function []=prob_7_1_27()
%
% Written by:
% -- 
% John L. Weatherwax                2006-11-21
% 
% email: wax@alum.mit.edu
% 
% Please send comments and especially bug reports to the
% above email address.
% 
%-----
  
clc; close all; 

A = [ 2 1; 1 2 ]; 
A = [ 2 2; 2 2 ]; 
A = [ 2 -1; 4 2 ]; 
theta = [ 0:2*pi/50:2*pi ]; 
circle = [cos(theta); sin(theta)];
ellipse = A * circle; 

figure; axis( [ -4 4 -4 4 ] ); axis( 'square' );
plot( circle(1,:), circle(2,:), ellipse(1,:), ellipse(2,:) );