1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
|
########################################################################
##
## Copyright (C) 1993-2024 The Octave Project Developers
##
## See the file COPYRIGHT.md in the top-level directory of this
## distribution or <https://octave.org/copyright/>.
##
## 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
## <https://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 axes,
## 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
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", "positionconstraint", "outerposition");
%! title ({"semilogy (x, y)", "ydir = reversed"});
%!
%! subplot (2,1,2);
%! semilogy (x, -y);
%! set (gca, "ydir", "reverse", "positionconstraint", "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
|
