b); %! assert (get (gca, "yscale"), "log"); %! assert (get (gca, "xscale"), "linear"); %! unwind_protect_cleanup %! close (hf); %! end_unwind_protect %!test %! hf = figure ("visible", "off"); %! unwind_protect %! a = logspace (-5, 1, 10); %! b =-logspace (-5, 1, 10); %! semilogy (a, b); %! axis tight; %! assert (all (get (gca, "ytick") < 0)); %! unwind_protect_cleanup %! close (hf); %! end_unwind_protect