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## Copyright (C) 1996 John W. Eaton
##
## 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, 59 Temple Place - Suite 330, Boston, MA
## 02111-1307, USA.
## usage: [xb, yb] = bar (x, y)
##
## Given two vectors of x-y data, bar produces a `bar' graph.
##
## If only one argument is given, it is taken as a vector of y-values
## and the x coordinates are taken to be the indices of the elements.
##
## If two output arguments are specified, the data are generated but
## not plotted. For example,
##
## bar (x, y);
##
## and
##
## [xb, yb] = bar (x, y);
## plot (xb, yb);
##
## are equivalent.
##
## See also: plot, semilogx, semilogy, loglog, polar, mesh, contour,
## stairs, gplot, gsplot, replot, xlabel, ylabel, title
## Author: jwe
function [xb, yb] = bar (x, y)
if (nargin == 1)
if (is_vector (x))
len = 3 * length (x) + 1;
tmp_xb = tmp_yb = zeros (len, 1);
tmp_xb(1) = 0.5;
tmp_yb(1) = 0;
k = 1;
for i = 2:3:len
tmp_xb(i) = k-0.5;
tmp_xb(i+1) = k+0.5;
tmp_xb(i+2) = k+0.5;
tmp_yb(i) = x(k);
tmp_yb(i+1) = x(k);
tmp_yb(i+2) = 0.0;
k++;
endfor
else
error ("bar: argument must be a vector");
endif
elseif (nargin == 2)
if (is_vector (x) && is_vector (y))
xlen = length (x);
ylen = length (y);
if (xlen == ylen)
len = 3 * xlen + 1;
tmp_xb = tmp_yb = zeros (len, 1);
cutoff = zeros (1, xlen-1);
for i = 1:xlen-1
cutoff(i) = (x(i) + x(i+1)) / 2.0;
endfor
delta_p = cutoff(1) - x(1);
delta_m = delta_p;
tmp_xb(1) = x(1) - delta_m;
tmp_yb(1) = 0.0;
k = 1;
for i = 2:3:len
tmp_xb(i) = tmp_xb(i-1);
tmp_xb(i+1) = x(k) + delta_p;
tmp_xb(i+2) = tmp_xb(i+1);
tmp_yb(i) = y(k);
tmp_yb(i+1) = y(k);
tmp_yb(i+2) = 0.0;
if (k < xlen)
if (x(k+1) < x(k))
error ("bar: x vector values must be in ascending order");
endif
delta_m = x(k+1) - cutoff(k);
k++;
if (k < xlen)
delta_p = cutoff(k) - x(k);
else
delta_p = delta_m;
endif
endif
endfor
else
error ("bar: arguments must be the same length");
endif
else
error ("bar: arguments must be vectors");
endif
else
usage ("[xb, yb] = bar (x, y)");
endif
if (nargout == 0)
plot (tmp_xb, tmp_yb);
else
xb = tmp_xb;
yb = tmp_yb;
endif
endfunction
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