update packages

[CreaPhase.git] / octave_packages / m / plot / semilogx.m

diff --git a/octave_packages/m/plot/semilogx.m b/octave_packages/m/plot/semilogx.m
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+## Copyright (C) 1993-2012 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} {} semilogx (@var{y})
+## @deftypefnx {Function File} {} semilogx (@var{x}, @var{y})
+## @deftypefnx {Function File} {} semilogx (@var{x}, @var{y}, @var{property}, @var{value}, @dots{})
+## @deftypefnx {Function File} {} semilogx (@var{x}, @var{y}, @var{fmt})
+## @deftypefnx {Function File} {} semilogx (@var{h}, @dots{})
+## @deftypefnx {Function File} {@var{h} =} semilogx (@dots{})
+## Produce a two-dimensional plot using a logarithmic scale for the @var{x}
+## axis.  See the documentation of @code{plot} for a description of the
+## arguments that @code{semilogx} will accept.
+## 
+## The optional return value @var{h} is a graphics handle to the created plot.
+## @seealso{plot, semilogy, loglog}
+## @end deftypefn
+
+## Author: jwe
+
+function retval = semilogx (varargin)
+
+  [h, varargin, nargs] = __plt_get_axis_arg__ ("semilogx", varargin{:});
+
+  if (nargs < 1)
+    print_usage();
+  endif
+
+  oldh = gca ();
+  unwind_protect
+    axes (h);
+    newplot ();
+
+    set (h, "xscale", "log");
+    if (any( strcmp (get (gca, "nextplot"), {"new", "replace"})))
+      set (h, "xminortick", "on");
+    endif
+
+    tmp = __plt__ ("semilogx", h, varargin{:});
+
+    if (nargout > 0)
+      retval = tmp;
+    endif
+  unwind_protect_cleanup
+    axes (oldh);
+  end_unwind_protect
+
+endfunction
+
+
+%!demo
+%! clf ();
+%! x = 1:0.01:10;
+%! y = (x .* (1 + rand (size (x)))) .^ 2;
+%! semilogx (y, x);
+
+%!demo
+%! clf ();
+%! x = logspace (-5, 1, 10);
+%! y = logspace (-5, 1, 10);
+%!
+%! subplot (1, 2, 1);
+%! semilogx (x, y);
+%! xlabel ("semilogx (x, y)");
+%!
+%! subplot (1, 2, 2);
+%! semilogx (-x, y);
+%! xlabel ("semilogx (-x, y)");
+
+%!demo
+%! clf ();
+%! x = logspace (-5, 1, 10);
+%! y = logspace (-5, 1, 10);
+%!
+%! subplot (1, 2, 1);
+%! semilogx (x, y);
+%! set (gca, "xdir", "reverse", "activepositionproperty", "outerposition")
+%! xlabel ({"semilogx (x, y)", "xdir = reversed"})
+%!
+%! subplot (1, 2, 2);
+%! semilogx (-x, y);
+%! set (gca, "xdir", "reverse", "activepositionproperty", "outerposition");
+%! xlabel ({"semilogx (-x, y)", "xdir = reversed"});
+
+%!test
+%! hf = figure ("visible", "off");
+%! unwind_protect
+%!   a = logspace (-5, 1, 10);
+%!   b = logspace (-5, 1, 10);
+%!   semilogx (a, b)
+%!   assert (get (gca, "xscale"), "log");
+%!   assert (get (gca, "yscale"), "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);
+%!   semilogx (a, b);
+%!   axis tight;
+%!   assert (all (get (gca, "xtick") < 0));
+%! unwind_protect_cleanup
+%!   close (hf);
+%! end_unwind_protect
+