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## Copyright (C) 1998-2003 Joao Cardoso.
##
## 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 2 of the License, or (at your
## option) any later version.
##
## 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.
##
## This file is part of plplot_octave.
## arrows( X, Y, dx, dy)
## plot an array of arrows (partly emulates matlab quiver)
function arrows( X, Y, dx, dy)
__pl_init;
if(0)
of = do_fortran_indexing; do_fortran_indexing = 1;
for i = 1:rows(X)*columns(X)
xx = [X(i); X(i) + dx(i)];
yy = [Y(i); Y(i) + dy(i)];
plline(xx,yy); plpoin(X(i) + dx(i), Y(i) + dy(i), 20);
endfor
plflush; pleop;
do_fortran_indexing = of;
else
for i = 1:columns(X)
plarrows(dx(:,i), dy(:,i), X(:,i), Y(:,i), 1, 1, 1);
endfor
endif
endfunction
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