1## Copyright (C) 1998, 2000, 2004, 2005, 2007 2## Auburn University. All rights reserved. 3## 4## 5## This program is free software; you can redistribute it and/or modify it 6## under the terms of the GNU General Public License as published by 7## the Free Software Foundation; either version 3 of the License, or (at 8## your option) any later version. 9## 10## This program is distributed in the hope that it will be useful, but 11## WITHOUT ANY WARRANTY; without even the implied warranty of 12## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13## General Public License for more details. 14## 15## You should have received a copy of the GNU General Public License 16## along with this program; see the file COPYING. If not, see 17## <http://www.gnu.org/licenses/>. 18 19## -*- texinfo -*- 20## @deftypefn {Function File} {} __axis_limits__ (@var{axdata}) 21## Determine axis limits for 2-D data (column vectors); leaves a 10% 22## margin around the plots. 23## Inserts margins of +/- 0.1 if data is one-dimensional 24## (or a single point). 25## 26## @strong{Input} 27## @table @var 28## @item axdata 29## @var{n} by 2 matrix of data [@var{x}, @var{y}]. 30## @end table 31## 32## @strong{Output} 33## @table @var 34## @item axvec 35## Vector of axis limits appropriate for call to @command{axis} function. 36## @end table 37## @end deftypefn 38 39function axvec = __axis_limits__ (axdata) 40 41 if (nargin < 1 || isempty (axdata)) 42 axdata = 0; 43 endif 44 45 ## compute axis limits 46 minv = min (axdata); 47 maxv = max (axdata); 48 delv = (maxv-minv)/2; # breadth of the plot 49 midv = (minv + maxv)/2; # midpoint of the plot 50 axmid = [midv(1), midv(1), midv(2), midv(2)]; 51 axdel = [-0.1, 0.1, -0.1, 0.1]; # default plot width (if less than 2-d data) 52 if (max (delv) == 0) 53 if (midv(1) != 0) 54 axdel(1:2) = [-0.1*midv(1), 0.1*midv(1)]; 55 endif 56 if (midv(2) != 0) 57 axdel(3:4) = [-0.1*midv(2), 0.1*midv(2)]; 58 endif 59 else 60 ## they're at least one-dimensional 61 tolv = max(1e-8, 1e-8*abs(midv)); 62 if (abs (delv(1)) >= tolv(1)) 63 axdel(1:2) = 1.1*[-delv(1),delv(1)]; 64 endif 65 if (abs (delv(2)) >= tolv(2)) 66 axdel(3:4) = 1.1*[-delv(2),delv(2)]; 67 endif 68 endif 69 axvec = axmid + axdel; 70 71endfunction 72