/usr/share/octave/packages/control-2.6.2/__axis_limits__.m is in octave-control 2.6.2-1build1.
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## Auburn University. All rights reserved.
##
##
## This program 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.
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## This program 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 this program; see the file COPYING. If not, see
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## -*- texinfo -*-
## @deftypefn {Function File} {} __axis_limits__ (@var{axdata})
## Determine axis limits for 2-D data (column vectors); leaves a 10%
## margin around the plots.
## Inserts margins of +/- 0.1 if data is one-dimensional
## (or a single point).
##
## @strong{Input}
## @table @var
## @item axdata
## @var{n} by 2 matrix of data [@var{x}, @var{y}].
## @end table
##
## @strong{Output}
## @table @var
## @item axvec
## Vector of axis limits appropriate for call to @command{axis} function.
## @end table
## @end deftypefn
function axvec = __axis_limits__ (axdata)
if (nargin < 1 || isempty (axdata))
axdata = 0;
endif
## compute axis limits
minv = min (axdata);
maxv = max (axdata);
delv = (maxv-minv)/2; # breadth of the plot
midv = (minv + maxv)/2; # midpoint of the plot
axmid = [midv(1), midv(1), midv(2), midv(2)];
axdel = [-0.1, 0.1, -0.1, 0.1]; # default plot width (if less than 2-d data)
if (max (delv) == 0)
if (midv(1) != 0)
axdel(1:2) = [-0.1*midv(1), 0.1*midv(1)];
endif
if (midv(2) != 0)
axdel(3:4) = [-0.1*midv(2), 0.1*midv(2)];
endif
else
## they're at least one-dimensional
tolv = max(1e-8, 1e-8*abs(midv));
if (abs (delv(1)) >= tolv(1))
axdel(1:2) = 1.1*[-delv(1),delv(1)];
endif
if (abs (delv(2)) >= tolv(2))
axdel(3:4) = 1.1*[-delv(2),delv(2)];
endif
endif
axvec = axmid + axdel;
endfunction
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