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ax2dlim.m
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1999-04-29
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# Copyright (C) 1998 A. Scottedward Hodel
#
# 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 2, 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, write to the Free
# Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
function axvec = ax2dlim(axdata)
# function axvec = ax2dlim(axdata)
# determine axis limits for 2-d data; leaves a 10% margin around the plots.
# puts in margins of +/- 0.1 if data is one dimensional (or a single point)
# inputs:
# axdata: nx2 matrix of data [x,y]
# outputs:
# vector of axis limits appropriate for call to axis() function
if(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
if(delv(1) != 0)
axdel(1:2) = 1.1*[-delv(1),delv(1)];
endif
if(delv(2) != 0)
axdel(3:4) = 1.1*[-delv(2),delv(2)];
endif
endif
axvec = axmid + axdel;
endfunction