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--- supp:octave:contrib:arrow:start [2016/04/10 19:55] – admin
+++ supp:octave:contrib:arrow:start [2016/04/10 19:59] – [Arrow Vector] admin
@@ Line 1: / Line 1: @@
-====== Arrow ======
+====== Draw Vector Arrows ======
-Draw vector arrows.
 ===== arrow.m =====
+Draw vector arrow.
 <file octave arrow.m>
@@ Line 130: / Line 132: @@
 </file>
+===== turn.m =====
+Rotate three vectors by means of rotation matrix.
+<file octave turn.m>
+## Copyright (C) 2011 rolf.becker
+##
+## 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.
+##
+## You should have received a copy of the GNU General Public License
+## along with Octave; see the file COPYING.  If not, see
+## <http://www.gnu.org/licenses/>.
+## turn
+## Author: rolf.becker <rolf.becker@NB-RB>
+## Created: 2011-04-04
+function [ ret ] = turn ()
+	scl = 0.4;
+	lw  = 3;
+	sty = 2;
+	n   = 16;
+	Z  = [0 0]';
+	P1 = [2 0]';
+	P2 = [0 1]';
+	M  = 2*[1 1]';
+	phi=2*pi/n;
+	R=( [cos(phi) -sin(phi) ; sin(phi) cos(phi)] );
+	for i=0:n
+		arrow(Z,M,scl,sty,lw)
+		hold on
+		arrow(M,M+P1,scl,sty,lw)
+		arrow(M,M+P2,scl,sty,lw)
+		hold off
+		grid on
+		axis([-5 5 -5 5])
+		set(gca,"fontsize",24,"xtick",-5:5,"ytick",-5:5)
+		axis equal
+		axis square
+%		title("Rotating Vectors");
+		xlabel("x");
+		ylabel("y");
+		M=R*M;
+		P1=R*P1;
+		P2=R*P2;
+		sleep(0.001);
+	endfor
+endfunction
+</file>