/usr/share/octave/packages/control-2.6.2/__axis_margin__.m is in octave-control 2.6.2-1build1.
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## Auburn University. All rights reserved.
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## -*- texinfo -*-
## @deftypefn {Function File} {} __axis_margin__ (@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_margin__ (axdata)
## compute axis limits
minv = axdata(1);
maxv = axdata(2);
delv = (maxv-minv)/2; # breadth of the plot
midv = (minv + maxv)/2; # midpoint of the plot
axmid = [midv, midv];
axdel = [-0.1, 0.1]; # default plot width (if less than 2-d data)
if (delv == 0)
if (midv != 0)
axdel = [-0.1*midv, 0.1*midv];
endif
else
## they're at least one-dimensional
tolv = max(1e-8, 1e-8*abs(midv));
if (abs (delv) >= tolv)
axdel = 1.1*[-delv,delv];
endif
endif
axvec = axmid + axdel;
endfunction
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